| Paper |
Title |
Page |
| MOPLS007 |
Monitoring Heavy-ion Beam Losses in the LHC
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544 |
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- R. Bruce, G. Bellodi, H.-H. Braun, S.S. Gilardoni, J.M. Jowett
CERN, Geneva
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The LHC beam loss monitor (BLM) system, primarily designed for proton operation, will survey particle losses and dump the beam if the loss rate exceeds a threshold expected to induce magnet quenches. Simulations of beam losses in the full magnet geometry allow us to compare the response of the BLMs to ion and proton losses and establish preliminary loss thresholds for quenches. Further simulations of beam losses caused by collimation and electromagnetic interactions peculiar to heavy ion collisions determine the positions of extra BLMs needed for ion operation in the LHC.
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| MOPLS009 |
The LHC as a Proton-nucleus Collider
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550 |
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- J.M. Jowett, C. Carli
CERN, Geneva
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Following its initial operation as a proton-proton (p-p) and heavy-ion (208Pb82+ - 208Pb82+) collider, the LHC is expected to operate as a p-Pb collider. Later it may collide protons with other lighter nuclei such as 40Ar18+ or 16O8+. We show how the existing proton and lead-ion injector chains may be efficiently operated in tandem to provide these hybrid collisions. The two-in-one magnet design of the LHC main rings imposes different revolution frequencies for the two beams in part of the magnetic cycle. We discuss and evaluate the consequences for beam dynamics and estimate the potential performance of the LHC as a proton-nucleus collider.
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| MOPLS010 |
Measurement of Ion Beam Losses Due to Bound-free Pair Production in RHIC
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553 |
| |
- J.M. Jowett, S.S. Gilardoni
CERN, Geneva
- R. Bruce
MAX-lab, Lund
- K.A. Drees, W. Fischer, S. Tepikian
BNL, Upton, Long Island, New York
- S.R. Klein
LBNL, Berkeley, California
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When the LHC operates as a Pb82+ ion collider, losses of Pb81+ ions, created through Bound-free Pair Production (BFPP) at the collision point, and localized in cold magnets, are expected to be a major luminosity limit. With Au79+ ions at RHIC, this effect is not a limitation because the Au78+ production rate is low, and the Au78+ beam produced is inside the momentum aperture. When RHIC collided Cu29+ ions, secondary beam production rates were lower still but the Cu28+ ions produced were predicted to be lost at a well-defined location, creating the opportunity for the first direct observation of BFPP effects in an ion collider. We report on measurements of localized beam losses due to BFPP with copper beams in RHIC and comparisons to predictions from tracking and Monte Carlo simulation.
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