1055564 SzGeCERN 20241025033911.0 CLINOT ARTICLE ConferencePaper Schulte, D CERN Adli, E CERN Taborelli, M CERN Syratchev, I CERN CLIC Not applicable CERN ARTICLE 002712135CER Tjitske.Kehrer@cern.ch CERN-AB-2007-059 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 excite preferentially the synchronous mode. The RF power produced (several hundred MW) is collected at the downstream end of the structure by means of the Power Extractor and delivered to the main linac structure. The PETS geometry is a result of multiple compromises between beam stability and main linac RF power needs. Another requirement is to provide local RF power termination in case of accelerating structure failure (ON/OFF capability). Surface electric and magnetic fields, power extraction method, HOM damping, ON/OFF capability and fabrication technology were all evaluated to provide a reliable design CERN EDS CLIC-Note OA CERN-AB CLAS1 CLICARCHIVE SzGeCERN Accelerators and Storage Rings n 200737 CLIC-Note-720 4 p High RF Power Production for CLIC oai:cds.cern.ch:1055564 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN 2007 Geneva CERN 2007 AB RF 9791 254402 http://cds.cern.ch/record/1055564/files/ab-2007-059.pdf Access to fulltext document eng CERN Library CLIC-Note-0720 CERN Library AB-2007-059 13 20090316 1554 CER01 20070910 605809 2194-2196 albuquerque20070625 PUBLIC 1055563 SzGeCERN 20241025033833.0 CLINOT ARTICLE ConferencePaper Rodríguez, J CERN CLIC Not applicable Aksakal, H Ankara U. Arnau-Izquierdo, G CERN Corsini, R CERN Döbert, S CERN Fandos, R CERN Grudiev, A CERN Johnson, M Uppsala U. AUTHOR|(CDS)2072202 #BEARD# Mete, O Ankara U. Nergiz, Z Ankara U. Syratchev, I CERN Taborelli, M CERN Tecker, F CERN Urschütz, P CERN Wuensch, W CERN CERN ARTICLE 002712131CER Tjitske.Kehrer@cern.ch CERN-AB-2007-058 The CLIC study is high power testing accelerating structures in a number of different materials and accelerating structure designs to understand the physics of breakdown, determine the appropriate scaling of performance and in particular to find ways to increase achievable accelerating gradient. The most recent 30 GHz structures which have been tested include damped structures in copper, molybdenum, titanium and aluminum. The results from these new structures are presented in this paper. CERN EDS CLIC-Note OA CERN-AB CLAS1 CLICARCHIVE SzGeCERN Accelerators and Storage Rings n 200737 CLIC-Note-719 4 p 30 GHz High-Gradient Accelerating Structure Test Results oai:cds.cern.ch:1055563 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN 2007 Geneva CERN 2007 AB RF 9790 446285 http://cds.cern.ch/record/1055563/files/ab-2007-058.pdf Access to fulltext document eng CERN Library CLIC-Note-0719 CERN Library AB-2007-058 13 20090316 1554 CER01 20070910 605809 3818-20 albuquerque20070625 PUBLIC 1055565 SzGeCERN 20241025033835.0 CLINOT ARTICLE ConferencePaper Döbert, S CERN Fandos, R CERN Grudiev, A CERN Heikkinen, S CERN Laurent, L SLAC Rodríguez, José Alberto CERN Taborelli, M CERN Wuensch, W CERN Adolphsen, C SLAC CLIC CTF3 CERN ARTICLE 002712139CER Tjitske.Kehrer@cern.ch CERN-AB-2007-060 The CLIC study group at CERN has built two X-band HDS (Hybrid Damped Structure) accelerating structures for high-power testing in NLCTA at SLAC. These accelerating structures are novel with respect to their rf-design and their fabrication technique. The eleven-cell constant impedance structures, one made out of copper and one out of molybdenum, are assembled from clamped high-speed milled quadrants. They feature the same heavy higher-order-mode damping as nominal CLIC structures achieved by slotted irises and radial damping waveguides for each cell. The X-band accelerators are exactly scaled versions of structures tested at 30 GHz in the CLIC test facility, CTF3. The results of the X-band tests are presented and compared to those at 30 GHz to determine frequency scaling, and are compared to the extensive copper data from the NLC structure development program to determine material dependence and make a basic validation of the HDS design. INTRODUCTION CERN EDS CLIC-Note OA CERN-AB CLAS1 CLICARCHIVE SzGeCERN Accelerators and Storage Rings n 200737 CLIC-Note-722 4 p High Power Test on an x-Band Slotted-Iris Accelerator Structure at NLCTA oai:cds.cern.ch:1055565 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN 2007 Geneva CERN 2007 AB RF 9792 340578 http://cds.cern.ch/record/1055565/files/ab-2007-060.pdf Access to fulltext document eng CERN Library CLIC-Note-0722 CERN Library AB-2007-060 13 20090218 1548 CER01 20070910 605809 2191-2193 albuquerque20070625 PUBLIC 1055562 SzGeCERN 20241025033833.0 CLINOT ARTICLE ConferencePaper Sladen, JPH CERN Andersson, A CERN CLIC CTF3 CERN ARTICLE 002712129CER Tjitske.Kehrer@cern.ch CERN-AB-2007-057 High precision beam phase measurements will be vital for synchronization of main and drive beams in CLIC. Development work is underway with the aim to demonstrate 0.1 degree resolution for a wideband 30 GHz measurement. In order to be able to test this with a beam exhibiting much higher phase jitter, two prototypes have been built so that the difference in their outputs can be measured. Results of measurements made with bunch trains in CTF3 are presented. CERN EDS