1122247 SzGeCERN 20241025034338.0 oai:cds.cern.ch:1122247 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN SLAC 7899114 SPIRES 7899114 Inspire 795319 CERN-AB-2008-007 eng CERN Library CLIC-Note-0754 CERN Library AB-2008-007 CLIC-Note-754 Tomás, R CERN Measurement of Resonance driving terms in the ATF Damping Ring 2008 Geneva CERN 27 Aug 2008 4 p The measurement of resonance driving terms in the Damping Ring of the Accelerator Test Facility in KEK could help finding possible machine imperfections and even to optimize single particle stability through the minimization of non-linearities. The first experimental attempts of this enterprise are reported in this note. CC-BY publication JACoW OA CLIC-Note CERN EDS CERN-AB SIS EPAC2008 CLAS1 CLICARCHIVE SzGeCERN Accelerators and Storage Rings CERN ARTICLE KEK ATF ATF CLIC Not applicable Kubo, K KEK Japan Kuroda, S KEK Japan Naito, T KEK Japan Okugi, T KEK Japan Urakawa, J KEK Japan Zimmermann, F CERN AUTHOR|(CDS)2067941 #BEARD# AB ABP https://accelconf.web.cern.ch/e08/papers/thpc073.pdf Published version from JACoW 18228 223895 http://cds.cern.ch/record/1122247/files/CERN-AB-2008-007_2.pdf 18222 223895 http://cds.cern.ch/record/1122247/files/CERN-AB-2008-007.pdf Preprint tjitske.kehrer@cern.ch n 200835 a2008 13 20100803 1411 CER01 20080827 1048205 THPC073 genoa20080623 PUBLIC 000700455CER CLINOT ARTICLE ConferencePaper 1122256 SzGeCERN 20240223164043.0 oai:cds.cern.ch:1122256 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN SPIRES 7894899 Inspire 794899 CERN-AB-2008-008 eng CERN Library AB-2008-008 Métral, E CERN CERN SPS Impedance in 2007 2008 Geneva CERN 27 Aug 2008 4 p Each year several measurements of the beam coupling impedance are performed in both longitudinal and transverse planes of the CERN Super Proton Synchrotron to keep track of its evolution. In parallel, after the extensive and successful campaign of identification, classification and cure of the possible sources of (mainly longitudinal) impedance between 1998 and 2001, a new campaign (essentially for the transverse impedance this time) has started few years ago, in view of the operation of the SPS with higher intensity for the LHC luminosity upgrade. The present paper summarizes the results obtained from the measurements performed over the last few years and compares them to our predictions. In particular, it reveals that the longitudinal impedance is reasonably well understood and the main contributors have already been identified. However, the situation is quite different in the transverse plane: albeit the relative evolution of the transverse impedance over the last few years can be well explained by the introduction of the nine MKE kickers necessary for beam extraction towards the LHC, significant contributors to the SPS transverse impedance have not been identified yet. CC-BY publication JACoW CERN EDS CERN-AB SIS EPAC2008 CLAS1 SzGeCERN Accelerators and Storage Rings CERN ARTICLE CERN SPS XX Arduini, Gianluigi CERN AUTHOR|(CDS)2051255 #BEARD# Bohl, T CERN Burkhardt, H CERN Calaga, R BNL Upton NY USA Caspers, Friedhelm CERN Damerau, H CERN Kroyer, T CERN Medina, H CERN Rumolo, G CERN Salvant, B EPFL, Lausanne Schokker, M CERN Shaposhnikova, E CERN Spataro, B INFN Frascati Italy Tückmantel, Joachim CERN AB RF https://accelconf.web.cern.ch/e08/papers/tupp066.pdf Published version from JACoW http://cds.cern.ch/record/1122256/files/CERN-AB-2008-008.pdf Fulltext tjitske.kehrer@cern.ch n 200835 a2008 13 20100901 1605 CER01 20080827 1048205 TUPP066 genoa20080623 PUBLIC 000700463CER ARTICLE ConferencePaper 1122260 SzGeCERN 20240223164044.0 oai:cds.cern.ch:1122260 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN-AB-2008-009 eng CERN Library AB-2008-009 Giovannozzi, M CERN Stability change of Fourth-Order Resonance with application to Multi-Turn Extraction Schemes 2008 Geneva CERN 27 Aug 2008 4 p Recently, a novel multi-turn extraction scheme was proposed, based on particle trapping inside stable resonances. Numerical simulations and experimental tests conirmed the feasibility of such a scheme for low order resonances. While the 3rd order resonance is generically unstable and those higher than 4th order are generically stable, the 4th order resonance can be either stable or unstable depending on the details of the system under consideration. By means of the normal form approach a general formula to control the stability of the 4th order resonance is derived. Numerical simulations confirm the analytical results and show that by crossing the unstable 4th order resonance the region around the centre of phase space is depleted and particles are trapped only in the four stable islands. This indicates that a four-turn extraction could be envisaged based on this technique. CC-BY publication JACoW CERN EDS CERN-AB SIS EPAC2008 CLAS1 SzGeCERN Accelerators and Storage Rings CERN ARTICLE XX XX Quatraro, D CERN and INFN sezione di Bologna Italy Turchetti, G Bologna U. INFN, Bologna AB ABP https://accelconf.web.cern.ch/e08/papers/thpc056.pdf Published version from JACoW http://cds.cern.ch/record/1122260/files/CERN-AB-2008-009.pdf Fulltext tjitske.kehrer@cern.ch n 200835 a2008 13 20100608 1158 CER01 20080827 1048205 THPC056 genoa20080623 PUBLIC 000700466CER ARTICLE ConferencePaper 1122261 SzGeCERN 20240223164044.0 oai:cds.cern.ch:1122261 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN SPIRES 7898924 Inspire 795300 CERN-AB-2008-010 eng CERN Library AB-2008-010 Barranco, J CERN Beam Losses and Collimation Considerations for PS2 2008 Geneva CERN 27 Aug 2008 4 p The high intensity beams with different emittances foreseen to be delivered by the PS2, an upgraded version of the actual CERN Proton Synchrotron, require strict control of beam losses in order to protect the machine components and enable their hands-on maintenance. Beam loss simulations based on dedicated numerical tools are undertaken for a variety of PS2 beams and for different loss mechanisms, along the whole accelerating cycle. In this respect, a first iteration of the collimation system is presented. CC-BY publication JACoW CERN EDS CERN-AB SIS EPAC2008 CLAS1 SzGeCERN Accelerators and Storage Rings CERN ARTICLE XX XX Bartmann, W CERN Benedikt, M CERN Papaphilippou, Y CERN AB ABP https://accelconf.web.cern.ch/e08/papers/thpc052.pdf Published version from JACoW http://cds.cern.ch/record/1122261/files/CERN-AB-2008-010.pdf Fulltext tjitske.kehrer@cern.ch n 200835 a2008 13 20100901 1605 CER01 20080827 1048205 THPC052 genoa20080623 PUBLIC 000700467CER ARTICLE ConferencePaper 1122289 SzGeCERN 20241025034331.0 oai:cds.cern.ch:1122289 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN SPIRES 7891750 Inspire 794586 CERN-AB-2008-011 eng CERN Library CLIC-Note-0753 CERN Library AB-2008-011 CLIC-Note-753 EUROTeV-Report-2008-040 Latina, A CERN AUTHOR|(CDS)2068659 #BEARD# Alignment of the CLIC BDS 2008 Geneva CERN 27 Aug 2008 4 p Aligning the CLIC Beam Delivery System faces two major challenges, the tight tolerances for the emittance preservation and its strong non-linear beam dynamics. For these reasons conventional beam-based alignment techniques, like dispersion free steering, are only partially successful and need to be followed by optimization algorithms based on other observables, like beam sizes. CC-BY publication JACoW CERN EDS CLIC-Note OA CERN-AB SIS EPAC2008 CLAS1 CLICARCHIVE SzGeCERN Accelerators and Storage Rings CERN ARTICLE CLIC Not applicable Schulte, D CERN Tomás, R CERN AB ABP https://accelconf.web.cern.ch/e08/papers/mopp037.pdf Published version from JACoW 18414 106522 http://cds.cern.ch/record/1122289/files/CERN-AB-2008-011.pdf Preprint tjitske.kehrer@cern.ch n 200837 a2008 13 20100901 1605 CER01 20080827 1048205 MOPP037 genoa20080623 PUBLIC 000700468CER CLINOT ARTICLE ConferencePaper 1122291 SzGeCERN 20241025034349.0 oai:cds.cern.ch:1122291 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN SPIRES 7898665 Inspire 795274 CERN-AB-2008-012 eng CERN Library CLIC-Note-0760 CERN Library AB-2008-012 CLIC-Note-760 Jeanneret, J B CERN Optimisation of a Beam Transfer FODO Line 2008 Geneva CERN 27 Aug 2008 4 p With in view the design of the CLIC long transfer lines, we develop a formal approach for the optimisation of a straight FODO line. Optimum phase advance and cell length depending on beam parameters are derived for power consumption, overall cost and sensitivity to quadrupole misalignment. CC-BY publication JACoW OA CLIC-Note CERN EDS CERN-AB SIS EPAC2008 CLAS1 CLICARCHIVE SzGeCERN Accelerators and Storage Rings CERN ARTICLE CLIC Not applicable Braun, H H CERN AB ABP https://accelconf.web.cern.ch/e08/papers/thpc017.pdf Published version from JACoW 18413 194555 http://cds.cern.ch/record/1122291/files/CERN-AB-2008-012.pdf Preprint tjitske.kehrer@cern.ch n 200835 a2008 13 20100901 1605 CER01 20080827 1048205 THPC017 genoa20080623 PUBLIC 000700470CER CLINOT ARTICLE ConferencePaper 1122730 SzGeCERN 20241025033625.0 oai:cds.cern.ch:1122730 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN SPIRES 7891520 Inspire 794564 CERN-AB-2008-013 eng CERN Library CLIC-Note-0758 CERN Library AB-2008-013 CLIC-Note-758 EUROTeV-Report-2008-042 Adli, E CERN Oslo U. Beam-Based Alignment for the CLIC Decelerator 2008 Geneva CERN 28 Aug 2008 4 p The CLIC Drive Beam decelerator requires the beam to be transported with very small losses. Beam-based alignment is necessary in order to achieve this, and various beam-based alignment schemes have been tested for the decelerator lattice. The decelerator beam has an energy spread of up to 90%, which impacts the performance of the alignment schemes. We have shown that Dispersion-Free-Steering works well for the decelerator lattice. However, because of the transverse focusing approach, modifications of the normal DFS schemes must be applied. Tune-up scenarios for the CLIC decelerator using beam-based alignment are also discussed. CC-BY publication JACoW CERN EDS CLIC-Note OA CERN-AB SIS EPAC2008 CLAS1 CLICARCHIVE SzGeCERN Accelerators and Storage Rings CERN ARTICLE CLIC Not applicable Schulte, D CERN AB ABP https://accelconf.web.cern.ch/e08/papers/mopp001.pdf Published version from JACoW 18415 434342 http://cds.cern.ch/record/1122730/files/CERN-AB-2008-013.pdf Preprint tjitske.kehrer@cern.ch n 200837 a2008 13 20090610 1503 CER01 20080828 1048205 MOPP001 