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Chow, K.

Paper Title Page
WEPMS024 Upgrades to the DAHRT Second Axix Induction Cells 2385
  • K. Nielsen, J. Barraza, M. Kang
    LANL, Los Alamos, New Mexico
  • F. M. Bieniosek, K. Chow, W. M. Fawley, E. Henestroza, L. R. Reginato, W. L. Waldron
    LBNL, Berkeley, California
  • R. J. Briggs, B. A. Prichard
    SAIC, Los Alamos, New Mexico
  • T. E. Genoni, T. P. Hughes
    Voss Scientific, Albuquerque, New Mexico
  The Dual-Axis Radiographic Hydrodynamics Test (DARHT) facility will employ two perpendicular electron Linear Induction Accelerators to produce intense, bremsstrahlung x-ray pulses for flash radiography. The second axis, DARHT II, features a 3-MeV injector and a 15-MeV, 2-kA, 1.6-microsecond accelerator consisting of 74 induction cells and drivers. Major induction cell components include high flux swing magnetic material (Metglas 2605SC) and a MycalexTM insulator. The cell drivers are pulse forming networks (PFNs). The DARHT II accelerator cells have undergone a series of test and modeling efforts to fully understand their operational parameters. Physical changes in the cell oil region, the cell vacuum region, and the cell drivers, together with different operational and maintenance procedures, have been implemented in the prototype. A series of prototype acceptance tests have demonstrated that the required cell lifetime is met at the increased performance levels. Shortcomings of the original design are summarized and improvements to the design, their resultant enhancement in performance, and various test results are discussed.  
FRPMN067 Collision Rate Monitors for LHC 4171
  • E. Bravin, S. Burger, C. Dutriat, T. Lefevre, V. Talanov
    CERN, Geneva
  • A. Brambilla, M. Jolliot, S. Renet
    CEA, Grenoble
  • J. M. Byrd, K. Chow, H. S. Matis, M. T. Monroy, A. Ratti, W. C. Turner
    LBNL, Berkeley, California
  Collision rate monitors are essential in bringing particle beams into collision and optimizing the performances of a collider. In the case of LHC the relative luminosity will be monitored by measuring the flux of small angle neutral particles produced in the collisions. Due to the very different luminosity levels at the four interaction regions (IR) of LHC two different types of monitors have been developed. At the high luminosity IR (ATLAS and CMS) fast ionization chambers will be installed while at the other two (ALICE and LHC-b) solid state polycrystalline Cadmium Telluride (CdTe) detectors will be used. The ionization chambers are being developed by Lawrence Berkeley National Lab (Berkeley CA, USA) while the CdTe monitors are being developed by CERN and CEA-LETI (Grenoble, FR) This paper describes the system with particular emphasis on the monitors based on CdTe detectors, detailed description of the ionisation chambers being available in separate papers.