CLIC-Note OA CERN-AB CLAS1 CLICARCHIVE SzGeCERN Accelerators and Storage Rings n 200737 CLIC-Note-721 4 p First Tests of a Precision Beam Phase Masurement System in CTF3 oai:cds.cern.ch:1055562 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN 2007 Geneva CERN 2007 AB 9789 196299 http://cds.cern.ch/record/1055562/files/ab-2007-057.pdf Access to fulltext document eng CERN Library CLIC-Note-0721 CERN Library AB-2007-057 13 20100301 1604 CER01 20070910 605809 302 albuquerque20070625 PUBLIC 1055561 SzGeCERN 20241025033905.0 CLINOT ARTICLE ConferencePaper Biscari, C Frascati Bressi, E CNAO, Milan Corsini, R CERN Döbert, S CERN Ferrari, A CERN Ghigo, A Frascati Skowronski, P CERN Urschütz, P CERN Geneva CERN 2007 CLIC CTF3 CERN ARTICLE 002712127CER Tjitske.Kehrer@cern.ch CERN-AB-2007-056 The CLIC Test Facility 3 (CTF3) has the objective to demonstrate the remaining feasibility issues of the CLIC two-beam technology for a future multi-TeV linear collider. One key issue is the efficient generation of a very high current 'drive beam' that serves as the power source for the acceleration of the main beam to high energy. This large current beam is produced by interleaving bunches in a combiner ring using transverse deflecting RF cavities. The 84 m long CTF3 combiner ring and the connecting transfer line have been recently installed and put into operation. The latest commissioning results will be presented. CERN EDS CLIC-Note OA CERN-AB CLAS1 CLICARCHIVE SzGeCERN Accelerators and Storage Rings n 200737 CLIC-Note-718 4 p oai:cds.cern.ch:1055561 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN 2007 Tecker, F CERN AB OP 9788 146429 http://cds.cern.ch/record/1055561/files/ab-2007-056.pdf Access to fulltext document eng CERN Library CLIC-Note-0718 CERN Library AB-2007-056 CTF3 Combiner Ring Commissioning 13 20100301 1604 CER01 20070910 605809 2850 albuquerque20070625 PUBLIC 1055560 SzGeCERN 20241025033832.0 Fowler, T CERN Ravida, G CERN Ueda, A CERN Barnes, M J CERN CLIC CTF3 CERN PREPRINT 002712120CER PREPRINT CLINOT ConferencePaper Tjitske.Kehrer@cern.ch CERN-AB-2007-055 The goal of the present CLIC Test Facility (CTF3) is to demonstrate the technical feasibility of specific key issues in the CLIC scheme. The extracted beam from the combiner ring (CR), of 35 A in magnitude and 140 ns duration, is sent to the new CLic EXperimental area (CLEX) facility. A Tail Clipper (TC) is required, in the CR to CLEX transfer line, to allow the duration of the extracted beam pulse to be adjusted. It is proposed to use a stripline kicker for the tail clipper, with each of the deflector plates driven to equal but opposite potential. The tail clipper kick must have a fast rise-time, of not more than 5 ns, in order to minimize uncontrolled beam loss. Several different options are being investigated to meet the demanding specifications for the modulator of the tail clipper. This paper discusses options considered for the fast, high voltage, semiconductor switches and shows results of initial tests on the switches. CERN EDS CLIC-Note OA CERN-AB CLAS1 CLICARCHIVE SzGeCERN Accelerators and Storage Rings n 200737 CLIC-Note-716 4 p Design of the Modulator the CTF3 Tail Clipper Kicker oai:cds.cern.ch:1055560 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN 2007 Geneva CERN 2007 AB BT 9787 193828 http://cds.cern.ch/record/1055560/files/ab-2007-055.pdf Access to fulltext document eng CERN Library CLIC-Note-0716 CERN Library AB-2007-055 11 20100301 1604 CER01 20070910 605809 albuquerque20070625 PUBLIC 1055558 SzGeCERN 20161219132317.0 oai:cds.cern.ch:1055558 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN-AB-2007-054 eng CERN Library AB-2007-054 Kroyer, T A New Type of distributed Enamel based Clearing Electrode 2007 Geneva CERN 2007 4 p Clearing electrodes can be used for electron cloud (EC) suppression in high intensity particle accelerators. In this paper the use of low and highly resistive layers on a dielectric substrate are examined. The beam coupling impedance of such a structure is evaluated. Furthermore the clearing efficiency as well as technological issues are discussed. CERN EDS PAC07 SIS SPIRES2008 CERN-AB CLAS1 SzGeCERN Accelerators and Storage Rings CERN ARTICLE XX XX Behler, F J Caspers, Friedhelm Hellmond, P Métral, E Wendel, J C Zimmermann, F AUTHOR|(CDS)2067941 #BEARD# AB RF http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=ab-2007-054 Access to fulltext document http://cds.cern.ch/record/1055558/files/ab-2007-054.pdf Access to fulltext document Tjitske.Kehrer@cern.ch CERN Düker GmbH, Laufach, Germany Wendel GmbH, Dillenburg, Germany Univ. Clausthal, Germany n 200737 13 20100608 1159 CER01 20070910 605809 2000 albuquerque20070625 PUBLIC 002712107CER ARTICLE ConferencePaper 1055557 SzGeCERN 20161219132316.0 oai:cds.cern.ch:1055557 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN-AB-2007-053 eng CERN Library AB-2007-053 Aiba, M 160 MeV H^- Injection from LINAC4 2007 Geneva CERN 2007 4 p The ultimate luminosity (2.3 x 10³⁴ cm^-2 s^-1) in the LHC can only be reached or even exceeded if a major upgrade of the CERN proton injector complex takes place. The first identified bottleneck towards higher brightness beams is the 50 MeV proton injection of Linac2 