genoa20080623 PUBLIC 000700475CER CLINOT ARTICLE ConferencePaper 1122737 SzGeCERN 20241025033627.0 oai:cds.cern.ch:1122737 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN SPIRES 7891539 Inspire 794565 CERN-AB-2008-014 eng CERN Library CLIC-Note-0757 CERN Library AB-2008-014 CLIC-Note-757 EUROTeV-Report-2008-041 Adli, E CERN Oslo U. A study of Failure Modes in the CLIC Decelerator 2008 Geneva CERN 28 Aug 2008 4 p The CLIC Drive Beam decelerator is responsible for producing the RF power for the main linacs, using Power Extraction and Transfer Structures (PETS). To provide uniform power production, the beam must be transported with very small losses. In this paper failure modes for the operation of the decelerator are investigated, and the impact on beam stability and loss levels is presented. Quadrupole failure, PETS inhibition and PETS RF break down scenarios are being considered. CC-BY publication JACoW CERN EDS CLIC-Note OA CERN-AB SIS EPAC2008 CLAS1 CLICARCHIVE SzGeCERN Accelerators and Storage Rings CERN ARTICLE CLIC Not applicable Schulte, D CERN Syratchev, I CERN AB ABP https://accelconf.web.cern.ch/e08/papers/MOPP002.pdf Published version from JACoW 18416 276001 http://cds.cern.ch/record/1122737/files/CERN-AB-2008-014.pdf Preprint tjitske.kehrer@cern.ch n 200837 a2008 13 20100901 1605 CER01 20080828 1048205 MOPP002 genoa20080623 PUBLIC 000700476CER CLINOT ARTICLE ConferencePaper 1122738 SzGeCERN 20240223164053.0 oai:cds.cern.ch:1122738 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN SPIRES 7898886 Inspire 795296 CERN-AB-2008-015 eng CERN Library AB-2008-015 Aumon, S Clermont-Ferrand U. Study of Beam Losses at Transition Crossing at the CERN PS 2008 Geneva CERN 28 Aug 2008 4 p A series of studies has been carried out to understand and alleviate the beam losses in the CERN PS Proton Synchrotron. Losses appear especially at transition crossing during the pulsing of special quadrupoles used to create a gamma jump scheme. However, this causes a large optics and orbit distortion. After a brief summary of the gamma jump scheme at the PS, experimental and simulation results of the loss and reduction studies are presented. CC-BY publication JACoW CERN EDS CERN-AB SIS EPAC2008 CLAS1 SzGeCERN Accelerators and Storage Rings CERN ARTICLE CERN PS Gilardoni, S CERN Martini, M CERN AB ABP https://accelconf.web.cern.ch/e08/papers/thpc048.pdf Published version from JACoW http://cds.cern.ch/record/1122738/files/CERN-AB-2008-015.pdf Fulltext tjitske.kehrer@cern.ch n 200835 a2008 13 20100901 1605 CER01 20080828 1048205 THPC048 genoa20080623 PUBLIC 000700477CER ARTICLE ConferencePaper 1122745 SzGeCERN 20241025033629.0 oai:cds.cern.ch:1122745 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN SPIRES 7901909 Inspire 795593 CERN-AB-2008-016 eng CERN Library CLIC-Note-0752 CERN Library AB-2008-016 CLIC-Note-752 EUROTeV-Report-2008-039 Tomás, R CERN Optimizing the CLIC Beam Delivery System 2008 Geneva CERN 28 Aug 2008 4 p The optimization of the new CLIC Final Focus System (FFS) with L*=3.5m is presented for a collection of CLIC beam parameters. The final performance is computed for the full Beam Delivery System including the new diagnostics section. A comparison to previous designs is also presented. CC-BY publication JACoW CERN EDS CLIC-Note OA CERN-AB SIS EPAC2008 CLAS1 CLICARCHIVE SzGeCERN Accelerators and Storage Rings CERN ARTICLE CLIC Not applicable Braun, H H CERN Jørgensen, M CERN Schulte, D CERN AB ABP https://accelconf.web.cern.ch/e08/papers/mopp038.pdf Published version from JACoW 18418 653854 http://cds.cern.ch/record/1122745/files/CERN-AB-2008-016.pdf Preprint tjitske.kehrer@cern.ch n 200837 a2008 13 20090610 1512 CER01 20080828 1048205 MOPP038 genoa20080623 PUBLIC 000700483CER CLINOT ARTICLE ConferencePaper 1122948 SzGeCERN 20241025033733.0 oai:cds.cern.ch:1122948 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN SPIRES 7895070 Inspire 794917 CERN-AB-2008-017 eng CERN Library CLIC-Note-0759 CERN Library AB-2008-017 CLIC-Note-759 EUROTeV-Report-2008-043 Latina, A CERN AUTHOR|(CDS)2068659 #BEARD# Recent Improvements in the Tracking Code Placet 2008 Geneva CERN 29 Aug 2008 4 p The tracking code Placet has recently undergone several improvements. A redesign of its internal data structures and a new user interface based on the mathematical toolbox Octave considerably expanded its simulation capabilities. Several new lattice elements, optimization algorithms and physics processes were added to allow for more complete start-to-end simulations. Finally, the use of the AML language and the Universal Parser Library have extended its interfacing capability. A review of these new features is presented in this paper. CC-BY publication JACoW CERN EDS CLIC-Note OA CERN-AB SIS EPAC2008 CLAS1 CLICARCHIVE SzGeCERN Accelerators and Storage Rings CERN ARTICLE CLIC Not applicable Adli, E CERN Burkhardt, H CERN Renier, Y Orsay, LAL Rumolo, G CERN Schulte, D CERN Tomás, R CERN AB ABP https://accelconf.web.cern.ch/e08/papers/tupp094.pdf Published version from JACoW 18419 410366 http://cds.cern.ch/record/1122948/files/CERN-AB-2008-017.pdf Preprint tjitske.kehrer@cern.ch n 200837 a2008 13 20100901 1605 CER01 20080829 1048205 TUPP094 genoa20080623 PUBLIC 000700492CER CLINOT ARTICLE ConferencePaper 1122949 SzGeCERN 20240223164055.0 oai:cds.cern.ch:1122949 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN SPIRES 7894902 Inspire 794900 CERN-AB-2008-018 eng CERN Library AB-2008-018 Salvant, B EPFL-LPHE, Lausanne Transverse Mode-Coupling Instability in the CERN SPS Comparing Moses Analytical Calculations and Headtail Simulations with experiments in the SPS 2008 Geneva CERN 29 Aug 2008 4 p Since 2003, single bunches of protons with high intensity (1.2e11 protons) and low longitudinal emittance (0.2 eVs) have been observed to suffer from heavy losses in less than one synchrotron period after injection at 26 GeV/c in the CERN Super Proton Synchrotron (SPS) when the vertical chromaticity is corrected. Understanding the mechanisms underlying this instability is crucial to assess the feasibility of an anticipated upgrade of the SPS, which requires bunches of 4e11 protons. Analytical calculations from MOSES and macroparticle tracking simulations using HEADTAIL with an SPS transverse impedance modelled as a broadband resonator had already qualitatively and quantitatively agreed in predicting the intensity threshold of a fast instability. A sensitive frequency analysis of the HEADTAIL simulations output was performed using SUSSIX, and revealed the fine structure of the mode spectrum of the bunch coherent motion. A coupling between the azimuthal modes "-2"and "-3" was clearly observed to be the reason for this fast instability. The aim of this contribution is to compare the HEADTAIL simulations with dedicated measurements performed in the SPS in 2007. CC-BY publication JACoW CERN EDS CERN-AB SIS EPAC2008 CLAS1 SzGeCERN Accelerators and Storage Rings CERN ARTICLE XX XX Arduini, Gianluigi CERN AUTHOR|(CDS)2051255 #BEARD# Calaga, R Brookhaven Jones, R CERN Métral, E CERN Papotti, G CERN Rumolo, G CERN Steinhagen, R CERN Tomás, R CERN AB ABP https://accelconf.web.cern.ch/e08/papers/tupp067.pdf Published version from JACoW http://cds.cern.ch/record/1122949/files/CERN-AB-2008-018.pdf Preprint tjitske.kehrer@cern.ch n 200836 a2008 13 20100901 1605 CER01 20080829 1048205 TUPP067 genoa20080623 PUBLIC 000700493CER ARTICLE ConferencePaper 1122950 SzGeCERN 20240223164055.0 oai:cds.cern.ch:1122950 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN SPIRES 7894880 Inspire 794898 CERN-AB-2008-019 eng CERN Library AB-2008-019 Rumolo, G CERN Experimental Study of the Electron Cloud Instability at the CERN SPS 2008 Geneva CERN 29 Aug 2008 4 p The electron cloud instability limits the performance of many existing proton and positron rings. A simulation study carried out with the HEADTAIL code revealed that the threshold for its onset decreases with increasing beam energy, if the 6D emittance of the bunch is kept constant and the longitudinal matching to the bucket is preserved. Experiments have been carried out at the CERN-SPS to study the dependence of the vertical electron cloud instability on the energy and on the beam size. The reduction of the physical transverse emittance as a function of energy is considered in fact to be the main reason for the unusual dependence of this instability on energy. CC-BY publication JACoW CERN EDS CERN-AB SIS EPAC2008 CLAS1 SzGeCERN Accelerators and Storage Rings CERN ARTICLE XX XX Arduini, Gianluigi CERN AUTHOR|(CDS)2051255 #BEARD# Benedetto, E CERN Calaga, R Brookhaven Métral, E CERN Papotti, G CERN Salvant, B EPFL, Lausanne Shaposhnikova, E CERN AB ABP https://accelconf.web.cern.ch/e08/papers/tupp065.pdf Published version from JACoW http://cds.cern.ch/record/1122950/files/CERN-AB-2008-019.pdf Fulltext tjitske.kehrer@cern.ch n 200835 a2008 13 20100608 1158 CER01 20080829 1048205 TUPP065 genoa20080623 PUBLIC 000700494CER ARTICLE ConferencePaper 1122951 SzGeCERN 20240223164055.0 oai:cds.cern.ch:1122951 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN SPIRES 7898916 Inspire 795299 CERN-AB-2008-020 eng CERN Library AB-2008-020 Franchi, A CERN Adiabaticity and Reversibility Studies for Beam Splitting using Stable Resonances 2008 Geneva CERN 29 Aug 2008 4 p At the CERN Proton Synchrotron, a series of beam experiments proved beam splitting by crossing the one-fourth resonance. Depending on the speed at which the horizontal resonance is crossed, the splitting process is more or less adiabatic, and a different fraction of the initial beam is trapped in the islands. Experiments prove that when the trapping process is reversed and the islands merged together, the final distribution features thick tails. The beam population in such tails is correlated to the speed of the resonance crossing and to the fraction of the beam trapped in the stable islands. Experiments and possible theoretical explanations are discussed. CC-BY publication JACoW CERN EDS CERN-AB SIS EPAC2008 CLAS1 SzGeCERN Accelerators and Storage Rings CERN ARTICLE XX XX Gilardoni, S CERN Giovannozzi, M CERN AB ABP https://accelconf.web.cern.ch/e08/papers/thpc051.pdf Published version from JACoW http://cds.cern.ch/record/1122951/files/CERN-AB-2008-020.pdf Fulltext tjitske.kehrer@cern.ch n 200835 a2008 13 