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1.
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Performance of the LHC magnet system
/ Parma, V (CERN) ; Rossi, L (CERN)
The LHC magnet system, essentially composed of superconducting magnets operating at 1.9 K, has been largely commissioned in 2007-08. Before the serious incident of 19th September 2008, the magnet system was commissioned up to 7 kA (4 TeV proton beam energy); six (out of eight) sectors were commissioned up to 5.5 TeV and one up to 6.6 TeV. [...]
CERN-ATS-2009-023.-
Geneva : CERN, 2010 - 6 p.
Published version from PAC09: PDF;
In : Particle Accelerator Conference 2009, Vancouver, Canada, 04 - 08 May 2009, pp.TU1RAI03
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2.
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Simulation results for crystal collimation experiment in SPS UA9
/ Laface, E (CERN) ; Scandale, Walter (CERN) ; Cavoto, G (INFN, Rome) ; Peggs, S (Brookhaven)
The UA9 experiment will first take place in 2009 at the CERN-SPS and will evaluate the feasibility of silicon crystals as primary collimators for a storage ring. A crystal placed at 6 σ from the beam core will deviate protons towards two Roman Pots and a tungsten absorber (TAL). [...]
CERN-ATS-2009-022.-
Geneva : CERN, 2010 - 4 p.
Published version from PAC09: PDF;
In : Particle Accelerator Conference 2009, Vancouver, Canada, 04 - 08 May 2009, pp.WE6RFP019
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3.
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Experience with the LHC beam dump post-operational checks system
/ Uythoven, J (CERN) ; Axensalva, J (CERN) ; Baggiolini, V (CERN) ; Carlier, E (CERN) ; Gallet, E (CERN) ; Goddard, B (CERN) ; Kain, V (CERN) ; Lamont, M (CERN)
After each beam dump in the LHC automatic post-operational checks are made to guarantee that the last beam dump has been executed correctly and that the system can be declared to be ‘as good as new’ before the next injection is allowed. The analysis scope comprises the kicker waveforms, redundancy in kicker generator signal paths and different beam instrumentation measurements. [...]
CERN-ATS-2009-021.-
Geneva : CERN, 2010 - 4 p.
Published version from PAC09: PDF;
In : Particle Accelerator Conference 2009, Vancouver, Canada, 04 - 08 May 2009, pp.TU6RFP029
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5.
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Radiation zoning for vacuum equipment of the CERN Large Hadron Collider
/ Mahner, E (CERN) ; Chemli, S (CERN) ; Cruikshank, P (CERN) ; Forkel-Wirth, D (CERN) ; Jiménez, J M (CERN)
Beam losses in high-energy particle accelerators are responsible for beam lifetime degradation. In the LHC beam losses will create a shower of particles while interacting with materials from the beam pipes and surroundings, resulting in a partial activation of material in the tunnel. [...]
CERN-ATS-2009-019.-
Geneva : CERN, 2010 - 4 p.
Published version from PAC09: PDF;
In : Particle Accelerator Conference 2009, Vancouver, Canada, 04 - 08 May 2009, pp.WE6RFP048
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6.
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Measurement of the longitudinal and transverse impedance of kicker magnets using the coaxial wire method
/ Barnes, M J (CERN) ; Caspers, Friedhelm (CERN) ; Kroyer, T (CERN) ; Métral, E (CERN) ; Roncarolo, F (CERN) ; Salvant, B (CERN)
Fast kicker magnets are used to inject beam into and eject beam out of the CERN SPS accelerator ring. These kickers are generally ferrite loaded transmission line type magnets with a rectangular shaped aperture through which the beam passes. [...]
CERN-ATS-2009-018.-
Geneva : CERN, 2010 - 4 p.
Published version from PAC09: PDF;
In : Particle Accelerator Conference 2009, Vancouver, Canada, 04 - 08 May 2009, pp.TU6RFP076
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7.
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Measurement and analysis of SPS kicker magnet heating and outgassing with Different Bunch Spacing
/ Barnes, M J (CERN) ; Caspers, Friedhelm (CERN) ; Cornelis, K (CERN) ; Ducimetière, L (CERN) ; Mahner, E (CERN) ; Papotti, G (CERN) ; Rumolo, G (CERN) ; Senaj, V (CERN) ; Shaposhnikova, E (CERN)
Fast kicker magnets are used to inject beam into and eject beam out of the CERN SPS accelerator ring. These kickers are generally ferrite loaded transmission line type magnets with a rectangular shaped aperture through which the beam passes. [...]