into the PS booster (PSB). Doubling the intensity in the PSB can be achieved with a new linac (Linac4), which increases the injection energy to 160 MeV. Linac4 will provide H- ions and use charge-exchange injection into the PSB instead of using the present multi-turn injection. We present the current status of simulations with ACCSIM, ORBIT, and ESME for all three planes. We use different initial distributions, compare the results of ACCSIM and ORBIT and highlight their differences. CERN EDS PAC07 CERN-AB CLAS1 SzGeCERN Accelerators and Storage Rings CERN PREPRINT XX XX Carli, C Cousineau, S Gerigk, F Martini, M AB RF http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=ab-2007-053 Access to fulltext document http://cds.cern.ch/record/1055557/files/ab-2007-053.pdf Access to fulltext document Tjitske.Kehrer@cern.ch CERN n 200737 11 20100608 1157 CER01 20070910 605809 albuquerque20070625 PUBLIC 002712103CER PREPRINT ConferencePaper 1055556 SzGeCERN 20161219132317.0 oai:cds.cern.ch:1055556 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN-AB-2007-052 eng CERN Library AB-2007-052 Damerau, H Controlled Longitudinal Emittance Blow-Up in the CERN PS 2007 Geneva CERN 2007 4 p The longitudinal emittance of the bunches in the CERN PS must be increased before transition crossing to avoid beam loss due to a fast vertical instability. This controlled blow-up is essential for all high-intensity beams in the PS, including those for transfer to the LHC. The higher harmonic 200MHz RF system (six cavities) used for this blow-up has to generate a total RF voltage which, for the most demanding blow-up, is comparable to the voltage of the main RF cavities. The system is presently subject to a major upgrade and a possible reduction in the number of higher harmonic RF cavities installed is under consideration. To determine the minimum required, detailed simulations and machine development studies to optimize the longitudinal blow-up have been performed. Further options to produce the required longitudinal emittance using other RF systems are also analyzed. The results obtained for the different scenarios for the longitudinal blow-up are presented and compared in this paper. CERN EDS PAC07 SIS SPIRES2008 CERN-AB CLAS1 SzGeCERN Accelerators and Storage Rings CERN ARTICLE XX XX Morvillo, M Shaposhnikova, E Tückmantel, Joachim Vallet, J L AB RF http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=ab-2007-052 Access to fulltext document http://cds.cern.ch/record/1055556/files/ab-2007-052.pdf Access to fulltext document Tjitske.Kehrer@cern.ch CERN n 200737 13 20100608 1159 CER01 20070910 605809 4186 albuquerque20070625 PUBLIC 002712099CER ARTICLE ConferencePaper 1055555 SzGeCERN 20180924165535.0 oai:cds.cern.ch:1055555 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN 10.1109/PAC.2007.4439978 DOI Inspire 772037 CERN-AB-2007-051 eng CERN Library AB-2007-051 Damerau, H Longitudinal Coupled-Bunch Instabilities in the CERN PS 2007 Geneva CERN 2007 4 p Longitudinal coupled bunch instabilities in the CERN PS represent a major limitation to the high brightness beam delivered for the LHC. To identify possible impedance sources for these instabilities, machine development studies have been carried out. The growth rates of coupled bunch modes have been measured, and modes have been identified using mountain range data. Growth rate estimations from coupled bunch mode theory are compared to these results. It is shown that the longitudinal impedance of the broad resonance curve of the main 10 MHz RF system can be identified as the most probable source. Several modes are driven simultaneously due to the large width of the resonance, which is considered for the analysis. CERN EDS PAC07 SIS SPIRES2008 CERN-AB CLAS1 SzGeCERN Accelerators and Storage Rings CERN ARTICLE XX XX Hancock, S Mehler, M Rossi, C Shaposhnikova, E Tückmantel, Joachim Vallet, J L AB RF http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=ab-2007-051 Access to fulltext document http://cds.cern.ch/record/1055555/files/ab-2007-051.pdf Access to fulltext document Tjitske.Kehrer@cern.ch CERN GSI, Darmstadt, Germany n 200737 13 20100608 1159 CER01 20070910 605809 4180 albuquerque20070625 PUBLIC 002712098CER ARTICLE ConferencePaper 1055554 SzGeCERN 20161219132317.0 oai:cds.cern.ch:1055554 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN-AB-2007-050 eng CERN Library AB-2007-050 Gerigk, F RF Structures for Linac4 2007 Geneva CERN 2007 4 p Linac4 is proposed to replace the existing proton linac at CERN (Linac2). Using an increased injection energy of 160 MeV instead of 50 MeV, Linac4 is expected to double the beam intensity in the PS Booster (PSB) and will thus be the first step towards higher brightness beams in the LHC. In this paper we re-assess the choice of RF structures for Linac4. Different accelerating structures for different energy ranges are compared in terms of RF efficiency, ease of construction and alignment, and necessary infrastructure. Eventually we present the final choice for Linac4. CERN EDS SIS SPIRES2008 CERN-AB CLAS1 SzGeCERN Accelerators and Storage Rings CERN ARTICLE XX XX Alharbi, N Pasini, M Ramberger, S Vretenar, M Wegner, R AB RF http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=ab-2007-050 