20100901 1605 CER01 20080829 1048205 THPC051 genoa20080623 PUBLIC 000700495CER ARTICLE ConferencePaper 1122952 SzGeCERN 20240223164055.0 oai:cds.cern.ch:1122952 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN SPIRES 8022739 Inspire 799662 CERN-AB-2008-021 eng CERN Library AB-2008-021 Barranco, J CERN Study of losses during Continuous Transfer Extraction at CERN Proton Synchrotron 2008 Geneva CERN 29 Aug 2008 4 p The proton beams used for the fixed target physics at the SPS are extracted from the PS at 14 GeV/c in five turns, using a technique called Continuous Transfer (CT). During this extraction, large losses are observed in straight sections were the machine aperture should be large enough to accommodate the circulating beam without any loss. These losses are due to particles scattered by the electrostatic septum used to slice the beam and defocused by a quadrupole used during the extraction. Simulations and experimental results are presented. CC-BY publication JACoW CERN EDS CERN-AB SIS EPAC2008 CLAS1 SzGeCERN Accelerators and Storage Rings CERN ARTICLE XX XX Gilardoni, S CERN AB ABP https://accelconf.web.cern.ch/e08/papers/thpc047.pdf Published version from JACoW http://cds.cern.ch/record/1122952/files/CERN-AB-2008-021.pdf Fulltext tjitske.kehrer@cern.ch n 200835 a2008 13 20100901 1605 CER01 20080829 1048205 THPC047 genoa20080623 PUBLIC 000700496CER ARTICLE ConferencePaper 1122953 SzGeCERN 20241025034211.0 oai:cds.cern.ch:1122953 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN SPIRES 7898673 Inspire 795275 CERN-AB-2008-022 eng CERN Library CLIC-Note-0761 CERN Library AB-2008-022 CLIC-Note-761 EUROTeV-Report-2008-035 Jeanneret, J B CERN Beam Dynamics Issues in the CLIC Long Transfer Line 2008 Geneva CERN 29 Aug 2008 4 p Both the main and the drive beam of the CLIC project must be transported from the central production site to the head of the main linacs over more than twenty kilometers. Over such distances chromatic error may be substantial. With long distances and large beam currents, ion-induced detuning and instabilities and multi-bunch resistive wall effects must also be considered. These effects are quantified and simulated. Based on these results, a baseline design has been established. CC-BY publication JACoW CERN EDS CLIC-Note OA CERN-AB SIS EPAC2008 CLAS1 CLICARCHIVE SzGeCERN Accelerators and Storage Rings CERN ARTICLE CLIC Not applicable Adli, E CERN Latina, A CERN AUTHOR|(CDS)2068659 #BEARD# Rumolo, G CERN Schulte, D CERN Tomás, R CERN AB ABP https://accelconf.web.cern.ch/e08/papers/thpc018.pdf Published version from JACoW 19757 117522 http://cds.cern.ch/record/1122953/files/CERN-AB-2008-022.pdf Preprint tjitske.kehrer@cern.ch n 200838 a2008 13 20100901 1605 CER01 20080829 1048205 THPC018 genoa20080623 PUBLIC 000700497CER CLINOT ARTICLE ConferencePaper 1122954 SzGeCERN 20241025033735.0 oai:cds.cern.ch:1122954 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN SPIRES 7891881 Inspire 794599 CERN-AB-2008-023 eng CERN Library CLIC-Note-0756 CERN Library AB-2008-023 CLIC-Note-756 Antoniou, F Nat. Tech. Univ. Athens Optics Design Considerations for the CLIC Pre-Damping Rings 2008 Geneva CERN 29 Aug 2008 4 p The CLIC pre-damping rings have to accommodate a large emittance beam, coming in particular from the positron source and reduce its size to low enough values for injection into the main damping rings. Linear lattice design options based on an analytical approach for theoretical minimum emittance cells are presented. In particular the parameterisation of the quadrupole strengths and optics functions with respect to the emittance and drift lengths is derived. Complementary considerations regarding constraints imposed by positron stacking and input momentum spread are also considered. CC-BY publication JACoW OA CLIC-Note CERN EDS CERN-AB SIS EPAC2008 CLAS1 CLICARCHIVE SzGeCERN Accelerators and Storage Rings CERN ARTICLE CLIC Not applicable Papaphilippou, Y CERN AB ABP https://accelconf.web.cern.ch/e08/papers/mopp062.pdf Published version from JACoW 18274 825241 http://cds.cern.ch/record/1122954/files/CERN-AB-2008-023.pdf Preprint tjitske.kehrer@cern.ch n 200835 a2008 13 20100901 1605 CER01 20080829 1048205 MOPP062 genoa20080623 PUBLIC 000700498CER CLINOT ARTICLE ConferencePaper 1122955 SzGeCERN 20241025033736.0 oai:cds.cern.ch:1122955 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN SPIRES 7891865 Inspire 794597 CERN-AB-2008-024 eng CERN Library CLIC-Note-0755 CERN Library AB-2008-024 CLIC-Note-755 Papaphilippou, Y CERN Parameter Scan for the CLIC Damping Rings 2008 Geneva CERN 29 Aug 2008 4 p Triggered by the RF frequency reduction of the CLIC main linac cavities, the damping ring parameters had to be reevaluated and the rings performance adapted to the new luminosity requirements. In view of a staged approach for reaching the ultimate energy of the collider, the dependence of the rings output emittances under the influence of Intrabeam Scattering is evaluated with respect to different beam characteristics such as bunch population, beam energy, coupling and longitudinal beam characteristics. CC-BY publication JACoW CERN EDS CLIC-Note OA CERN-AB SIS EPAC2008 CLAS1 CLICARCHIVE SzGeCERN Accelerators and Storage Rings CERN ARTICLE CLIC Not applicable Braun, H H CERN Korostelev, M Cockroft Inst. AB ABP https://accelconf.web.cern.ch/e08/papers/mopp060.pdf Published version from JACoW 18275 775043 http://cds.cern.ch/record/1122955/files/CERN-AB-2008-024.pdf Preprint tjitske.kehrer@cern.ch n 200836 a2008 13 20100901 1605 CER01 20080829 1048205 MOPP060 genoa20080623 PUBLIC 000700499CER CLINOT ARTICLE ConferencePaper 1122956 SzGeCERN 20241025033736.0 oai:cds.cern.ch:1122956 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN SPIRES 7891806 Inspire 794591 CERN-AB-2008-025 eng CERN Library CLIC-Note-0749 CERN Library AB-2008-025 CLIC-Note-749 EUROTeV-Report-2008-037 Rumolo, G CERN Electron Cloud Build Up and Instability in the CLIC Damping Rings 2008 Geneva CERN 29 Aug 2008 4 p Electron cloud can be formed in the CLIC positron damping ring and cause intolerable tune shift and beam instability. Build up simulations with the Faktor2 code, developed at CERN, have been done to predict the cloud formation in the arcs and wigglers of the damping rings. HEADTAIL simulations have been used to study the effect of this electron cloud on the beam and assess the thresholds above which the electron cloud instability would set in. CC-BY publication JACoW CERN EDS CLIC-Note OA CERN-AB SIS EPAC2008 CLAS1 CLICARCHIVE SzGeCERN Accelerators and Storage Rings CERN ARTICLE CLIC Not applicable Bruns, W CERN Papaphilippou, Y CERN AB ABP https://accelconf.web.cern.ch/e08/papers/mopp050.pdf Published version from JACoW 18422 717504 http://cds.cern.ch/record/1122956/files/CERN-AB-2008-025.pdf Preprint tjitske.kehrer@cern.ch n 200837 a2008 13 20100901 1605 CER01 20080829 1048205 MOPP050 genoa20080623 PUBLIC 000700500CER CLINOT ARTICLE ConferencePaper 1122957 SzGeCERN 20241025033736.0 oai:cds.cern.ch:1122957 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN SPIRES 7891792 Inspire 794590 CERN-AB-2008-026 eng CERN Library CLIC-Note-0762 CERN Library AB-2008-026 CLIC-Note-762 EUROTeV-Report-2008-038 Rumolo, G CERN Collective Effects in the CLIC Damping Rings 2008 Geneva CERN 29 Aug 2008 4 p Possible performance limitations coming fromcollective effects in the CLIC damping rings are the subject of this paper. In particular, the consequences of space charge, due to the very high beam brilliance, and of the resistive wall impedance, due to the locally very small beam pipe, are considered potentially dangerous in spite of the high beam energy. Space charge has been studied in detail with the HEADTAIL code, which was modified in order to take into account a finer lattice structure. This study also includes requirements on the broad band impedance of the damping rings and ion effects in the electron ring (electron cloud in the positron ring is treated in a companion paper). Its goal is to identify all the potential design constraints determined by these phenomena. CC-BY publication JACoW CERN EDS CLIC-Note OA CERN-AB SIS EPAC2008 CLAS1 CLICARCHIVE SzGeCERN Accelerators and Storage Rings CERN ARTICLE CLIC Not applicable Jeanneret, J B CERN Papaphilippou, Y CERN Quatraro, D CERN AB ABP https://accelconf.web.cern.ch/e08/papers/mopp049.pdf Published version from JACoW 18423 207970 http://cds.cern.ch/record/1122957/files/CERN-AB-2008-026.pdf Preprint tjitske.kehrer@cern.ch n 200837 a2008 13 20100901 1605 CER01 20080829 1048205 MOPP049 genoa20080623 PUBLIC 000700501CER CLINOT ARTICLE ConferencePaper 1122958 SzGeCERN 20241025033737.0 oai:cds.cern.ch:1122958 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN SPIRES 7891784 Inspire 794589 CERN-AB-2008-027 eng CERN Library CLIC-Note-0748 CERN Library AB-2008-027 CLIC-Note-748 EUROTeV-Report-2008-036 Rumolo, G CERN Fast Ion Instability in the CLIC Transfer Line and Main LINAC 2008 Geneva CERN 29 Aug 2008 4 p The Fast Ion Instability is believed to be a serious danger for bunch trains propagating in the CLIC electron transfer line and main linac, since it may strongly affect the bunches in the tail of the train if the vacuum pressure is not below a certain threshold. We have developed the FASTION code, which can track electrons through a FODO cell line and takes into account their interactions with the produced (and possibly trapped) ions. We describe how this tool can be used for setting tolerances on the vacuum pressure and for giving specifications for the design of a feedback system. CC-BY publication JACoW CERN EDS CLIC-Note OA CERN-AB SIS EPAC2008 CLAS1 CLICARCHIVE SzGeCERN Accelerators and Storage Rings CERN ARTICLE CLIC Not applicable Schulte, D CERN AB ABP https://accelconf.web.cern.ch/e08/papers/mopp048.pdf Published version from JACoW 18424 191356 http://cds.cern.ch/record/1122958/files/CERN-AB-2008-027.pdf Preprint tjitske.kehrer@cern.ch n 200837 a2008 13 20100901 1605 CER01 20080829 1048205 MOPP048 genoa20080623 PUBLIC 000700502CER CLINOT ARTICLE ConferencePaper 1122959 SzGeCERN 20241025034132.0 oai:cds.cern.ch:1122959 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN-AB-2008-028 eng CERN Library CLIC-Note-0763 CERN Library AB-2008-028 CLIC-Note-763 Corsini, R CERN Fast Vertical Beam Instability in the CTF3 