Beams Document 1185-v1

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Beam-Induced Damage to the Tevatron Collimators: Analysis and Dynamic Modeling of Beam Loss, Energy Deposition and Ablation

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Submitted by:
Nikolai Mokhov
Updated by:
Nikolai Mokhov
Document Created:
01 Jun 2004, 15:15
Contents Revised:
01 Jun 2004, 15:15
Metadata Revised:
02 Jun 2008, 17:33
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Thorough analysis is performed on beam-induced damage to
components of the Tevatron superconducting collider occurred in
December 2003. The damage was induced by a failure in the CDF Roman Pot
detector positioning at the end of a 980x980 GeV proton-antiproton
colliding beam store. Possible scenarios of this failure, including
excessive halo generation and superconducting magnet quenching,
are studied via realistic simulations using the STRUCT and MARS14
codes. It is shown that the interaction of a misbehaved proton beam
with the collimators result in rapid local heating.
A detailed consideration is given to the ablation process
for the collimator material taking place in high vacuum. It is
shown that ablation of the tungsten (primary collimator) and stainless steel
(secondary collimator) jaws results in the creation of a groove in the
jaw surface as observed after the December accident.
Analysis and simulations performed show that we have a good understanding
of the entire picture, both on dynamics and material damage sides.
Calculated parameters of the grooves created in the collimators
are very similar to those observed after the accident.
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