Access to fulltext document http://cds.cern.ch/record/1055554/files/ab-2007-050.pdf Access to fulltext document Tjitske.Kehrer@cern.ch CERN n 200737 a2007 13 20100608 1159 CER01 20070910 605809 3821 albuquerque20070625 PUBLIC 002712093CER ARTICLE ConferencePaper 1053099 SzGeCERN 20161219132316.0 oai:cds.cern.ch:1053099 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN-AB-2007-048 eng CERN Library AB-2007-048 Kain, V High Intensity Commissioning of the SPS LSS4 extraction for CNGS 2007 Geneva CERN 2007 4 p The SPS LSS4 fast extraction system will serve both the anti-clockwise ring of the LHC and the CERN Gran Sasso Neutrino project (CNGS). CNGS requires 2 fast extractions of 10.5 microsecond long batches, 50 milliseconds apart. Each batch will consist of 2.4 × 10¹³protons at 400 GeV. These intensities are factor of 10 above the equipment damage limit in case of beam loss. Active (interlock system) and passive protection systems have to be in place to guarantee safe operation and to respect the radiation limits in zones close to the extraction region. In summer 2006 CNGS was commissioned including extraction with high intensity. A thorough setting-up of the CNGS extraction was carried out as part of the CNGS commissioning, including aperture and beam loss measurements, and defining and checking of interlock thresholds for extraction trajectory, beam loss monitors and radiation monitors. The relevant systems and risks are introduced in this paper, the commissioning results are summarised and comparisons with simulation predictions are presented. CERN EDS PAC07 SIS SPIRES2008 CERN-AB CLAS1 SzGeCERN Accelerators and Storage Rings CERN ARTICLE CERN SPS XX Carlier, E Gaxiola, E Goddard, B AUTHOR|(CDS)2108505 #BEARD# Gschwendtner, E Gourber-Pace, M Meddahi, M AUTHOR|(CDS)2051014 #BEARD# Vincke, H Vincke, H H Wenninger, J AB OP http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=ab-2007-048 Access to fulltext document http://cds.cern.ch/record/1053099/files/ab-2007-048.pdf Access to fulltext document Tjitske.Kehrer@cern.ch CERN n 200735 13 20090915 1903 CER01 20070827 605809 1604 albuquerque20070625 PUBLIC 002710490CER ARTICLE ConferencePaper 1053098 SzGeCERN 20161219132316.0 oai:cds.cern.ch:1053098 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN-AB-2007-047 eng CERN Library AB-2007-047 Bartmann, W Optics Considerations for the PS2 2007 Geneva CERN 2007 4 p CERN envisages replacing the existing Proton Synchrotron (PS) with a larger synchrotron (PS2) capable of injecting at higher energy into the SPS. Since it should increase the performance not only of the LHC but also CNGS and other users of beams from CERN's hadron injector complex, the new accelerator must retain much of the flexibility of the present complex. A number of candidate optics, with and without transition crossing, have been evaluated systematically and compared. CERN EDS PAC07 SIS SPIRES2008 CERN-AB CLAS1 SzGeCERN Accelerators and Storage Rings CERN ARTICLE XX XX Benedikt, M Carli, C Goddard, B AUTHOR|(CDS)2108505 #BEARD# Hancock, S Jowett, John M Papahilippou, Y AB OP http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=ab-2007-047 Access to fulltext document http://cds.cern.ch/record/1053098/files/ab-2007-047.pdf Access to fulltext document Tjitske.Kehrer@cern.ch CERN n 200735 13 20100608 1159 CER01 20070827 605809 739 albuquerque20070625 PUBLIC 002710485CER ARTICLE ConferencePaper 1053097 SzGeCERN 20161219132316.0 oai:cds.cern.ch:1053097 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN-AB-2007-046 eng CERN Library AB-2007-046 Gschwendtner, E CERN Design and Performance of the CNGS Secondary Beam Line 2007 Geneva CERN 2007 4 p An intense muon-neutrino beam (10¹⁷<font face="Symbol">n_m</font> /day) is generated at CERN and directed towards the Gran Sasso National Laboratory, LNGS, in Italy, 732 km away from CERN. <br> In the presently approved physics programme, it is foreseen to run the CNGS facility with 4.5.10¹⁹ protons per year for five years. During a nominal CNGS cycle, i.e. every 6s, two nominal SPS extractions of 2.4.10¹³ protons each at 400GeV/c are sent down the proton beam line to the target.<br> The CNGS secondary beam line, starting with the target, has to cope with this situation, which pushes the beam line equipment and instrumentation to the limits of radiation hardness and mechanical stresses during the CNGS operation.<br> An overview of the CNGS secondary beam line is given. Emphasis is on the target, the magnetic focusing lenses (horn and reflector) and the muon monitors. The performance of the secondary beam line during beam commissioning and physics operation is discussed and measurements are compared with simulations. CERN EDS SIS SPIRES2008 CERN-AB CLAS1 SzGeCERN Accelerators and Storage Rings CERN ARTICLE XX XX Bruno, L CERN Elsener, K CERN Ferrari, A CERN Guglielmi, A INFN Padova, Italy Meddahi, M CERN AUTHOR|(CDS)2051014 #BEARD# Pardons, A CERN Rangod, Stephane CERN Sala, P INFN Milano, Italy AB ATB http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=ab-2007-046 Access to fulltext document http://cds.cern.ch/record/1053097/files/ab-2007-046.pdf Access to fulltext document Tjitske.Kehrer@cern.ch n 200735 13 20100608 1159 