| Paper |
Title |
Page |
| MOPLT114 |
Modeling of Beam Loss in Tevatron and Backgrounds in the BTeV Detector
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803 |
| |
- A. Drozhdin, N. Mokhov
Fermilab, Batavia, Illinois
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Detailed STRUCT simulations are performed of beam loss rates in the vicinity of the BTeV detector in the Tevatron C0 interaction region due to beam-gas nuclear elastic interactions, outscattering from the collimator jaws and an accidental abort kicker prefire. Corresponding showers induced in the machine components and background rates on the BTeV Detector are modeled with the MARS14 code. It is shown that a steel mask located in front of the last four dipoles upstream the C0 can reduce the accelerator-related background rates in the detector by an order of magnitude.
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| MOPLT115 |
Numerical Simulations and Analyses of Beam-Induced Damage to the Tevatron Collimators
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806 |
| |
- A. Drozhdin, N. Mokhov, D. Still
Fermilab, Batavia, Illinois
- V. Samulyak
BNL, Upton, Long Island, New York
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Numerical simulations are performed to analyze the Tevatron collimator damage happened in December 2003 that 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 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 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.
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