Paper |
Title |
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WEPMW007 |
Validation of Off-momentum Cleaning Performance of the LHC Collimation System |
2427 |
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- B. Salvachua, P. Baudrenghien, R. Bruce, H. Garcia, P.D. Hermes, S. Jackson, M. Jaussi, A. Mereghetti, D. Mirarchi, S. Redaelli, H. Timko, G. Valentino, A. Valloni
CERN, Geneva, Switzerland
- R. Kwee-Hinzmann
Royal Holloway, University of London, Surrey, United Kingdom
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The LHC collimation system is designed to provide effective cleaning against losses coming from off-momentum particles, either due to un-captured beam or to an unexpected RF frequency change. For this reason the LHC is equipped with a hierarchy of collimators in IR3: primary, secondary and absorber collimators. After every collimator alignment or change of machine configuration the off-momentum cleaning efficiency is validated with loss maps at low intensity. We describe here the improved technique used in 2015 to generate such loss maps without completely dumping the beam into the collimators. The achieved performance of the collimation system for momentum cleaning is reviewed.
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DOI • |
reference for this paper
※ DOI:10.18429/JACoW-IPAC2016-WEPMW007
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WEPOY045 |
Benchmarking the Beam Longitudinal Dynamics Code BLonD |
3094 |
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- H. Timko, J.F. Esteban Müller, A. Lasheen, D. Quartullo
CERN, Geneva, Switzerland
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The relatively recent Beam Longitudinal Dynamics code BLonD has already been applied to a wide range of studies for all present CERN synchrotrons. Its application area ranges from studies of RF manipulations, over single and multi-bunch interactions with impedance, to the action of feedback loops and RF noise. In this paper, we present benchmarks and comparisons with measurements, theory, or other codes, which have increased greatly the trust in the code. Tests related to bunch-to-bucket transfer, feedback loops, diffusion due to noise injection, as well as collective effects, are presented.
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DOI • |
reference for this paper
※ DOI:10.18429/JACoW-IPAC2016-WEPOY045
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