CER01 20070827 605809 1601 albuquerque20070625 PUBLIC 002710343CER ARTICLE ConferencePaper 1053096 SzGeCERN 20241025033649.0 CLINOT ARTICLE ConferencePaper Agapov, I Royal Holloway, U. of London CLIC Not applicable Blair, G Royal Holloway, U. of London Burkhardt, H CERN Jackson, F Daresbury Latina, A CERN AUTHOR|(CDS)2068659 #BEARD# Neukermans, L CERN Schulte, D CERN CERN ARTICLE 002710336CER Tjitske.Kehrer@cern.ch CERN-AB-2007-045 Halo simulations and estimates are important for the design of future linear accelerators. We describe the main processes with analytic estimates and present our generic simulations in application to the ILC. CERN EDS CLIC-Note OA CERN-AB CLAS1 CLICARCHIVE SzGeCERN Accelerators and Storage Rings n 200735 CLIC-Note-714 4 p Halo Estimates and Simulations for Linear Colliders oai:cds.cern.ch:1053096 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN 2007 Geneva CERN 2007 AB ABP 9777 135034 http://cds.cern.ch/record/1053096/files/ab-2007-045.pdf Access to fulltext document eng CERN Library CLIC-Note-0714 CERN Library AB-2007-045 13 20090316 1554 CER01 20070827 605809 2041-2043 albuquerque20070625 PUBLIC 1051557 SzGeCERN 20161219132316.0 oai:cds.cern.ch:1051557 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN-AB-2007-043 eng CERN Library AB-2007-043 Weterings, W 160 MeV $H^-$ Injection into the CERN PSB 2007 Geneva CERN 2007 4 p The H^- beam from the proposed LINAC4 will be injected into the four existing rings of the PS Booster at 160 MeV. A substantial upgrade of the injection region is required, including the modification of the beam distribution system and the construction of a new H^- injection system. This paper discusses beam dynamics and hardware requirements and presents the results of optimisation studies of the injection process for different beam characteristics and scenarios. The resulting conceptual design of the injection region is presented, together with the main hardware modifications and performance specifications. CERN EDS SIS SPIRES2008 CERN-AB CLAS1 SzGeCERN Accelerators and Storage Rings CERN ARTICLE CERN PS Booster Bellodi, G Borburgh, J Fowler, T Gerigk, F Goddard, B AUTHOR|(CDS)2108505 #BEARD# Hanke, K Martini, M Sermeus, L AB BT http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=ab-2007-043 Access to fulltext document http://cds.cern.ch/record/1051557/files/ab-2007-043.pdf Access to fulltext document Tjitske.Kehrer@cern.ch CERN n 200733 13 20100608 1159 CER01 20070816 605809 1628 albuquerque20070625 PUBLIC 002709007CER ARTICLE ConferencePaper 1051556 SzGeCERN 20161219132316.0 oai:cds.cern.ch:1051556 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN-AB-2007-042 eng CERN Library AB-2007-042 Kramer, T Studies of Beam Losses from Failures of SPS Beam Dump Kickers 2007 Geneva CERN 2007 4 p The SPS beam dump extraction process was studied in detail to investigate the possibility of operation with reduced kicker voltage and to fully understand the trajectories and loss patterns of miss-kicked beam. This paper briefly describes the SPS beam dump process, and presents the tracking studies carried out for failure cases. The simulation results are compared to the results of measurements made with low intensity beam. CERN EDS SIS SPIRES2008 CERN-AB CLAS1 SzGeCERN Accelerators and Storage Rings CERN ARTICLE CERN SPS XX Arduini, Gianluigi AUTHOR|(CDS)2051255 #BEARD# Berrig, O Carlier, E Ducimetière, L Goddard, B AUTHOR|(CDS)2108505 #BEARD# Koschik, A Uythoven, J AB BT http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=ab-2007-042 Access to fulltext document http://cds.cern.ch/record/1051556/files/ab-2007-042.pdf Access to fulltext document Tjitske.Kehrer@cern.ch CERN n 200733 13 20090915 1903 CER01 20070816 605809 1607 albuquerque20070625 PUBLIC 002709002CER ARTICLE ConferencePaper 1051554 SzGeCERN 20161219132316.0 oai:cds.cern.ch:1051554 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN-AB-2007-041 eng CERN Library AB-2007-041 Bartmann, W PS2 Injection, Extraction and Beam Transfer Concepts 2007 Geneva CERN 2007 4 p The replacement of CERN's existing 26 GeV Proton Synchrotron (PS) machine with a separated-function synchrotron PS2 has been identified as an important part of the possible future upgrade programme of the CERN accelerator complex. The PS2 will require a number of new beam transfer systems associated with injection, extraction, beam dumping and transfer. The different requirements are briefly presented, together with an overview of the conceptual design of these systems, based on the initial PS2 parameter set. The required equipment sub-system performance is derived and discussed. Possible limitations are analysed and the impact on the overall design and parameter set is discussed. CERN EDS PAC07 SIS SPIRES2008 CERN-AB CLAS1 SzGeCERN Accelerators and Storage Rings CERN ARTICLE XX XX Benedikt, M Goddard, B AUTHOR|(CDS)2108505 #BEARD# Kramer, T Koschik, A AB BT http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=ab-2007-041 Access to fulltext document http://cds.cern.ch/record/1051554/files/ab-2007-041.pdf Access to fulltext document Tjitske.Kehrer@cern.ch CERN n 200733 13 20100608 1159 CER01 20070816 605809 1598 albuquerque20070625 PUBLIC 002709000CER ARTICLE ConferencePaper 