CERN-ATS-2009-017.-
Geneva : CERN, 2010 - 4 p.
Published version from PAC09: PDF;
In : Particle Accelerator Conference 2009, Vancouver, Canada, 04 - 08 May 2009, pp.FR2RAC02
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8.
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LHC Abort Gap Cleaning with the Transverse Damper
/ Gianfelice-Wendt, E (Fermilab) ; Goddard, B (CERN) ; Höfle, Wolfgang (CERN) ; Kain, V (CERN) ; Meddahi, M (CERN) ; Shaposhnikova, E (CERN) ; Koschik, A (Zurich, ETH)
In the Large Hadron Collider, LHC, particles not captured by the RF system at injection or leaking out of the RF bucket may quench the superconducting magnets during beam abort. The problem, common to other superconducting machines, is particularly serious for the LHC due to the very large stored energy in the beam. [...]
CERN-ATS-2009-016.-
Geneva : CERN, 2010 - 4 p.
Fulltext: PDF; Published version from PAC09: PDF;
In : Particle Accelerator Conference 2009, Vancouver, Canada, 04 - 08 May 2009, pp.WE6PFP017
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9.
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Initial results from beam commissioning of the LHC beam dump system
/ Goddard, B (CERN) ; Agapov, I (CERN) ; Carlier, E (CERN) ; Ducimetière, L (CERN) ; Gallet, E (CERN) ; Gyr, M (CERN) ; Jensen, L (CERN) ; Jones, R (CERN) ; Kain, V (CERN) ; Kramer, T (CERN) et al.
Initial commissioning of the LHC beam dump system with beam took place in August and September 2008. The preparation, setting-up and the tests performed are described together with results of the extractions of beam into the dump lines. [...]
CERN-ATS-2009-015.-
Geneva : CERN, 2010 - 4 p.
Published version from PAC09: PDF;
In : Particle Accelerator Conference 2009, Vancouver, Canada, 04 - 08 May 2009, pp.TU6RFP024
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11.
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Machine studies during beam commissioning of the SPS-to-LHC transfer lines
/ Meddahi, M (CERN) ; Agapov, I (CERN) ; Fuchsberger, K (CERN) ; Goddard, B (CERN) ; Herr, Werner (CERN) ; Kain, V (CERN) ; Mertens, V (CERN) ; Missiaen, D (CERN) ; Risselada, Thys (CERN) ; Uythoven, J (CERN) et al.
Through May to September 2008, further beam commissioning of the SPS-to-LHC transfer lines was performed. For the first time, optics and dispersion measurements were also taken in the last part of the lines, and into the LHC. [...]
CERN-ATS-2009-013.-
Geneva : CERN, 2010 - 4 p.
Published version from PAC09: PDF;
In : Particle Accelerator Conference 2009, Vancouver, Canada, 04 - 08 May 2009, pp.TH6PFP040
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12.
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Beam commissioning of injection into the LHC
/ Mertens, V (CERN) ; Agapov, I (CERN) ; Goddard, B (CERN) ; Gyr, M (CERN) ; Kain, V (CERN) ; Kramer, T (CERN) ; Lamont, M (CERN) ; Meddahi, M (CERN) ; Uythoven, J (CERN) ; Wenninger, J (CERN)
The LHC injection tests and first turn beam commissioning took place in late summer 2008, after detailed and thorough preparation. The beam commissioning of the downstream sections of the SPS-to-LHC transfer lines and the LHC injection systems is described. [...]
CERN-ATS-2009-012.-
Geneva : CERN, 2010 - 4 p.
Published version from PAC09: PDF;
In : Particle Accelerator Conference 2009, Vancouver, Canada, 04 - 08 May 2009, pp.TU6RFP026
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14.
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First field test of FiDeL : The magnetic field description for the LHC
/ Bottura, L (CERN) ; Buzio, M (CERN) ; Catalan-Lasheras, N (CERN) ; Deniau, L (CERN) ; Di Castro, M (CERN) ; Fartoukh, S (CERN) ; Giovannozzi, M (CERN) ; Hagen, P (CERN) ; Koutchouk, Jean-Pierre (CERN) ; Lamont, M (CERN) et al.
The start-up of the LHC has provided the first field test for the concept, functionality and accuracy of FiDeL, the Field Description for the LHC. FiDeL provides a parametric model of the transfer function of the main field integrals generated by the series of magnets in the LHC powering circuits, comprising superconducting and normal-conducting main optical elements and high-order harmonic correctors. [...]
