A   B   C   D   E   F   G   H   I   J   K   L   M   N   O   P   Q   R   S   T   U   V   W   X   Y   Z  

Allen, C. K.

Paper Title Page
MOPAN029 XAL Online Model Enhancements for J-PARC Commissioning and Operation 218
 
  • C. K. Allen, M. Ikegami
    KEK, Ibaraki
  • H. Ikeda
    Visual Information Center, Inc., Ibaraki-ken
  • T. Ohkawa
    JAEA, Ibaraki-ken
  • H. Sako, G. B. Shen
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
  • A. Ueno
    JAEA/LINAC, Ibaraki-ken
 
  Funding: Work supported by a KEK foreign visiting researcher grant

The XAL application development environment has been installed as a part of the control system for the Japan Proton Accelerator Research Center (J-PARC). XAL was initially developed at SNS and has been described at length in previous conference proceedings (e.g., Chu et. al. APAC07, Galambos et. al. PAC05, etc.). The fundamental tenet of XAL is to provide a consistent, high-level programming interface, along with a set of high-level application tools, all of which are independent of the underlying machine hardware. Control applications can be built that run at any accelerator site where XAL is installed. Of course each site typically has specific needs not supported by XAL and the framework was designed with this in mind: each institution can upgrade XAL which then is accessible to all users. We outline the upgrades and enhancements to the XAL online model necessary for accurate simulation of the J-PARC linac. For example, we have added permanent magnet quadrupoles and additional space charge capabilities such as off-centered and rotated beams and bending magnets with space charge. We present the physics models for the upgrades as well as the software architecture supporting them.

 
MOPAN044 Development of Commissioning Software System for J-PARC LINAC 257
 
  • H. Sako, G. B. Shen
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
  • C. K. Allen
    KEK, Ibaraki
  • H. Ikeda
    Visual Information Center, Inc., Ibaraki-ken
 
  Beam commissioning of J-PARC LINAC has been performed since November 2006. A commissioning software framework and a database system have been developed for the commissioning. We first discuss the LINAC control system, and then our commissioning software framework. Then, we discuss our strategy of comparing online/offline data and models in our system with monitors, magnets, and the RF system. Commissioning tools developed during the commissioning will be presented in detail.  
TUOCC01 Software Tools for Commissioning of the Spallation Neutron Source Linac 883
 
  • J. Galambos, A. V. Aleksandrov, C. K. Allen, S. Henderson, T. A. Pelaia, A. P. Shishlo, Y. Zhang
    ORNL, Oak Ridge, Tennessee
  • P. Chu
    SLAC, Menlo Park, California
 
  Funding: ORNL/SNS is managed by UT-Battelle, LLC, for the U. S. Department of Energy under contract DE-AC05-00OR22725.

The Accelerator Physics group at the Spallation Neutron Source (SNS) has developed numerous codes to assist in the beam commissioning, tuning, and operation of the SNS Linac. These codes have been key to meeting the beam commissioning milestones. For example, a recently developed code provides for rapid retuning of the superconducting Linac in case of RF stations going offline or coming online. Highlights of these "physics applications" will be presented.

 
slides icon Slides  
THPAS009 On the Stability of the Kapchinskij-Vladimirskij Equations 3528
 
  • C. Xu, E. Schuster
    Lehigh University, Bethlehem, Pennsylvania
  • C. K. Allen
    LANL, Los Alamos, New Mexico
 
  The stability of the linearized Kapchinskij-Vladimirskij (KV) equations around a matched solution, which constitute a linear periodic Hamiltonian system, is studied. By using Floquet theorem, symplectic algebra and the eigenvalue distribution theory, a critical stability condition for the linearized particle beam envelope equations is obtained. The stability conditions are expressed in terms of the time-averaged Hamiltonian system.