1051379 SzGeCERN 20161219132316.0 oai:cds.cern.ch:1051379 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN-AB-2007-040 eng CERN Library AB-2007-040 Weiler, Th Beam Loss Response Measurements with a LHC Prototype Collimator in the SPS 2007 Geneva CERN 14 Aug 2007 4 p Beam tests with a Large Hadron Collider (LHC) prototype collimator were performed at the Super Proton Synchrotron (SPS) in autumn 2006. Applying a new collimator control system many new beam measurements were performed. This contribution presents results on collimatorinduced beam loss measurements and their applications to beam-based alignment of collimators and measurements of the beam size and position. Interesting features of the recorded beam loss signals are illustrated and possible impacts for LHC operation are discussed. CERN EDS CERN-AB CLAS1 SzGeCERN Accelerators and Storage Rings CERN PREPRINT CERN LHC XX Arduini, Gianluigi AUTHOR|(CDS)2051255 #BEARD# Assmann, Ralph Wolfgang Bracco, C Braun, H Dehning, B Gander, P Holzer, E B Jonker, M Losito, R Masi, A Ponce, L Redaelli, S Robert-Démolaize, G Sobczak, M Wenninger, J AB ABP http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=ab-2007-040 Access to fulltext document http://cds.cern.ch/record/1051379/files/ab-2007-040.pdf Access to fulltext document Tjitske.Kehrer@cern.ch CERN n 200733 11 20090915 1902 CER01 20070815 605809 albuquerque20070625 PUBLIC 002708835CER PREPRINT ConferencePaper 1051376 SzGeCERN 20161219132316.0 oai:cds.cern.ch:1051376 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN-AB-2007-039 eng CERN Library AB-2007-039 Meddahi, M AUTHOR|(CDS)2051014 #BEARD# CERN Neutrinos to Gran Sasso (CNGS) Results from Commissioning 2007 Geneva CERN 2007 4 p The CNGS project (CERN Neutrinos to Gran Sasso) aims at directly detecting <i> <font face="Symbol">n_m</font> -<font face="Symbol"> n_t</font></i> oscillations. An intense <i> <font face="Symbol">n_m</font></i> beam is generated at CERN and directed towards LNGS (Laboratori Nazionali del Gran Sasso) in Italy where <i><font face="Symbol">n_t</font></i> will be detected in large and complex detectors. <br> An overview of the CNGS beam facility is given. Results from the primary and secondary beam line commissioning performed in summer 2006 are presented. Measurements are compared with expectations. CERN EDS SIS SPIRES2008 CERN-AB CLAS1 SzGeCERN Accelerators and Storage Rings CERN ARTICLE XX XX Cornelis, K Elsener, K Gschwendtner, E Herr, Werner Kain, V Lamont, M Wenninger, J AB CNGS Commissioning Team ABP http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=ab-2007-039 Access to fulltext document http://cds.cern.ch/record/1051376/files/ab-2007-039.pdf Access to fulltext document Tjitske.Kehrer@cern.ch CERN n 200733 13 20100608 1159 CER01 20070815 605809 692 albuquerque20070625 PUBLIC 002708834CER ARTICLE ConferencePaper 1051375 SzGeCERN 20161219132316.0 oai:cds.cern.ch:1051375 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN-AB-2007-038 eng CERN Library AB-2007-038 Barranco, J Beam Loss Map Simulations and Measurements in the CERN PS. 2007 Geneva CERN 2007 4 p Numerical tools providing detailed beam loss maps, recently developed for the design of the Large Hadron Collider (LHC) collimation system, were adapted to low energy synchrotrons. Using a MADX optics sequence model, these tools are able to track a large number of particles with SixTrack and interact with a realistic aperture model to simulate particle losses all around the ring. Finally the comparison between the dedicated simulations and measured proton loss pattern at the CERN PS showed good agreement between them. CERN EDS PAC07 SIS SPIRES2008 CERN-AB CLAS1 SzGeCERN Accelerators and Storage Rings CERN ARTICLE XX XX Berrig, O Gilardoni, S Jeanneret, B Robert-Démolaize, G Papaphilippou, Y AB ABP http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=ab-2007-038 Access to fulltext document http://cds.cern.ch/record/1051375/files/ab-2007-038.pdf Access to fulltext document Tjitske.Kehrer@cern.ch CERN BNL, Upton, USA n 200733 13 20100608 1159 CER01 20070815 605809 3372 albuquerque20070625 PUBLIC 002708833CER ARTICLE ConferencePaper 1051374 SzGeCERN 20161219132316.0 oai:cds.cern.ch:1051374 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN-AB-2007-037 eng CERN Library AB-2007-037 Arduini, Gianluigi CERN AUTHOR|(CDS)2051255 #BEARD# Fast Vertical Single-bunch Instability at Injection in the CERN SPS An Update 2007 Geneva CERN 2007 4 p Following the first observation of a fast vertical instability for a single high-brightness bunch at injection in the SPS in 2002, a series of detailed measurements and simulations has been performed in order to assess the resulting potential intensity limitations for the SPS, as well as possible cures. During the 2006 run, the characteristics of this instability were studied further, extending the intensity range of the measurements, and comparing the experimental data with simulations that take into account the latest measurements of the transverse machine impedance. In this paper, we summarize the outcome of these studies and our understanding of the mechanisms leading to this instability. The corresponding intensity limitations were also determined. CERN EDS PAC07 