CERN-ATS-2009-010.-
Geneva : CERN, 2010 - 4 p.
Fulltext: PDF; Published version from JACoW: PDF;
In : Particle Accelerator Conference 2009, Vancouver, Canada, 04 - 08 May 2009, pp.MO6PFP046
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15.
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Methods to detect faulty splices in the superconducting magnet system of the LHC
/ Bailey, R (CERN) ; Bellesia, B (CERN) ; Catalan Lasheras, N (CERN) ; Dahlerup-Petersen, K (CERN) ; Denz, R (CERN) ; Robles, C (CERN) ; Koratzinos, M (CERN) ; Pojer, M (CERN) ; Ponce, L (CERN) ; Saban, R (CERN) et al.
The incident of 19 September 2008 at the LHC was caused by a faulty inter-magnet splice of about 200 nΩ resistance. Cryogenic and electrical techniques have been developed to detect other abnormal splices, either between or inside the magnets. [...]
CERN-ATS-2009-009.-
Geneva : CERN, 2010 - 4 p.
Fulltext: PDF; Published version from PAC09: PDF;
In : Particle Accelerator Conference 2009, Vancouver, Canada, 04 - 08 May 2009, pp.MO6PFP049
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16.
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Upgrade of the protection system for superconducting circuits in the LHC
/ Denz, R (CERN) ; Dahlerup-Petersen, K (CERN) ; Formenti, F (CERN) ; Meß, K H (CERN) ; Siemko, A (CERN) ; Steckert, J (CERN) ; Walckiers, L (CERN) ; Strait, J (Fermilab)
Prior to the re-start of the Large Hadron Collider LHC in 2009 the protection system for superconducting magnets and bus-bars QPS will be substantially upgraded. The foreseen modifications will enhance the capability of the system in detecting problems related to the electrical interconnections between superconducting magnets as well as the detection of so-called aperture symmetric quenches in the LHC main magnets..
CERN-ATS-2009-008.-
Geneva : CERN, 2010 - 4 p.
Published version from PAC09: PDF;
In : Particle Accelerator Conference 2009, Vancouver, Canada, 04 - 08 May 2009, pp.MO6PFP047
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18.
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Helium II calorimetry for the detection of abnormal resistive zones in LHC sectors
/ Tavian, L (CERN)
Following the incident on a LHC sector due to an electrical arc on the main dipole bus-bar circuit, postmortem analysis of previous current plateaus has shown abnormal temperature drift in the helium II baths of some magnets in the concerned area. In order to identify other possible risky areas, a detection system based on calorimety using available precision cryogenic thermometers has been first validated by applying calibrated heating in the magnet cold-mass and then implemented in the different sectors. [...]
CERN-ATS-2009-006.-
Geneva : CERN, 2010 - 4 p.
Published version from PAC09: PDF;
In : Particle Accelerator Conference 2009, Vancouver, Canada, 04 - 08 May 2009, pp.WE6RFP003
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19.
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Installation and commissioning of vacuum systems for the LHC particle detectors
/ Veness, R (CERN) ; Ramos, D (CERN) ; Lepeule, P (CERN) ; Rossi, A (CERN) ; Schneider, G (CERN) ; Blanchard, S (CERN)
The LHC collider has recently completed commissioning at CERN. At four points around the 27 km ring, the beams are put into collision in the centre of the experiments ALICE, ATLAS, CMS and LHCb which are installed in large underground caverns. [...]
CERN-ATS-2009-005.-
Geneva : CERN, 2010 - 4 p.
Published version from PAC09: PDF;
In : Particle Accelerator Conference 2009, Vancouver, Canada, 04 - 08 May 2009, pp.MO6RFP010
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21.
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Beam Line Design for the CERN Hiradmat Test Facility
/ Hessler, C (CERN) ; Assmann, R (CERN) ; Goddard, B (CERN) ; Meddahi, M (CERN) ; Weterings, W (CERN)
The LHC phase II collimation project requires beam shock and impact tests of materials used for beam intercepting devices. Similar tests are also of great interest for other accelerator components such as beam entrance/exit windows and protection devices. [...]
sLHC-PROJECT-Report-0012; CERN-sLHC-PROJECT-Report-0012.-
Geneva : CERN, 2010 - 4 p.
Published version from PAC09: PDF;
In : Particle Accelerator Conference 2009, Vancouver, Canada, 04 - 08 May 2009, pp.TH6PFP041
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22.