Combiner Ring 2008 Geneva CERN 29 Aug 2008 4 p The CLIC Test Facility CTF3 is being built at CERN by an international collaboration, in order to demonstrate the main feasibility issues of the CLIC two-beam technology by 2010. The facility includes an 84 m combiner ring, which was installed and put into operation in 2007. High-current operation has shown a vertical beam break-up instability, leading to high beam losses over the four turns required for nominal operation of the CTF3 ring. Such instability is most likely due to the vertically polarized transverse mode in the RF deflectors used for beam injection and combination. In this paper we report the experimental data and compare them with simulations. Possible methods to eliminate the instability are also outlined. CC-BY publication JACoW OA CLIC-Note CERN EDS CERN-AB SIS EPAC2008 CLAS1 CLICARCHIVE SzGeCERN Accelerators and Storage Rings ARTICLE CERN CLIC CTF3 Alesini, D INFN/LNF Frascati Italy Biscari, C INFN/LNF Frascati Italy Ghigo, A INFN/LNF Frascati Italy Schulte, D CERN Skowronski, P K CERN Tecker, F CERN AB ABP https://accelconf.web.cern.ch/e08/papers/mopp011.pdf Published version from JACoW 18279 1151288 http://cds.cern.ch/record/1122959/files/CERN-AB-2008-028.pdf Preprint tjitske.kehrer@cern.ch n 200835 a2008 13 20090611 1000 CER01 20080829 1048205 MOPP011 genoa20080623 PUBLIC 000700503CER CLINOT ARTICLE ConferencePaper 1123153 SzGeCERN 20241025033836.0 oai:cds.cern.ch:1123153 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN-AB-2008-029 eng CERN Library CLIC-Note-0751 CERN Library AB-2008-029 CLIC-Note-751 Corsini, R CERN Experimental Studies on Drive Beam Generation in CTF3 2008 Geneva CERN 01 Sep 2008 4 p The objective of the CLIC Test Facility CTF3, built at CERN by an international collaboration, is to demonstrate the main feasibility issues of the CLIC two-beam technology by 2010. CTF3 consists of a 150 MeV electron linac followed by a 42 m long delay loop, an 84 m combiner ring and a two-beam test area. One keyissue studied in CTF3 is the efficient generation of a very high current drive beam, used in CLIC as the power source for the acceleration of the main beam to multi-TeV energies. The beam current is first doubled in the delay loop and then multiplied again by a factor four in the combiner ring by interleaving bunches using transverse deflecting RF cavities. The combiner ring and the connecting transfer line have been installed and put into operation in 2007. In this paper we give the status of the commissioning, illustrate the beam optics measurements, discuss the main issues and present the results of the combination tests. CC-BY publication JACoW CERN EDS OA CLIC-Note CERN-AB SIS EPAC2008 CLAS1 CLICARCHIVE SzGeCERN Accelerators and Storage Rings ARTICLE CERN CLIC CTF3 Bettoni, S CERN Biscari, C Frascati Chao, Y Jefferson Lab Döbert, S CERN Ghigo, A Frascati Tecker, F CERN Skowronski, P CERN AB ABP https://accelconf.web.cern.ch/e08/papers/mopp010.pdf Published version from JACoW 18280 557997 http://cds.cern.ch/record/1123153/files/CERN-AB-2008-029.pdf Preprint tjitske.kehrer@cern.ch n 200836 a2008 13 20090611 1000 CER01 20080901 1048205 MOPP010 genoa20080623 PUBLIC 000700507CER CLINOT ARTICLE ConferencePaper 1123673 SzGeCERN 20240223164057.0 oai:cds.cern.ch:1123673 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN SPIRES 7897383 Inspire 795147 CERN-AB-2008-031 eng CERN Library AB-2008-031 Abreu, N P Brookhaven Energy Loss of Coasting Gold Ions and Deuterons in RHIC 2008 Geneva CERN 03 Sep 2008 4 p The total energy loss of coasting gold ion beams at two different energies and deuterons at one energy were measured at RHIC, corresponding to a gamma of 75.2, 107.4 and 108.7 respectively. We describe the experiment and observations and compare the measured total energy loss with expectations from ionization losses at the residual gas, the energy loss due to impedance and synchrotron radiation. We find that the measured energy losses are below what is expected from free space synchrotron radiation. We believe that this shows evidence for suppression of synchrotron radiation which is cut off at long wavelength by the presence of the conducting beam pipe. CC-BY publication JACoW CERN EDS CERN-AB SIS EPAC2008 CLAS1 SzGeCERN Accelerators and Storage Rings CERN ARTICLE XX XX Blaskiewicz, M Brookhaven Brown, K Brookhaven Burkhardt, H CERN Butler, J Brookhaven Fischer, W Brookhaven Harvey, M Brookhaven Tepikian, S Brookhaven AB ABP https://accelconf.web.cern.ch/e08/papers/wepp001.pdf Published version from JACoW http://cds.cern.ch/record/1123673/files/CERN-AB-2008-031.pdf Preprint tjitske.kehrer@cern.ch n 200836 a2008 13 20100608 1158 CER01 20080903 1048205 WEPP001 genoa20080623 PUBLIC 000700518CER ARTICLE ConferencePaper 002825690CER01 1123674 SzGeCERN 20240223164057.0 oai:cds.cern.ch:1123674 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN Inspire 790810 CERN-AB-2008-032 eng CERN Library AB-2008-032 Benedetto, E CERN Fitting Algorithms for Optical and Beam Parameters in Transfer Lines with Application to the LHC Injection Line T12 2008 Geneva CERN 03 Sep 2008 4 p As part of the commissioning with beam of the transfer line TI2 and TI8 from the SPS to the LHC [1], a series of optics measurements has been conducted. The paper presents the results in terms of Twiss parameters (including the dispersion), emittance and momentum spread obtained from the combination of trajectory and beam profile measurements. Profiting from the redundancy of monitors, there is a possibility of applying different fitting algorithms to retrieve beam parameters and to extract information on the optics of the line. The results from the different fit methods applied to the data will be compared with the expected values and cross-checked with independent measurements. CC-BY publication JACoW CERN EDS CERN-AB SIS EPAC2008 CLAS1 SzGeCERN Accelerators and Storage Rings CERN ARTICLE CERN LHC XX Agapov, I CERN Follin, F CERN Kain, V CERN AB ABP https://accelconf.web.cern.ch/e08/papers/wepp057.pdf Published version from JACoW http://cds.cern.ch/record/1123674/files/CERN-AB-2008-032.pdf Preprint tjitske.kehrer@cern.ch n 200836 a2008 13 20090915 1902 CER01 20080903 1048205 WEPP057 genoa20080623 PUBLIC 000700519CER ARTICLE ConferencePaper 002825670CER01 1123675 SzGeCERN 20240223164058.0 oai:cds.cern.ch:1123675 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN SLAC 7897758 SPIRES 7897758 Inspire 795183 CERN-AB-2008-033 eng CERN Library AB-2008-033 Benedetto, E CERN Optics Measurements and Matching of TT2-TT10 Line for Injection of the LHC Beam in the SPS 2008 Geneva CERN 03 Sep 2008 4 p A well matched injection in the SPS is very important for preserving the emittance of the LHC beam. The paper presents the algorithms used for the analysis and the results of the optics measurements done in the transfer line TT2-TT10 and in the SPS. The dispersion is computed by varying the beam momentum and recording the offsets at the BPMs, while the Twiss parameters and emittance measurements in TT2-TT10 are performed with beam profile monitors equipped with OTR screens. These results are completed by those obtained with a matching monitor installed in the SPS as a prototype for the LHC. This device makes use of an OTR screen and a fast acquisition system, to get the turn by turn beam profiles right at injection in the ring, from which the beam mismatch is computed and compared with the results obtained in the line. Finally, on the basis of such measurements, a betatron and dispersion matching of TT2-TT10 for injection in the SPS has been performed and successfully put in operation. CC-BY publication JACoW CERN EDS CERN-AB SIS EPAC2008 CLAS1 SzGeCERN Accelerators and Storage Rings CERN ARTICLE CERN LHC XX Arduini, Gianluigi CERN AUTHOR|(CDS)2051255 #BEARD# Guerrero, A CERN Jacquet, D CERN AB ABP https://accelconf.web.cern.ch/e08/papers/wepp058.pdf Published version from JACoW http://cds.cern.ch/record/1123675/files/CERN-AB-2008-033.pdf Preprint tjitske.kehrer@cern.ch n 200836 a2008 13 20100803 1410 CER01 20080903 1048205 WEPP058 genoa20080623 PUBLIC 000700520CER ARTICLE ConferencePaper 1123688 SzGeCERN 20240223164107.0 oai:cds.cern.ch:1123688 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN-AB-2008-034 eng CERN Library AB-2008-034 Goddard, B CERN AUTHOR|(CDS)2108505 #BEARD# 4 GeV H- Charge Exchange Injection into the PS2 2008 Geneva CERN 03 Sep 2008 4 p The proposed PS2 will accelerate protons from 4 to 50 GeV. The required beam intensity and brightness can only be achieved with a multi-turn H- charge exchange injection system, where the small emittance injected beam is used to paint the transverse phase space of the PS2 machine. This paper describes the constraints and conceptual design of the H- injection system and its incorporation into the present PS2 lattice. The requirements for the special injection system elements are described, in particular the injection chicane and painting magnet systems and the change exchange foil. Some key performance aspects are investigated, including the stripping efficiency, expected emittance growth and beam loss arising from the simulated number of multiple foil traversals, together with estimates of foil heating. CC-BY publication JACoW CERN EDS CERN-AB SIS EPAC2008 CLAS1 SzGeCERN Accelerators and Storage Rings ARTICLE CERN XX XX Bartmann, W CERN Benedikt, M CERN Kramer, T CERN Koschik, A CERN AB BT https://accelconf.web.cern.ch/e08/papers/thpp087.pdf Published version from JACoW http://cds.cern.ch/record/1123688/files/CERN-AB-2008-034.pdf Preprint tjitske.kehrer@cern.ch n 200836 a2008 13 20100608 1158 CER01 20080903 1048205 THPP087 genoa20080623 PUBLIC 000700531CER ARTICLE ConferencePaper 1123689 SzGeCERN 20240223164107.0 oai:cds.cern.ch:1123689 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN-AB-2008-035 eng CERN Library AB-2008-035 Kramer, T CERN Design Considerations for the PS2 Beam Dumps 2008 Geneva CERN 03 Sep 2008 4 p The different beam dump functionalities required for the proposed PS2 machine and its transfer lines are briefly described, followed by first estimates about the expected beam loads. This data has been taken as input for comparing the different technical options for the dump systems, in particular to simulate the radiological impact for internal or external