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| TUAZ03 |
The LHC beam collimation
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The Large Hadron Collider (LHC), presently under construction at the European Organization for Nuclear Research (CERN), will accelerate and collide 7 TeV proton beams with an unprecedented stored beam energy of 360 MJ. Handling this large stored energies in a superconducting machine requires a powerful collimation system which should provide a cleaning performance 100 to 1000 times better than what has been achieved in other operating storage rings. The LHC collimation system has also an important role in machine protection in case of system failures. Approximately 90 collimators with be available at the LHC from startup in order to fulfill these requirements. In this paper, the final LHC collimation system is presented. The designs of the various collimators is reviewed and the predicted performance of the overall system is discussed.
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| THBZ01 |
Commissioning of the LHC collimation system
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- S. Redaelli, R. W. Assmann, C. B. Bracco, M. Jonker, G. Robert-Demolaize, Th. Weiler
CERN, Geneva
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The collimation system of the Large Hadron Collider (LHC) will rely on 90 collmators for beam cleaning and machine protection. The full system includes betatron and momentum cleaning collimators, beam absorbers, local protection elements, injection protection devices and transfer line collimators. These collimators must all be coherently adjusted with tight tolerances to small gaps around the beam, at distances from the beam centre that range from 4.5 to 10 betatron beam σs. In particular, the relative rectraction of elements placed in different locations along the 27~km LHC ring must be respected to ensure the required overall cleaning and protection performance. In this paper, the proposed scenarios for commissioning and operating this complex system are discussed. The achievements at SPS with a collimator prototype are also outlined.
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