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Resonant Third-Integer Extraction from the PS2
/ Gyr, M (CERN) ; Bartmann, W (CERN) ; Benedikt, M (CERN) ; Goddard, B (CERN) ; Meddahi, M (CERN) ; Koschik, A (Zurich, ETH) ; Mayani Parás, D (Mexico U.)
For the proposed PS2 accelerator several extraction systems are needed, including a slow third-integer resonant extraction. The requirements are presented together with the conceptual considerations for the sextupole locations and strengths, the separatrices at the extraction elements and the aperture implications for the overall machine. [...]
sLHC-PROJECT-Report-0011; CERN-sLHC-PROJECT-Report-0011.-
Geneva : CERN, 2010 - 4 p.
Published version from PAC09: PDF;
In : Particle Accelerator Conference 2009, Vancouver, Canada, 04 - 08 May 2009, pp.TU6RFP027
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23.
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Fast Injection into the PS2
/ Uythoven, J (CERN) ; Bartmann, W (CERN) ; Borburgh, J (CERN) ; Fowler, T (CERN) ; Goddard, B (CERN) ; Meddahi, M (CERN)
The conceptual considerations of a fast injection system for protons and ions in the proposed PS2 accelerator are presented. Initial design parameters of the injection septum and kicker systems are derived, taking into account rise and fall times, apertures and machine optics. [...]
sLHC-PROJECT-Report-0010; CERN-sLHC-PROJECT-Report-0010.-
Geneva : CERN, 2010 - 4 p.
Published version from PAC09: PDF;
In : Particle Accelerator Conference 2009, Vancouver, Canada, 04 - 08 May 2009, pp.TU6RFP030
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24.
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Beam Loss Control for the Unstripped Ions from the PS2 Charge Exchange Injection
/ Bartmann, W (CERN) ; Barranco, J (CERN) ; Benedikt, M (CERN) ; Goddard, B (CERN) ; Kramer, T (CERN) ; Papaphilippou, Y (CERN) ; Vincke, Hel (CERN)
Control of beam losses is an important aspect of the H-injection system for the PS2, a proposed replacement of the CPS in the CERN injector complex. H- ions may pass the foil unstripped or be partially stripped to excited H0 states which may be stripped in the subsequent strong-field chicane magnet. [...]
sLHC-PROJECT-Report-0009; CERN-sLHC-PROJECT-Report-0009.-
Geneva : CERN, 2010 - 4 p.
Published version from PAC09: PDF;
In : Particle Accelerator Conference 2009, Vancouver, Canada, 04 - 08 May 2009, pp.TH6PFP039
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25.
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Laser Stripping for the PS2 Charge-Exchange Injection System
/ Goddard, B (CERN) ; Bartmann, W (CERN) ; Johnson, D (Fermilab) ; Danilov, V (Oak Ridge)
Laser stripping for an H- injection system into the proposed PS2 accelerator could provide an attractive alternative to the use of a conventional stripping foil. In this paper possible concepts for a 4 GeV laser stripping system are outlined and compared, using either laser or magnetic initial stripping steps and a resonant excitation of the intermediate H0 atom, followed by a final magnetic stripping. [...]
sLHC-PROJECT-Report-0008; CERN-TE-2009-003; CERN-sLHC-PROJECT-Report-0008.-
Geneva : CERN, 2010 - 4 p.
Published version from PAC09: PDF;
In : Particle Accelerator Conference 2009, Vancouver, Canada, 04 - 08 May 2009, pp.TU6RFP028
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26.
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The 4 GeV H- Beam Transfer Line from the SPL to the PS2
/ Hessler, C (CERN) ; Eshraqi, M (CERN) ; Goddard, B (CERN) ; Lombardi, A M (CERN) ; Meddahi, M (CERN)
The proposed new CERN injector chain LINAC4, SPL, PS2 will require the construction of new beam transfer lines. A preliminary design has been performed for the 4 GeV SPL to PS2 H- transfer line. [...]
sLHC-PROJECT-Report-0007; CERN-sLHC-PROJECT-Report-0007.-
Geneva : CERN, 2010 - 4 p.
Published version from PAC09: PDF;
In : Particle Accelerator Conference 2009, Vancouver, Canada, 04 - 08 May 2009, pp.TH6PFP042
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27.
