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Mokhov, N. V.

Paper Title Page
TUAZ02 High-Intensity Beam Collimation and Targetry 74
 
  • N. V. Mokhov
    Fermilab, Batavia, Illinois
 
  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.  
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
 
  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.  
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
 
  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.  
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