beam dump options. The numbers derived have been used to help decide which of the feasible technical alternatives are preferred. CC-BY publication JACoW CERN EDS CERN-AB SIS EPAC2008 CLAS1 SzGeCERN Accelerators and Storage Rings ARTICLE CERN XX XX Benedikt, M CERN Goddard, B CERN AUTHOR|(CDS)2108505 #BEARD# Vincke, H CERN AB BT https://accelconf.web.cern.ch/e08/papers/thpp088.pdf Published version from JACoW http://cds.cern.ch/record/1123689/files/CERN-AB-2008-035.pdf Preprint tjitske.kehrer@cern.ch n 200836 a2008 13 20100608 1158 CER01 20080903 1048205 THPP088 genoa20080623 PUBLIC 000700532CER ARTICLE ConferencePaper 1123691 SzGeCERN 20240223164107.0 oai:cds.cern.ch:1123691 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN-AB-2008-036 eng CERN Library AB-2008-036 Borburgh, J CERN Septa and Distributor Developments for H- Injection into the Booster from LINAC4 2008 Geneva CERN 03 Sep 2008 4 p The construction of Linac4 requires the modification of the existing injection system of the CERN PS Booster. A new transfer line will transport 160 MeV H- ions to this machine. A system of 5 pulsed magnets (BIDIS) and 3 vertical septa (BISMV) will distribute and inject the Linac pulses into the four-vertically separated Booster rings. Subsequently the beam will be injected horizontally, using a local bump created with bumpers (BS magnets) to bring the injected H- beam together with the orbiting proton beam onto the stripper foil. To accommodate the injected H- beam, the first of the BS magnets will have to be a septum-like device, deflecting only the orbiting beam. This paper highlights the requirements and technical issues and describes the solutions to be adopted for both the BIDIS and BISMV. The results of initial prototype testing of the BIDIS magnet will also be presented. CC-BY publication JACoW CERN EDS CERN-AB SIS EPAC2008 CLAS1 SzGeCERN Accelerators and Storage Rings ARTICLE CERN XX XX Balhan, B CERN Fowler, T CERN Hourican, M CERN Weterings, W CERN AB BT https://accelconf.web.cern.ch/e08/papers/wepc141.pdf Published version from JACoW http://cds.cern.ch/record/1123691/files/CERN-AB-2008-036.pdf Preprint tjitske.kehrer@cern.ch n 200836 a2008 13 20100608 1158 CER01 20080903 1048205 WEPC141 genoa20080623 PUBLIC 000700534CER ARTICLE ConferencePaper 1123717 SzGeCERN 20240223164109.0 oai:cds.cern.ch:1123717 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN-AB-2008-037 eng CERN Library AB-2008-037 Bartmann, W CERN Gamma Transition Jump for PS2 2008 Geneva CERN 04 Sep 2008 4 p The PS2, which is proposed as a replacement for the existing ~50-year old PS accelerator, is presently considered to be a normal conducting synchrotron with an injection kinetic energy of 4 GeV and a maximum energy of 50 GeV. One of the possible lattices (FODO option) foresees crossing of transition energy near 10 GeV. Since the phase-slip-factor $\eta$ becomes very small near transition energy, many intensity dependent effects can take place in both longitudinal and transverse planes. The aim of the present paper is on the one hand to scale the gamma transition jump, used since 1973 in the PS, to the projected PS2 and on the other hand based on these results the analysis of the implementation and feasibility of a gamma transition jump scheme in a conventional FODO lattice. CC-BY publication JACoW CERN EDS CERN-AB SIS EPAC2008 CLAS1 SzGeCERN Accelerators and Storage Rings ARTICLE CERN XX XX Benedikt, M CERN Métral, E CERN Möhl, D CERN Peggs, S Brookhaven AB OP https://accelconf.web.cern.ch/e08/papers/thpp089.pdf Published version from JACoW http://cds.cern.ch/record/1123717/files/CERN-AB-2008-037.pdf Preprint tjitske.kehrer@cern.ch n 200836 a2008 13 20100608 1158 CER01 20080904 1048205 THPP089 genoa20080623 PUBLIC 000700547CER ARTICLE ConferencePaper 1123722 SzGeCERN 20240223164109.0 oai:cds.cern.ch:1123722 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN-AB-2008-038 eng CERN Library AB-2008-038 Wenninger, J CERN Protection Controls for High Power Accelerators 2008 Geneva CERN 04 Sep 2008 6 p The next generation hadron accelerators will operate with MW beams or store beams with an energy of many 100 MJ. Such accelerators must be protected by fast and very reliable interlock systems to avoid damage due to uncontrolled beam loss. Machine protection will constrain operation, but some operational flexibility is still required for commissioning and performance optimization. This is a substantial challenge for control systems and application programs. New tools are developed to face those challenges: critical settings management, software interlocks, role based access to equipment, automatic accelerator mode recognition etc. This talk presents some of the challenges and tools. Experience with novel approaches are discussed. CC-BY publication JACoW CERN EDS CERN-AB SIS EPAC2008 CLAS1 SzGeCERN Accelerators and Storage Rings ARTICLE CERN XX XX AB OP https://accelconf.web.cern.ch/e08/papers/wezg01.pdf Published version from JACoW http://cds.cern.ch/record/1123722/files/CERN-AB-2008-038.pdf Preprint tjitske.kehrer@cern.ch n 200836 a2008 13 20100608 1158 CER01 20080904 1048205 WEZG01 genoa20080623 PUBLIC 000700552CER ARTICLE ConferencePaper 1123725 SzGeCERN 20240223164109.0 oai:cds.cern.ch:1123725 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN-AB-2008-039 eng CERN Library AB-2008-039 Gilardoni, S CERN Progress in the Beam preparation for the Multi-Turn Extraction at the CERN Proton Synchrotron 2008 Geneva CERN 04 Sep 2008 4 p A new type of extraction based on beam trapping inside stable islands in the horizontal phase space will become operational during 2008 at the CERN Proton Synchrotron. A series of beam experiments was carried out to prove lossless capture with high intensity and multi-bunched beams, up to $1.5 × 10^{13}$ protons per pulse, in preparation of the extraction commissioning. These fundamental steps for the new Multi-turn Extraction are presented and discussed in details. CC-BY publication JACoW CERN EDS CERN-AB SIS EPAC2008 CLAS1 SzGeCERN Accelerators and Storage Rings ARTICLE CERN XX XX Franchi, A CERN Giovannozzi, M CERN AB ABP https://accelconf.web.cern.ch/e08/papers/thpc049.pdf Published version from JACoW http://cds.cern.ch/record/1123725/files/CERN-AB-2008-039.pdf Preprint tjitske.kehrer@cern.ch n 200836 a2008 13 20100608 1158 CER01 20080904 1048205 THPC049 genoa20080623 PUBLIC 000700555CER ARTICLE ConferencePaper 1123728 SzGeCERN 20240223164110.0 oai:cds.cern.ch:1123728 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN Inspire 799404 CERN-AB-2008-040 eng CERN Library AB-2008-040 Gilardoni, S CERN Experimental Evidence of Beam Trapping with one-third and one-fifth Resonance Crossing 2008 Geneva CERN 04 Sep 2008 4 p Beam trapping in stable islands of the horizontal phase space generated by non-linear magnetic fields is realized by means of a given tune variation so to cross a resonance of order n. Whenever the resonance is stable, n + 1 beamlets are created whereas if the resonance is unstable, the beam is split in n parts. Experiments at the CERN Proton Synchrotron showed protons trapped in stable islands while crossing the one-third and one-fifth resonance with the creation of 3 and 6 stable beamlets, respectively. The results are presented and discussed. CC-BY publication JACoW CERN EDS CERN-AB SIS EPAC2008 CLAS1 SzGeCERN Accelerators and Storage Rings ARTICLE CERN XX XX Franchi, A CERN Giovannozzi, M CERN AB ABP https://accelconf.web.cern.ch/e08/papers/thpc050.pdf Published version from JACoW http://cds.cern.ch/record/1123728/files/CERN-AB-2008-040.pdf Preprint tjitske.kehrer@cern.ch n 200836 a2008 13 20100608 1158 CER01 20080904 1048205 THPC050 genoa20080623 PUBLIC 000700558CER ARTICLE ConferencePaper 1124065 SzGeCERN 20240223164110.0 oai:cds.cern.ch:1124065 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN Inspire 799403 CERN-AB-2008-041 eng CERN Library AB-2008-041 Willeke, F Brookhaven A Storage Ring based Option for the LHeC 2008 Geneva CERN 04 Sep 2008 4 p The LHeC aims at the generation of hadron-lepton collisions with center of mass energies in the TeV scale and luminosities of the order of $10^{32}-10^{33} cm^{-2} sec^{-1}$ by taking advantage of the existing LHC 7 TeV proton ring and adding a high energy electron accelerator. This paper presents technical considerations and potential parameter choices for such a machine and outlines some of the challenges arising when an electron storage ring based option, constructed within the existing infrastructure of the LHC, is chosen. CC-BY publication JACoW CERN EDS CERN-AB SIS EPAC2008 CLAS1 SzGeCERN Accelerators and Storage Rings ARTICLE CERN XX XX Bordry, Frederick CERN Braun, H H CERN Brüning, Oliver Sim CERN Burkhardt, H CERN Chattopadhyay, S Cockcroft Inst. Accel. Sci. Tech. AUTHOR|(CDS)2108577 #BEARD# Dainton, J B Cockcroft Inst. Accel. Sci. Tech. Holzer, B DESY Jowett, John M CERN Klein, M Liverpool U. Linnecar, T CERN Mess, K H CERN Myers, S CERN Osborne, J CERN Zimmermann, F CERN AUTHOR|(CDS)2067941 #BEARD# AB ABP https://accelconf.web.cern.ch/e08/papers/wepp052.pdf Published version from JACoW http://cds.cern.ch/record/1124065/files/CERN-AB-2008-041.pdf Preprint tjitske.kehrer@cern.ch n 200837 a2008 13 20100608 1158 CER01 20080904 1048205 WEPP052 genoa20080623 PUBLIC 000700564CER ARTICLE ConferencePaper 1124077 SzGeCERN 20241025034241.0 oai:cds.cern.ch:1124077 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN Inspire 799402 CERN-AB-2008-042 eng CERN Library CLIC-Note-0744 CERN Library AB-2008-042 CLIC-Note-744 Riddone, G CERN Technical Specification for the CLIC Two-Beam Module 2008 Geneva CERN 04 Sep 2008 3 p A high-energy (0.5-3 TeV centre-of-mass), highluminosity Compact Linear Collider (CLIC) is being studied at CERN [1]. The CLIC main linacs, 21-km long each, are composed of 2-m long two beam modules. This paper presents their current layout, the main requirements for the different sub-systems (alignment, supporting, stabilization, cooling and vacuum) as well as the status of their integration. CC-BY publication JACoW CERN EDS OA CLIC-Note CERN-AB SIS EPAC2008 CLAS1 CLICARCHIVE SzGeCERN Accelerators and Storage Rings ARTICLE CERN CLIC Not applicable Mainaud-Durand, H CERN Nousiainen, R Helsinki Inst. of Phys. Samoshkin, A Dubna, JINR Schulte, D CERN Syratchev, I CERN Wuensch, W