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TUO3C01 |
Beam Losses at LHC and its Injector |
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- L. Ponce
CERN, Geneva, Switzerland
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After two years of operation pushing the beam parameters (number of bunches, bunch peak intensity, emittances, β*), we gained substantial experience on the different beam loss mechanisms observed in the LHC all along the beam cycle. Some of these mechanisms were expected like beam losses during injection process and from the collisions. Other mechanisms have been discovered with the higher intensities like beam losses due to UFOs and beam instabilities. Mitigations actions had to be put in place to allow efficient operation. This talk will address the different types of losses (operational beam losses, equipment failure and transient beam losses) as seen in the LHC and in the beam transfer from SPS to LHC.
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Slides TUO3C01 [4.985 MB]
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| WEO1C06 |
Measurement and Simulation of Luminosity Leveling in LHC via Beam Separation |
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- S. Paret, J. Qiang
LBNL, Berkeley, California, USA
- R. Alemany-Fernandez, R. Calaga, R. Giachino, W. Herr, D. Jacquet, G. Papotti, T. Pieloni, L. Ponce, M. Schaumann
CERN, Geneva, Switzerland
- R. Miyamoto
ESS, Lund, Sweden
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Funding: This work supported by the US LHC Accelerator Research Program and the National Energy Research Scientific Computing Center of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231.
Leveling of the luminosity in LHC by means of separating the beams colliding at an interaction point is examined. An experiment in which the separation of the beams was stepwise increased to up to 2.5 times the beam width is presented. The luminosity at all IPs and emittance of the beams were measured to detect possible side effects of the collision with an offset. Strong-strong simulations that closely follow the experimental setup are discussed and compared with the measurements. Finally, potential alternatives for luminosity leveling are briefly described.
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Slides WEO1C06 [1.031 MB]
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