Conveners
Session 5 - Other Issues affecting Beam Commissioning II
- Oliver (Chairman) Bruning (AB-ABP)
- Verena (Scientific Secretary) Kain (AB-CO)
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Mr Stephan MAURY (CERN)19/01/2005, 09:00Other Issues affecting Beam Commissioning IIoralThe LHC physics programme with heavy ions (lead-lead) collisions at a luminosity of 1027 cm-2s-1 can be achieved by upgrading the ion injector chain: Linac3-LEIR-PS-SPS. The conversion of the Low Energy Antiproton Ring (LEAR) to a Low Energy Ion Ring (LEIR) has already started. The conversion includes new magnets and power converters, a high-current electron cooling system,...Go to contribution page
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Dr Jan Uythoven (CERN)19/01/2005, 09:20Other Issues affecting Beam Commissioning IIoralThe LHC transfer line TI 8 was commissioned with beam in the autumn of 2004. This talk outlines the tests performed and their conclusions regarding measured beamparameters, optics, beam instrumentation, control system and machine protection system. In the same period the LSS4 extraction c hannel and TT40 line were commissioned with high intensity beams. The important lessons on...Go to contribution page
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Dr Helmut Burkhardt (CERN)19/01/2005, 09:45Other Issues affecting Beam Commissioning IIThe SPS and LHC optics have already changed during the design phase and can be expected to further change during operation. The combined system of SPS, TI 2, TI 8 and the LHC should be well matched to allow for clean injection and minimum emittance blow-up. This implies that the transfer lines have to provide some flexibility. In addition to the requirement to match to the SPS and...Go to contribution page
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Thys RISSELADA (CERN)19/01/2005, 10:10Other Issues affecting Beam Commissioning IIThe matching sections at the SPS and LHC ends of TI8 were designed several years ago. The magnet positions and powering were optimised to match the constraints existing at that time. For various reasons the boundary conditions at both the start and the end of the line have changed. Unfortunately, changes in dispersion cannot easily be absorbed, as the number of individually powered...Go to contribution page
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Verena Kain (CERN)19/01/2005, 10:45Other Issues affecting Beam Commissioning IIThe LHC injection process comprises extraction from the SPS, transfer through the transfer lines TI2 and TI8 and finally injection into the LHC in IR2 and IR8. The nominal intensities foreseen for injection are well over an order of magnitude above the damage limit. Equipment failures resulting in beam loss will therefore cause severe damage to the SPS, the transfer lines or the LHC....Go to contribution page
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Dr Daniela Macina (CERN)19/01/2005, 11:10Other Issues affecting Beam Commissioning IIoralAll four experimental insertion regions will be equipped with movable devices which, in some cases, have to be located very close to the beam. In addition both ALICE and LHCb use spectrometer magnets which distort the beam trajectories. Their effect therefore, has to be compensated locally with dedicated compensation magnets. The location of this experimental equipment and the...Go to contribution page
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Dr Emmanuel Tsesmelis (CERN)19/01/2005, 11:35Other Issues affecting Beam Commissioning IIThis report provides an overview of issues arising at the interface between the LHC machine and the experiments. These issues will be required to guide the interaction between the collider and the experiments when operation of the LHC commences. In particular, the analysis of signals and parameters to be exchanged between the experiments and the accelerator will be presented. Emphasis...Go to contribution page