CERN Zennaro, R CERN AB RF https://accelconf.web.cern.ch/e08/papers/mopp028.pdf Published version from JACoW 18345 1900055 http://cds.cern.ch/record/1124077/files/CERN-AB-2008-042.pdf Preprint tjitske.kehrer@cern.ch n 200837 a2008 13 20090611 1000 CER01 20080904 1048205 MOPP028 genoa20080623 PUBLIC 000700573CER CLINOT ARTICLE ConferencePaper 1124081 SzGeCERN 20241025034242.0 oai:cds.cern.ch:1124081 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN Inspire 802031 CERN-AB-2008-043 eng CERN Library CLIC-Note-0745 CERN Library AB-2008-043 CLIC-Note-745 Zennaro, R CERN Study of the Validity of K. Bane's Formulae for the CLIC Accelerator Structure 2008 Geneva CERN 04 Sep 2008 4 p The comprehension of short range wakefields is essential for the design of CLIC. Useful tools are the Karl Bane's formulae which provide geometrical parameterization of the short range wake for periodic rotational-symmetric structures. The comparison of 2D computations based on ABCI with predicted results and the study of the range of validity of these formulae are the subjects of this paper. An extended model for rounded iris structures is also proposed. CC-BY publication JACoW CERN EDS OA CLIC-Note CERN-AB SIS EPAC2008 CLAS1 CLICARCHIVE SzGeCERN Accelerators and Storage Rings CERN ARTICLE CLIC Not applicable AB RF https://accelconf.web.cern.ch/e08/papers/mopp045.pdf Published version from JACoW 18346 257553 http://cds.cern.ch/record/1124081/files/CERN-AB-2008-043.pdf Preprint tjitske.kehrer@cern.ch n 200837 a2008 13 20090611 1656 CER01 20080904 1048205 MOPP045 genoa20080623 PUBLIC 000700575CER CLINOT ARTICLE ConferencePaper 002825104CER01 1124085 SzGeCERN 20241025034203.0 oai:cds.cern.ch:1124085 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN-AB-2008-044 eng CERN Library CLIC-Note-0746 CERN Library AB-2008-044 CLIC-Note-746 Kovermann, J W RWTH Aachen U. CERN Advanced Experimental Techniques for RF and DC Breakdown Research 2008 Geneva CERN 04 Sep 2008 4 p Advanced experimental techniques are being developed to analyze RF and DC breakdown events. First measurements with a specially built spectrometer have been made with a DC spark setup [1] at CERN and will soon be installed in the CLIC 30GHz accelerating structure test stand to allow comparison between DC and RF breakdown phenomena. This spectrometer is able to measure the light intensity development during a breakdown in narrow wavelength bands in the visible and near infrared range. This will give information about the important aspects of the breakdown including chemical elements, temperature, plasma parameters and possibly precursors of a breakdown. CC-BY publication JACoW CERN EDS CLIC-Note OA CERN-AB SIS EPAC2008 CLAS1 CLICARCHIVE SzGeCERN Accelerators and Storage Rings ARTICLE CERN CLIC Not applicable Calatroni, S CERN Descoeudres, A CERN Lefèvre, T CERN Wuensch, W CERN AB RF https://accelconf.web.cern.ch/e08/papers/mopp095.pdf Published version from JACoW 18347 328814 http://cds.cern.ch/record/1124085/files/CERN-AB-2008-044.pdf Preprint tjitske.kehrer@cern.ch n 200836 a2008 13 20090611 1000 CER01 20080904 1048205 MOPP095 genoa20080623 PUBLIC 000700577CER CLINOT ARTICLE ConferencePaper 1124103 SzGeCERN 20241025034249.0 oai:cds.cern.ch:1124103 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN SLAC 7917686 SPIRES 7917686 Inspire 795739 CERN-AB-2008-045 eng CERN Library CLIC-Note-0740 CERN Library AB-2008-045 CLIC-Note-740 Wuensch, W CERN CLIC Accelerating Structure Development 2008 Geneva CERN 04 Sep 2008 6 p One of the most important objectives of the CLIC (Compact Linear Collider) study is to demonstrate the design accelerating gradient of 100 MV/m in a fully featured accelerating structure under nominal operating conditions including pulse length and breakdown rate. The main issues which must be addressed and their interrelations are described along with the development and testing programs which have been put into place to accomplish this feasibility demonstration. CC-BY publication JACoW CERN EDS OA CLIC-Note CERN-AB SIS EPAC2008 CLAS1 CLICARCHIVE SzGeCERN Accelerators and Storage Rings CERN ARTICLE CLIC Not applicable AB RF https://accelconf.web.cern.ch/e08/papers/thxm01.pdf Published version from JACoW 18348 739348 http://cds.cern.ch/record/1124103/files/CERN-AB-2008-045.pdf Preprint tjitske.kehrer@cern.ch n 200836 a2008 13 20100803 1410 CER01 20080904 1048205 THXM01 genoa20080623 PUBLIC 000700590CER CLINOT ARTICLE ConferencePaper 1124106 SzGeCERN 20240223164112.0 oai:cds.cern.ch:1124106 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN Inspire 805472 CERN-AB-2008-047 eng CERN Library AB-2008-047 Tückmantel, Joachim CERN Digital Generation of Noise-Signals with Arbitrary Constant or Time-Varying Spectra 2008 Geneva CERN 04 Sep 2008 4 p Noise sources in the RF system of an accelerator produce longitudinal emittance increase or particle loss. This noise is inherent, from the beam-control system electronics, external sources or high power components, or can be purposely injected for a specific need such as bunch distribution modification or controlled emittance increase. Simulations to study these effects on the beam require precise reproduction either of the total noise measured on the hardware, or of the noise spectrum to be injected and optimized to produce the desired changes. In the latter case the 'optimized' noise source has also to be created in real-time to actually excite the beam via the RF system. This paper describes a new algorithm to create noise spectra of arbitrary spectral density varying with cycle time. It has very good statistical properties and effectively infinite period length, important for long simulation runs. It is spectrally clean and avoids undesired mirror spectra. Coded in C++, it is flexible and fast. Used extensively in simulations it has also successfully created controlled emittance increase in the SPS by the injection of artificial real-time RF noise. CC-BY publication JACoW CERN EDS CERN-AB SIS EPAC2008 CLAS1 SzGeCERN Accelerators and Storage Rings CERN ARTICLE XX XX AB RF https://accelconf.web.cern.ch/e08/papers/tupc103.pdf Published version from JACoW http://cds.cern.ch/record/1124106/files/CERN-AB-2008-047.pdf Preprint tjitske.kehrer@cern.ch n 200837 a2008 13 20100608 1158 CER01 20080904 1048205 TUPC103 genoa20080623 PUBLIC 000700593CER ARTICLE ConferencePaper 1124107 SzGeCERN 20240223164112.0 oai:cds.cern.ch:1124107 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN-AB-2008-048 eng CERN Library AB-2008-048 Angoletta, M E CERN CERN PSB Beam Tests of CNAO Synchrotron's Digital LLRF 2008 Geneva CERN 04 Sep 2008 4 p The Italian National Centre for Oncological hAdrontherapy (CNAO), in its final construction phase, uses proton and carbon ion beams to treat patients affected by solid tumours. At the heart of CNAO is a 78- meter circumference synchrotron that accelerates particles to up to 400 MeV/u. The synchrotron relies on a digital LLRF system based upon Digital Signal Processors (DSPs) and Field Programmable Gate Array (FPGA). This system implements cavity servoing and beam control capabilities, such as phase and radial loops. Beam tests of the CNAO synchrotron LLRF system were carried out at CERN's Proton Synchrotron Booster (PSB) in autumn 2007, to verify the combined DSP/FPGA architecture and the beam control capabilities. For this, a prototype version of CNAO's LLRF system was adapted to the PSB requirements. This paper outlines the prototype system layout and describes the tests carried out and their results. In particular, system architecture and beam control capabilities were successfully proven by comparison with the PSB operational beam control system and with the help of several existing beam diagnostic systems. CC-BY publication JACoW CERN EDS CERN-AB SIS EPAC2008 CLAS1 SzGeCERN Accelerators and Storage Rings CERN ARTICLE CERN PS Booster Bourrion, O LPSC, Grenoble De Martinis, C Milan U. INFN, Milan Falbo, L CNAO, Pavia Findlay, A CERN Foglio, R LPSC, Grenoble Hunt, S CNAO, Pavia Tourres, D LPSC, Grenoble Vescovi, C LPSC, Grenoble AB RF https://accelconf.web.cern.ch/e08/papers/tupc154.pdf Published version from JACoW http://cds.cern.ch/record/1124107/files/CERN-AB-2008-048.pdf Preprint tjitske.kehrer@cern.ch n 200837 a2008 13 20100608 1158 CER01 20080904 1048205 TUPC154 genoa20080623 PUBLIC 000700594CER ARTICLE ConferencePaper 1124108 SzGeCERN 20241204052830.0 CERN EDS CERN-AB SIS EPAC2008 LANL EDS CLAS1 002765681CER01 CERN LHC TOTEM LANL EDS physics.ins-det LANL EDS Physics Accelerator Physics physics.acc-ph Caspers, Fritz CERN Kroyer, Tom CERN Oriunno, Marco CERN Radermacher, Ernst CERN Soter, Anna CERN Roncarolo, Federico Manchester U. tjitske.kehrer@cern.ch SzGeCERN Accelerators and Storage Rings SzGeCERN Detectors and Experimental Techniques CERN ARTICLE TOTEM_Proc n 200836 a2008 13 CERN-AB-2008-049 Deile, Mario CERN CERN Library AB-2008-049 oai:cds.cern.ch:1124108 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN SLAC 7812736 arXiv oai:arXiv.org:0806.4974 SPIRES 7812736 Inspire 789480 arXiv arXiv:0806.4974 physics.ins-det EPAC08-TUPP029 2008 Geneva CERN 04 Sep 2008 3 p arXiv 3 pages, 8 figures, proceedings of the 11th European Particle Accelerator Conference (EPAC08), Genova, Italy, June 2008 The longitudinal and transverse beam coupling impedance of the first final TOTEM Roman Pot unit has been measured in the laboratory with the wire method. For the evaluation of transverse impedance the wire position has been kept constant, and the insertions of the RP were moved asymmetrically. With the original configuration of the RP, resonances with fairly high Q values were observed. In order to mitigate this problem, RF-absorbing ferrite plates were mounted in appropriate locations. As a result, all resonances were sufficiently damped to meet the stringent LHC beam coupling impedance requirements. arXiv The longitudinal and transverse beam coupling impedance of the first final TOTEM Roman Pot unit has been measured in the laboratory with the wire method. For the evaluation of transverse impedance the wire position has been kept constant, and the insertions of the RP were moved asymmetrically. With the original configuration of the RP, resonances with fairly high Q values were observed. In order to mitigate this problem, RF-absorbing ferrite plates were mounted in appropriate locations. As a result, all resonances were sufficiently damped to meet the stringent LHC beam coupling impedance requirements. CC-BY publication JACoW AB RF TUPP029 2008 Conf. Proc. C 0806233 To appear in the proceedings of C08-06-23.3 http://accelconf.web.cern.ch/e08/papers/tupp029.pdf Full-text at JACoW Server 1416303 372442 http://cds.cern.ch/record/1124108/files/arXiv:0806.4974.pdf 1416298 5151 http://cds.cern.ch/record/1124108/files/TUPP029f04.png 00005 Frequency and impedance of the first double resonance as a function of the distance of the vertical pots from the wire, with retracted horizontalpot. 