SIS SPIRES2008 CERN-AB CLAS1 SzGeCERN Accelerators and Storage Rings CERN ARTICLE XX XX Bohl, T CERN Burkhardt, H CERN Métral, E CERN Rumolo, G CERN Salvant, B EFPL, Lausanne, Switzerland CERN AB ABP http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=ab-2007-037 Access to fulltext document http://cds.cern.ch/record/1051374/files/ab-2007-037.pdf Access to fulltext document Tjitske.Kehrer@cern.ch n 200733 13 20100608 1159 CER01 20070815 605809 4162 albuquerque20070625 PUBLIC 002708832CER ARTICLE ConferencePaper 1051373 SzGeCERN 20161219132316.0 oai:cds.cern.ch:1051373 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN-AB-2007-036 eng CERN Library AB-2007-036 CARE-Conf-07-013-HHH CARE-Conf-2007-013-HHH Benedetto, E Modeling Incoherent Electron Cloud Effects 2007 Geneva CERN 2007 4 p Incoherent electron effects could seriously limit the beam lifetime in proton or ion storage rings, such as LHC, SPS, or RHIC, or blow up the vertical emittance of positron beams, e.g., at the B factories or in linear-collider damping rings. Different approaches to modeling these effects each have their own merits and drawbacks. We describe several simulation codes which simplify the descriptions of the beam-electron interaction and of the accelerator structure in various different ways, and present results for a toy model of the SPS. In addition, we present evidence that for positron beams the interplay of incoherent electron-cloud effects and synchrotron radiation can lead to a significant increase in vertical equilibrium emittance. The magnitude of a few incoherent e+e- scattering processes is also estimated. Options for future code development are reviewed. CERN EDS SIS CARE2008 PAC07 SIS SPIRES2008 CERN-AB CLAS1 SzGeCERN Accelerators and Storage Rings CERN ARTICLE XX XX Fischer, W Franchetti, G Rumolo, G Ohmi, K Pivi, M Raubenheimer, T O Schulte, D Sonnad, K Tomás, R Vay, J L Zimmermann, F AUTHOR|(CDS)2067941 #BEARD# AB ABP http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=ab-2007-036 Access to fulltext document http://documents.cern.ch/archive/electronic/other/uploader/CARE/Conf/care-conf-07-013.pdf Fulltext http://cds.cern.ch/record/1051373/files/ab-2007-036.pdf Access to fulltext document http://cds.cern.ch/record/1051373/files/care-conf-07-013.pdf Fulltext Tjitske.Kehrer@cern.ch CERN GSI, Darmstadt, Germany KEK, Tsukuba, Japan SLAC BNL, Brookhaven, USA LBNL, Berkeley, USA n 200733 13 20100608 1159 CER01 20070815 605809 3393 albuquerque20070625 PUBLIC 002708831CER ARTICLE ConferencePaper 1051372 SzGeCERN 20241025033807.0 CLINOT ARTICLE ConferencePaper Eliasson, P Uppsala U. Schulte, D CERN CLIC Not applicable CERN ARTICLE 002708830CER Tjitske.Kehrer@cern.ch CERN-AB-2007-035 Misalignments in the main linac of future linear colliders can lead to significant emittance growth. Beam-based alignment algorithms, such as Dispersion Free Steering (DFS), are necessary to mitigate these effects. We study how to use the Bunch Compressor to create the off-energy beams necessary for DFS and discuss the effectiveness of this method. CERN EDS CLIC-Note OA CERN-AB CLAS1 CLICARCHIVE SzGeCERN Accelerators and Storage Rings n 200733 CLIC-Note-713 Latina, A CERN AUTHOR|(CDS)2068659 #BEARD# 4 p Bunch Compressor for Beam-Based Alignment oai:cds.cern.ch:1051372 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN 2007 Geneva CERN 2007 AB ABP 9766 254800 http://cds.cern.ch/record/1051372/files/ab-2007-035.pdf Access to fulltext document eng CERN Library CLIC-Note-0713 CERN Library AB-2007-035 13 20090316 1554 CER01 20070815 605809 2844 albuquerque20070625 PUBLIC 1051371 SzGeCERN 20241025033807.0 CLINOT ARTICLE ConferencePaper Rumolo, G CERN Schulte, D CERN Tomás, R CERN CLIC Not applicable CERN ARTICLE 002708829CER Tjitske.Kehrer@cern.ch CERN-AB-2007-034 Dynamic imperfections in future linear colliders can lead to a significant luminosity loss. We discuss different orbit feedback strategies in the main linac that can mitigate the emittance dilution and compare their efficiency. We also address the impact of ground motion in the beam delivery system and the potential cures. CERN EDS CLIC-Note OA CERN-AB CLAS1 CLICARCHIVE SzGeCERN Accelerators and Storage Rings n 200733 CLIC-Note-715 Latina, A CERN AUTHOR|(CDS)2068659 #BEARD# 4 p Feedback Studies oai:cds.cern.ch:1051371 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN 2007 Geneva CERN 2007 AB ABP 9765 221010 http://cds.cern.ch/record/1051371/files/cer-002708829.pdf Fulltext eng CERN Library CLIC-Note-0715 CERN Library AB-2007-034 13 20090316 1554 CER01 20070815 605809 2841 albuquerque20070625 PUBLIC 1051103 SzGeCERN 20241025033642.0 oai:cds.cern.ch:1051103 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN 10.1109/PAC.2007.4440431 DOI Inspire 769967 CERN-AB-2007-033 eng CERN Library CLIC-Note-0711 CERN Library AB-2007-033 CLIC-Note-711 Latina, A CERN AUTHOR|(CDS)2068659 #BEARD# Wakefield models for particle tracking codes 2007 Geneva CERN 2007 4 p Wakefields have a considerable effect on beam dynamics and they must not be neglected for emittance growth studies, background estimates and other problems. The codes used for these problems are normally not capable of self-consistent wakefield calculations. They should thus