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Operational considerations for the PSB H- Injection System
/ Weterings, W (CERN) ; Aiba, M (CERN) ; Borburgh, J (CERN) ; Carli, C (CERN) ; Fowler, T (CERN) ; Goddard, B (CERN)
For the LINAC4 project the PS Booster (PSB) injection system will be upgraded. The 160 MeV Hbeam will be distributed to the 4 superimposed PSB synchrotron rings and horizontally injected by means of an H- charge-exchange system. [...]
sLHC-PROJECT-Report-0006; CERN-sLHC-PROJECT-Report-0006.-
Geneva : CERN, 2010 - 4 p.
Published version from PAC09: PDF;
In : Particle Accelerator Conference 2009, Vancouver, Canada, 04 - 08 May 2009, pp.TU6RFP025
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28.
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Energy Deposition Patterns in the LHC Inner Triplet and Their Impact on the Phase II Luminosity Upgrade
/ Wildner, E (CERN) ; Broggi, F (CERN) ; Cerutti, F (CERN) ; Ferrari, A (CERN) ; Mereghetti, A (CERN) ; Todesco, E (CERN)
Recent studies show that the energy deposition for the LHC Phase I luminosity upgrade, aiming at a peak luminosity 2.5×10**34 cm**-2s**-1, can be handled by appropriate shielding. The Phase II upgrade aims at a further increase of peak luminosity by a factor 4, possibly using Nb$_{3}$Sn quadrupoles. [...]
sLHC-PROJECT-Report-0005; CERN-sLHC-PROJECT-Report-0005.-
Geneva : CERN, 2010 - 4 p.
Published version from PAC09: PDF;
In : Particle Accelerator Conference 2009, Vancouver, Canada, 04 - 08 May 2009, pp.WE6PFP025
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29.
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Study of a less invasive LHC early separation scheme
/ Sterbini, G (CERN)
The LHC Early Separation Scheme consists of a four 8 to 15 T-m dipoles (D0s) installed in the two LHC high luminosity experiments. Its aim, in the framework of LHC Phase II Upgrade, is to improve the luminosity by reducing the crossing angle between the two colliding beams, mitigating and controlling at the same time their parasitic interactions. [...]
sLHC-PROJECT-Report-0004; CERN-sLHC-PROJECT-Report-0004.-
Geneva : CERN, 2010 - 4 p.
Published version from PAC09: PDF;
In : Particle Accelerator Conference 2009, Vancouver, Canada, 04 - 08 May 2009, pp.MO6PFP053
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30.
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Optimization of the powering tests of the LHC superconducting circuits
/ Bellesia, B (CERN) ; Paz Casas Lino, M (CERN) ; Denz, R (CERN) ; Fernandez-Robles, C (CERN) ; Pojer, M (CERN) ; Saban, R (CERN) ; Schmidt, R (CERN) ; Solfaroli Camillocci, M (CERN) ; Thiesen, H (CERN) ; Vergara Fernández, A (CERN)
The Large Hadron Collider has (LHC) 1572 superconducting circuits which are distributed along the eight 3.5 km LHC sectors [1]. Time and resources during the commissioning of the LHC technical systems were mostly consumed by the powering tests of each circuit. [...]
CERN-ATS-2009-072.-
Geneva : CERN, 2010 - 4 p.
Published version from PAC09: PDF;
In : Particle Accelerator Conference 2009, Vancouver, Canada, 04 - 08 May 2009, pp.WE6RFP049
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31.
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Design of the CLIC Quadrupole Vacuum Chambers
/ Garion, C (CERN) ; Kos, H (CERN)
The Compact Linear Collider, under study, requires vacuum chambers with a very small aperture, of the order of 8 mm in diameter, and with a length up to around 2 m for the main beam quadrupoles. To keep the very tight geometrical tolerances on the quadrupoles, no bake out is allowed. [...]
CERN-ATS-2009-133; CLIC-Note-782.-
Geneva : CERN, 2010 - 4 p.
Published version from PAC09: PDF;
In : Particle Accelerator Conference 2009, Vancouver, Canada, 04 - 08 May 2009, pp.MO6RFP007
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32.
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Design, Testing and Operation of the Modulator for the CTF3 Tail Clipper Kicker
/ Barnes, M J (CERN) ; Fowler, T (CERN) ; Ravida, G (CERN)
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 drive beam from the combiner ring (CR, of 35 A magnitude and 140 ns duration, is sent to the new CLic EXperimental area (CLEX). [...]
CERN-ATS-2009-132; CLIC-Note-783.-
Geneva : CERN, 2010 - 4 p.
Published version from PAC09: PDF;
In : Particle Accelerator Conference 2009, Vancouver, Canada, 04 - 08 May 2009, pp.TU6RFP075
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