1416299 12000 http://cds.cern.ch/record/1124108/files/TUPP029f05.png 00006 Frequency spectrum of the transmission coefficient $|S_{21}|$before and after installation of the ferrite tiles. 1416300 11305 http://cds.cern.ch/record/1124108/files/TUPP029f07.png 00010 Transmission of a Gaussian pulse of magnitude $I_{0}$ without (top) and with (bottom) ferrites for two different combinations of the horizonal (H) and vertical (V)pot distances from the wire. 1416301 333934 http://cds.cern.ch/record/1124108/files/TUPP029f01b.png 00001 Left: the vacuum chambers of a RP unit accomodating the horizontal and the vertical pots and a Beam Position Monitor. Right: the pot with the thin window and a Ferrite collar(black). 1416302 14404 http://cds.cern.ch/record/1124108/files/TUPP029f02.png 00002 Setup of the impedance measurements. 1416304 222490 http://cds.cern.ch/record/1124108/files/TUPP029f01a.png 00000 Left: the vacuum chambers of a RP unit accomodating the horizontal and the vertical pots and a Beam Position Monitor. Right: the pot with the thin window and a Ferrite collar(black). 1416305 6250 http://cds.cern.ch/record/1124108/files/TUPP029f08.png 00011 Loss factor as a function of the pot distance from the wire with and without ferrites, distinguishing movements of the vertical andhorizontal pots. 1416306 5454 http://cds.cern.ch/record/1124108/files/TUPP029f03a.png 00003 Comparison of the measured (top) and the simulated (middle and bottom) transmission coefficient $|S_{21}|$ with all pots inretracted position ($d_{x}=d_{y}=40\,$mm). 1416307 9948 http://cds.cern.ch/record/1124108/files/TUPP029f03b.png 00004 Comparison of the measured (top) and the simulated (middle and bottom) transmission coefficient $|S_{21}|$ with all pots inretracted position ($d_{x}=d_{y}=40\,$mm). 1416308 4205 http://cds.cern.ch/record/1124108/files/TUPP029f06c.png 00009 Study of the transverse impedance of the first resonance group. Top: Frequency spectra around the first resonance group for a fixed vertical RP aperture width $D =\,$40\,mm and different excentricities $y$ of this aperture with respect to the wire; middle: longitudinal impedance as a function of the excentricity $y$ for the fixed aperture width $D =\,$40\,mm; bottom: dependence of the transverse impedance on the aperture width $D$.For this entire study, the horizontal pot was in retracted position. 1416309 5351 http://cds.cern.ch/record/1124108/files/TUPP029f06b.png 00008 Study of the transverse impedance of the first resonance group. Top: Frequency spectra around the first resonance group for a fixed vertical RP aperture width $D =\,$40\,mm and different excentricities $y$ of this aperture with respect to the wire; middle: longitudinal impedance as a function of the excentricity $y$ for the fixed aperture width $D =\,$40\,mm; bottom: dependence of the transverse impedance on the aperture width $D$.For this entire study, the horizontal pot was in retracted position. 1416310 19883 http://cds.cern.ch/record/1124108/files/TUPP029f06a.png 00007 Study of the transverse impedance of the first resonance group. Top: Frequency spectra around the first resonance group for a fixed vertical RP aperture width $D =\,$40\,mm and different excentricities $y$ of this aperture with respect to the wire; middle: longitudinal impedance as a function of the excentricity $y$ for the fixed aperture width $D =\,$40\,mm; bottom: dependence of the transverse impedance on the aperture width $D$.For this entire study, the horizontal pot was in retracted position. 18352 313204 http://cds.cern.ch/record/1124108/files/CERN-AB-2008-049.pdf Preprint eng Beam Coupling Impedance Measurement and Mitigation for a TOTEM Roman Pot 20100409 2242 CER01 20080904 1048205 TUPP029 genoa20080623 PUBLIC ARTICLE TOTEM_Proc ConferencePaper 1124109 SzGeCERN 20240223164121.0 oai:cds.cern.ch:1124109 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN-AB-2008-050 eng CERN Library AB-2008-050 Damerau, H CERN Electron Cloud Mitigation by Fast Bunch Compression in the CERN PS 2008 Geneva CERN 04 Sep 2008 4 p A fast transverse instability has been observed with nominal LHC beams in the CERN Proton Synchrotron (PS) in 2006. The instability develops within less than 1 ms, starting when the bunch length decreases below a threshold of 11.5 ns during the RF procedure to shorten the bunches immediately prior to extraction. An alternative longitudinal beam manipulation, double bunch rotation, has been proposed to compress the bunches from 14 ns to the 4 ns required at extraction within 0.9 ms, saving some 4.5 ms with respect to the present compression scheme. The resultant bunch length is found to be equivalent for both schemes. In addition, electron cloud and vacuum measurements confirm that the development of an electron cloud and the onset of an associated fast pressure rise are delayed with the new compression scheme. Beam dynamics simulations and measurements of the double bunch rotation are presented as well as evidence for its beneficial effect from the electron cloud standpoint. CC-BY publication JACoW CERN EDS CERN-AB SIS EPAC2008 CLAS1 SzGeCERN Accelerators and Storage Rings ARTICLE CERN XX XX Hancock, S CERN Kroyer, T CERN Mahner, E CERN Schokker, M CERN AB RF https://accelconf.web.cern.ch/e08/papers/tupp050.pdf Published version from JACoW http://cds.cern.ch/record/1124109/files/CERN-AB-2008-050.pdf Preprint tjitske.kehrer@cern.ch n 200836 a2008 13 20100608 1158 CER01 20080904 1048205 TUPP050 genoa20080623 PUBLIC 000700596CER ARTICLE ConferencePaper 1124110 SzGeCERN 20241025034251.0 oai:cds.cern.ch:1124110 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN Inspire 807244 CERN-AB-2008-051 eng CERN Library CLIC-Note-0741 CERN Library AB-2008-051 CLIC-Note-741 Syratchev, I CERN CLIC RF High Power Production Testing Program 2008 Geneva CERN 04 Sep 2008 4 p The CLIC Power Extraction and Transfer Structure (PETS) is a passive microwave device in which bunches of the drive beam interact with the impedance of the periodically loaded waveguide and generate RF power for the main linac accelerating structure. The demands on the high power production (~ 150 MW) and the needs to transport the 100 A drive beam for about 1 km without losses, makes the PETS design rather unique and the operation very challenging. In the coming year, an intense PETS testing program will be implemented. The target is to demonstrate the full performance of the PETS operation. The testing program overview and test results available to date are presented. CC-BY publication JACoW CLIC-Note OA CERN EDS CERN-AB SIS EPAC2008 CLAS1 CLICARCHIVE SzGeCERN Accelerators and Storage Rings ARTICLE CERN CLIC Not applicable Riddone, G CERN Tantawi, S SLAC AB RF https://accelconf.web.cern.ch/e08/papers/weobg01.pdf Published version from JACoW 18354 410851 http://cds.cern.ch/record/1124110/files/CERN-AB-2008-051.pdf Preprint tjitske.kehrer@cern.ch n 200836 a2008 13 20090611 1000 CER01 20080904 1048205 WEOBG01 genoa20080623 PUBLIC 000700597CER CLINOT ARTICLE ConferencePaper 1124299 20240223164121.0 oai:cds.cern.ch:1124299 https://accelconf.web.cern.ch/e08/papers/mopc090.pdf Published version from JACoW http://cds.cern.ch/record/1124299/files/CERN-AB-2008-052.pdf Preprint DELETED 1182276 1124302 SzGeCERN 20240223164121.0 oai:cds.cern.ch:1124302 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN Inspire 808475 CERN-AB-2008-053 eng CERN Library AB-2008-053 Efthymiopoulos, I CERN AUTHOR|(CDS)2051410 #BEARD# The Merit(nTOF-11) High Intensity Liquid Mercury Target Experiment at the CERN PS 2008 Geneva CERN 05 Sep 2008 4 p The MERIT(nTOF-11) experiment is a proof-ofprinciple test of a target system for a high power proton beam to be used as front-end for a neutrino factory or a muon collider. The experiment took data in autumn 2007 with the fast-extracted beam from the CERN Proton Synchrotron (PS) to a maximum intensity of $30 × 10^{12}$ per pulse. The target system, based on a free mercury jet, is capable of intercepting a 4-MW proton beam inside a 15-T magnetic field required to capture the low energy secondary pions as the source for intense muon beams. Partice detectors installed around the target setup measure the secondary particle flux out of the target and can probe cavitation effects in the mercury jet when excited by an intense proton beam.Preliminary results of the data analysis will be presented here. CC-BY publication JACoW CERN EDS CERN-AB SIS EPAC2008 CLAS1 SzGeCERN Accelerators and Storage Rings ARTICLE CERN CERN PS nTOF11 Bennett, J R J Rutherford Caretta, O Rutherford Carroll, A J Oak Ridge Fabich, A CERN Graves, V B Oak Ridge Grudiev, A CERN Haug, F CERN Kirk, H G Brookhaven Lettry, Jacques CERN Loveridge, P Rutherford AUTHOR|(CDS)2072727 #BEARD# McDonald, K T Princeton U. Mokhov, N Fermilab AUTHOR|(CDS)2067742 #BEARD# Palm, M CERN Park, H SUNY, Stony Brook Pernegger, H CERN AUTHOR|(CDS)2067985 #BEARD# Spampinato, P T Oak Ridge Steerenberg, R CERN Striganov, S Fermilab Tsang, T Brookhaven AB ATB https://accelconf.web.cern.ch/e08/papers/mopc087.pdf Published version from JACoW http://cds.cern.ch/record/1124302/files/CERN-AB-2008-053.pdf Fulltext tjitske.kehrer@cern.ch n 200836 a2008 13 20100301 1210 CER01 20080905 1048205 MOPC087 genoa20080623 PUBLIC 000700601CER ARTICLE ConferencePaper 1124309 SzGeCERN 20240223164122.0 oai:cds.cern.ch:1124309 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN-AB-2008-054 eng CERN Library AB-2008-054 Holzer, E B CERN Development, Production and Testing of 4500 Beam Loss Monitors 2008 Geneva CERN 05 Sep 2008 4 p Beam-loss monitoring (BLM) [1] is a key element in the LHC machine protection. 