be extended with either analytical models or export the wakefields numerically evaluated with other codes when analytical models are not feasible. We discuss both approaches and present their implementation in PLACET and BDSIM. The simulation results for the ILC and CLIC beam delivery systems are given as an example. CERN EDS CLIC-Note OA CERN-AB CLAS1 CLICARCHIVE SzGeCERN Accelerators and Storage Rings CERN ARTICLE CLIC Not applicable Barlow, R J Manchester U. AUTHOR|(CDS)2073232 #BEARD# Blair, G Royal Holloway, U. of London Bungau, A Manchester U. Malton, S Royal Holloway, U. of London Rumolo, G CERN Schulte, D CERN Smith, J D A Lancaster U. AB ABP 9764 206978 http://cds.cern.ch/record/1051103/files/ab-2007-033.pdf Access to fulltext document Tjitske.Kehrer@cern.ch n 200733 13 20090316 1554 CER01 20070814 605809 3378 albuquerque20070625 PUBLIC 002708613CER CLINOT ARTICLE ConferencePaper 1051102 SzGeCERN 20161219132315.0 oai:cds.cern.ch:1051102 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN-AB-2007-032 eng CERN Library AB-2007-032 Métral, E CERN Simulation study of the horizontal head-tail instability observed at injection of the CERN Proton Synchrotron 2007 Geneva CERN 2007 4 p For many years, a horizontal head-tail instability has been observed at the CERN Proton Synchrotron during the long 1.2 s injection flat-bottom. This slow instability has been damped using linear coupling only, i.e. with neither octupoles nor feedbacks. Using the nominal machine and beam parameters for LHC, the sixth head-tail mode number is usually observed. Several other modes were also observed in the past by tuning the chromaticity, and these observations were found to be in good agreement with Sacherer's formula. The purpose of this paper is to present the results of assessing the effect of chromaticity and linear coupling on this slow head-tail instability using the HEADTAIL simulation code, and to compare these simulations with both measurements performed over the last few years, and theoretical calculations. CERN EDS SIS SPIRES2008 CERN-AB CLAS1 SzGeCERN Accelerators and Storage Rings CERN ARTICLE XX XX Rumolo, G CERN Salvant, B EPFL, Lausanne CERN Steerenberg, R CERN AB ABP http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=ab-2007-032 Access to fulltext document http://cds.cern.ch/record/1051102/files/ab-2007-032.pdf Access to fulltext document Tjitske.Kehrer@cern.ch n 200733 13 20100608 1159 CER01 20070814 605809 4210 albuquerque20070625 PUBLIC 002708612CER ARTICLE ConferencePaper 1055568 SzGeCERN 20161219132317.0 oai:cds.cern.ch:1055568 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN-AB-2007-062 eng CERN Library AB-2007-062 Boccardi, A The FPGA-based Continious FFT Tune Measurement System for the LHC and its test at the CERN SPS 2007 Geneva CERN 2007 4 p A base band tune (BBQ) measurement system has been developed at CERN. This system is based on a high-sensitivity direct-diode detection technique followed by a high resolution FFT algorithm implemented in an FPGA. The system allows acquisition of continuous real-time spectra with 32-bit resolution, while a digital frequency synthesiser (DFS) can provide an acquisition synchronised chirp excitation. All the implemented algorithms support dynamic reconfiguration of processing and excitation parameters. Results from both laboratory measurements and tests performed with beam at the CERN SPS are presented. CERN EDS PAC07 CERN-AB CLAS1 SzGeCERN Accelerators and Storage Rings CERN PREPRINT CERN LHC XX Gasior, M Jones, R Kasinski, K Steinhagen, R J AB BI http://documents.cern.ch/cgi-bin/setlink?base=preprint&categ=cern&id=ab-2007-062 Access to fulltext document http://cds.cern.ch/record/1055568/files/ab-2007-062.pdf Access to fulltext document Tjitske.Kehrer@cern.ch CERN n 200737 11 20090915 1902 CER01 20070910 605809 albuquerque20070625 PUBLIC 002712174CER PREPRINT ConferencePaper 1124104 SzGeCERN 20241025034249.0 oai:cds.cern.ch:1124104 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN SPIRES 8022631 Inspire 799654 CERN-AB-2008-046 eng CERN Library CLIC-Note-0742 CERN Library AB-2008-046 CLIC-Note-742 Geschonke, Günther CERN Results from the CLIC Test Facility CFT3 and update on the CLIC Design 2008 Geneva CERN 04 Sep 2008 6 p The CLIC Test Facility CTF3 is being built and commissioned in stages. Up to now the facility consists of an electron linac, a magnetic chicane for changing bunch length, the Delay Loop and the Combiner Ring. Recent experience and commissioning results will be presented together with plans for the next steps which should lead to feasibility demonstration of CLIC technology by the year 2010. The CLIC design has been reviewed in detail. The resulting changes in parameters will be presented. CC-BY publication JACoW CERN EDS CLIC-Note OA CERN-AB SIS EPAC2008 CLAS1 CLICARCHIVE SzGeCERN Accelerators and Storage Rings CERN ARTICLE CLIC CTF3 for the CLIC/CTF3 Collaboration AB RF https://accelconf.web.cern.ch/e08/papers/thyg02.pdf Published version from JACoW 18349 614228 http://cds.cern.ch/record/1124104/files/CERN-AB-2008-046.pdf Preprint tjitske.kehrer@cern.ch n 200836 a2008 13 20100901 1605 CER01 20080904 1048205 THYG02 genoa20080623 PUBLIC 000700591CER CLINOT ARTICLE ConferencePaper