Beams Document 2564-v1

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BEAM-INDUCED DAMAGE TO THE TEVATRON COMPONENTS AND WHAT HAS BEEN DONE ABOUT IT

Document #:
Beams-doc-2564-v1
Document type:
Proceeding
Submitted by:
Nikolai Mokhov
Updated by:
Nikolai Mokhov
Document Created:
27 Nov 2006, 14:44
Contents Revised:
27 Nov 2006, 14:44
Metadata Revised:
23 May 2007, 10:48
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Abstract:
A beam-induced damage to the Tevatron collimators happened in December 2003 was induced by a failure in the CDF Roman Pot detector positioning during the collider run. Possible
scenarios of this failure resulted in an excessive halo generation and superconducting magnet quench have been 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 a rapid local heating and a possible damage. A detailed consideration is given to the ablation process for the collimator material taking place in high vacuum. It is shown that ablation of tungsten (primary collimator) and stainless steel (secondary collimator) jaws results in creation of a groove in the jaw surface as was observed after the December's accident. The actions undertaken to avoid such an accident in future are described in detail.
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