| Paper |
Title |
Page |
| TUAZ02 |
High-Intensity Beam Collimation and Targetry
|
74 |
| |
- N. V. Mokhov
Fermilab, Batavia, Illinois
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| |
Principles, design criteria and realization are described for reliable collimation systems for the high-power accelerators (Fermilab Booster and Main Injector, SNS, J-PARC), hadron colliders (Tevatron and LHC) and e+e- linear colliders (ILC). Factors affecting the expected and achieved collimation performances are analyzed. Functionality of collimators as the key elements of the machine protection system are considered using as an example a recent beam accident case in the Tevatron. A substantial progress on the crystal collimation front is described. The key issues are considered in design of high-power target systems and achieving their best performance. Simulation code requirements and recent benchmarking results are presented. A status of conventional neutrino targets and neutrino factory target concepts is described along with performed and planned beam tests. Overview of the target and collimator material beam tests concludes this report.
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| TUBZ04 |
Experimental Studies of Targets and Collimators for High Intensity Beams
|
143 |
| |
- N. Simos, H. G. Kirk, J. G. O Conor
BNL, Upton, Long Island, New York
- K. T. McDonald
PU, Princeton, New Jersey
- N. V. Mokhov
Fermilab, Batavia, Illinois
- L. P. Trung
Stony Brook University, Stony Brook
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| |
Intense muon or neutrino beams require high-performance targets intercepting multi MW proton beams. To achieve it one must push the envelope of the current knowledge regarding material behavior and endurance for both short and long exposure. It is also true for collimator structures intercepting the halo of the intense beam under normal or the entire beam during off-normal conditions. The limitations of most materials in playing such pivotal roles have led to an extensive search and experimentation with new alloys and composites that, at first glance, appear to possess the right combination of properties satisfying target and /or collimation requirements. In this study, a number of new and “smart” materials are experimentally evaluated for resilience to radiation damage and potential use in target and collimation schemes. These include targets for the muon collider and the neutrino superbeam as well as LHC collimation. Results of the on-going experimental effort under way at BNL and involving heavy irradiation of candidate materials using 200 MeV proton beams and post-irradiation analysis for irradiation damage assessment will be presented.
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| WEAZ04 |
Beam-Induced Damage to the Tevatron Components and What Has Been Done About It
|
205 |
| |
- N. V. Mokhov, P. Czarapata, A. I. Drozhdin, D. Still
Fermilab, Batavia, Illinois
- V. Samulyak
BNL, Upton, Long Island, New York
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| |
The Tevatron collimators and magnets were damaged and two thirds of the superconducting ring were quenched on December 5, 2003, induced by a failure in the CDF Roman Pot detector positioning at the end of a 2-TeV proton-antiproton colliding beam store. Analysis of a failure in the abort kicker AC distribution, and detailed modeling of a misbehaved beam dynamics, induced energy deposition and ablation process in the collimator material, have provided a good understanding of the event. The improvements to the detectors, Tevatron quench protection and beam loss monitor systems to avoid such an accident in the future are described.
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|
| FRAP03 |
Summary of Working Group C+G (Part I)
|
365 |
| |
- N. V. Mokhov
Fermilab, Batavia, Illinois
- K. Hasegawa
JAEA, Ibaraki-ken
- S. Henderson
ORNL, Oak Ridge, Tennessee
- R. Schmidt
CERN, Geneva
- M. Tomizawa
KEK, Ibaraki
- K. Wittenburg
DESY, Hamburg
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