4250 nitrogen filled ionization chambers (IC) and 350 secondary emission monitors (SEM) have been manufactured and tested at the Institute for High Energy Physics (IHEP) in Protvino, Russia, following their development at CERN. Signal speed and robustness against aging were the main design criteria. Each monitor is permanently sealed inside a stainless-steel cylinder. The quality of the welding was a critical aspect during production. The SEMs are requested to hold a vacuum of $10^{-7}$ bar. Impurity levels from thermal and radiationinduced desorption should remain in the range of parts per million in the ICs. To avoid radiation aging (up to $2·10^{8}$ Gy in 20 years) production of the chambers followed strict UHV requirements. IHEP designed and built the UHV production stand. Due to the required dynamic range of $10^{8}$, the leakage current of the monitors has to stay below 2 pA. Several tests during and after production were performed at IHEP and CERN. A consistently high quality during the whole production period was achieved and the tight production schedule kept at the same time. CC-BY publication JACoW CERN EDS CERN-AB SIS EPAC2008 CLAS1 SzGeCERN Accelerators and Storage Rings ARTICLE CERN XX XX Chiggiato, P CERN Dehning, B CERN Ferioli, G CERN Grishin, V Serpukhov, IHEP Jimenez, T M CERN Koshelev, A Serpukhov, IHEP Kramer, Daniel CERN Larionov, A Serpukhov, IHEP Taborelli, M CERN Seleznev, V Serpukhov, IHEP Sleptsov, M Serpukhov, IHEP Sytin, A Serpukhov, IHEP Wevers, I CERN AB BI https://accelconf.web.cern.ch/e08/papers/tupc037.pdf Published version from JACoW http://cds.cern.ch/record/1124309/files/CERN-AB-2008-054.pdf Fulltext tjitske.kehrer@cern.ch n 200837 a2008 13 20100608 1158 CER01 20080905 1048205 TUPC037 genoa20080623 PUBLIC 000700603CER ARTICLE ConferencePaper 1124312 SzGeCERN 20241025034342.0 oai:cds.cern.ch:1124312 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN-AB-2008-055 eng CERN Library CLIC-Note-0765 CERN Library AB-2008-055 CLIC-Note-765 D'Elia, A CERN High Bandwidth Wall Current Monitor for CTF3 2008 Geneva CERN 05 Sep 2008 4 p Wall Current Monitors (WCM) are commonly used to observe the time profile and spectra of a particle beam by detecting its image current. Within the framework of the EUROTeV Programme, a WCM for CLIC and ILC having a very large bandwidth (100kHz-20GHz) is required and has been developed. A deep study of the field configuration for the device has been necessary. Consequently, the geometrical parameters crucial for a proper functioning of the structure have been found. Furthermore, the very stringent initial requests (bandwidth from 100kHz to 20GHz) were reviewed in a more critical way showing that the low frequency cutoff can be sensibly increased, thus avoiding any ferrite in the structure. CC-BY publication JACoW CERN EDS CLIC-Note OA CERN-AB SIS EPAC2008 CLAS1 CLICARCHIVE SzGeCERN Accelerators and Storage Rings ARTICLE CERN CLIC CTF3 Fandos, R CERN Søby, L CERN AB BI https://accelconf.web.cern.ch/e08/papers/tupc021.pdf Published version from JACoW 18370 670154 http://cds.cern.ch/record/1124312/files/CERN-AB-2008-055.pdf Preprint tjitske.kehrer@cern.ch n 200836 a2008 13 20090611 1000 CER01 20080905 1048205 TUPC021 genoa20080623 PUBLIC 000700604CER CLINOT ARTICLE ConferencePaper 1124314 SzGeCERN 20240223164122.0 oai:cds.cern.ch:1124314 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN-AB-2008-056 eng CERN Library AB-2008-056 Barnes, M CERN Development of an Eddy Current Septum for LINAC4 2008 Geneva CERN 05 Sep 2008 4 p A linear accelerator (linac) is the first stage of the CERN accelerator complex. The linac defines the beam quality for subsequent stages of acceleration and the reliability has to be high as a fault of the linac shuts down all other machines. The existing linacs at CERN were designed 30 or more years ago: recent upgrades allowed the linacs to reach LHC requirements but also showed that they are at the limit of their brightness and intensity capabilities. A replacement Superconducting Proton Linac (SPL) has been proposed; the initial part of the SPL is termed LINAC4. The LINAC4 injection bump would be made up of a set of four pulsed dipole magnets; the first of these magnets (BS1) must act as a septum with a thin element dividing the high-field region of the circulating beam from the field-free region through which injected $H^{-}$ beam must pass. The initial specifications for BS1 required; a deflection of 66 mrad at 160 MeV, achieved with a peak field of 628 mT and a length of 250 mm: the field fall time was $40 \mu$s with a flattop of at least $100 \mu$s. The ripple of the flattop should be below ±1%. This paper discusses the design of an eddy current septum for BS1. CC-BY publication JACoW CERN EDS CERN-AB SIS EPAC2008 CLAS1 SzGeCERN Accelerators and Storage Rings ARTICLE CERN XX XX Balhan, B CERN Borburgh, J CERN Fowler, T CERN Goddard, B CERN AUTHOR|(CDS)2108505 #BEARD# Ueda, A KEK Japan Weterings, W CERN AB BT https://accelconf.web.cern.ch/e08/papers/tupd002.pdf Published version from JACoW http://cds.cern.ch/record/1124314/files/CERN-AB-2008-056.pdf Fulltext tjitske.kehrer@cern.ch n 200837 a2008 13 20100608 1158 CER01 20080905 1048205 TUPD002 genoa20080623 PUBLIC 000700606CER ARTICLE ConferencePaper 1124315 SzGeCERN 20240223164122.0 oai:cds.cern.ch:1124315 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN SPIRES 8022623 Inspire 799653 CERN-AB-2008-057 eng CERN Library AB-2008-057 Barnes, M CERN Upgrading the Fast Extractions Kicker System in SPS LSS6 2008 Geneva CERN 05 Sep 2008 4 p A fast extraction system, located in the LSS6 region of the CERN SPS accelerator, transfers 450 GeV/c protons, as well as ions, via the TI 2 transfer line towards the LHC. The system includes three travelling wave kicker magnets, all powered in series, energised by a single Pulse Forming Network (PFN) and terminated by a short circuit. The specification for the system requires a kick flattop of $7.8 \mu$s with a ripple of not more than ±0.5%. Recent measurements with beam show that the ±0.5% kick specification is achieved over $7.1 \mu$s of the kick flattop; however the ripple over $7.8 \mu$s is ±0.75%. Initial electrical measurements have been carried out on each of the three magnets; more detailed comparisons of the beam measurements and the contribution of each magnet to the detailed shape of the flattop kick will be carried out. This paper reports the results of initial measurements and plans for future measurements to permit modifications to the PFN for reducing flattop ripple. CC-BY publication JACoW CERN EDS CERN-AB SIS EPAC2008 CLAS1 SzGeCERN Accelerators and Storage Rings ARTICLE CERN CERN SPS XX Ducimetière, L CERN Goddard, B CERN AUTHOR|(CDS)2108505 #BEARD# Uythoven, J CERN AB BT https://accelconf.web.cern.ch/e08/papers/tupd003.pdf Published version from JACoW http://cds.cern.ch/record/1124315/files/CERN-AB-2008-057.pdf Fulltext tjitske.kehrer@cern.ch n 200837 a2008 13 20100901 1605 CER01 20080905 1048205 TUPD003 genoa20080623 PUBLIC 000700607CER ARTICLE ConferencePaper 1124319 SzGeCERN 20240223164122.0 oai:cds.cern.ch:1124319 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN-AB-2008-058 eng CERN Library AB-2008-058 Manglunki, Django CERN AUTHOR|(CDS)2108503 #BEARD# Ions for LHC Towards Completion of the Injector Chain 2008 Geneva CERN 05 Sep 2008 4 p The commissioning of CERN's ion injector complex [1] to allow 1.1 PeV collisions of ions in LHC is well under way. After the Low Energy Ion Ring (LEIR) in 2005 [2] and the Proton Synchrotron (PS) in 2006 [3], the Super Proton Synchrotron (SPS) has now been commissioned with the 'Early' ion beam, which should give a luminosity of $5×10^{25}cm^{-2}s^{-1}$ in the LHC. This paper summarizes the operation in 2007 of all the machines involved in the ion injection chain. CC-BY publication JACoW CERN EDS CERN-AB SIS EPAC2008 CLAS1 SzGeCERN Accelerators and Storage Rings ARTICLE CERN XX XX Albert, M CERN Angoletta, M E CERN Arduini, Gianluigi CERN AUTHOR|(CDS)2051255 #BEARD# Baudrenghien, P CERN Bellodi, G CERN Belochitskii, P CERN Benedetto, E CERN Bohl, T CERN Carli, C CERN Carlier, E CERN Chanel, M CERN Damerau, H CERN Gilardoni, S CERN Hancock, S CERN Jacquet, D CERN Jowett, John M CERN Kain, V CERN Küchler, D CERN Martini, M CERN Maury, S CERN Métral, E CERN Normann, L CERN Papotti, G CERN Pasinelli, S CERN Schokker, M CERN Scrivens, R CERN Tranquille, G CERN Vallet, J L CERN Vandorpe, B CERN Wehrle, U CERN Wenninger, J CERN AB OP https://accelconf.web.cern.ch/e08/papers/mopc131.pdf Published version from JACoW http://cds.cern.ch/record/1124319/files/CERN-AB-2008-058.pdf Fulltext tjitske.kehrer@cern.ch n 200837 a2008 13 20100608 1158 CER01 20080905 1048205 MOPC131 genoa20080623 PUBLIC 000700611CER ARTICLE ConferencePaper 1125173 SzGeCERN 20241025033827.0 oai:cds.cern.ch:1125173 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN-AB-2008-059 eng CERN Library CLIC-Note-0743 CERN Library AB-2008-059 CLIC-Note-743 Dubrovskiy, A Dubna, JINR CERN An Automatic Control System for Conditioning 30 GHz Accelerating Structures 2008 Geneva CERN 08 Sep 2008 4 p A software application programme has been developed to allow fast and automatic high-gradient conditioning of accelerating structures at 30 GHz in CTF3. The specificity of the application is the ability to control the high-power electron beam which produces the 30 GHz RF power used to condition the accelerating structures. The programme permits operation round the clock with minimum manpower requirements. In this paper the fast control system, machine control system, logging system, graphical user control interface and logging data visualization are described. An outline of the conditioning control system itself and of the feedback controlling peak power and pulse length is given. The software allows different types of conditioning strategies to be programmed CC-BY publication JACoW CERN EDS CLIC-Note OA CERN-AB SIS EPAC2008 CLAS1 CLICARCHIVE SzGeCERN Accelerators and Storage Rings CERN ARTICLE CLIC CTF3 Rodríguez, José Alberto CERN AB RF https://accelconf.web.cern.ch/e08/papers/tupp008.pdf Published version from JACoW 18395 359068 http://cds.cern.ch/record/1125173/files/CERN-AB-2008-059.pdf Preprint tjitske.kehrer@cern.ch n 200837 a2008 13 20090611 1024 CER01 20080908 1048205 TUPP008 genoa20080623 PUBLIC 000700622CER CLINOT ARTICLE ConferencePaper