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Sako, H.

Paper Title Page
MOP003 Performance of the Control System for the J-PARC Linac 52
  • H. Yoshikawa, H. Sakaki, T. Suzuki
    JAEA, Ibaraki-ken
  • S.F. Fukuta
    MELCO SC, Tsukuba
  • H. Ikeda
    Visual Information Center, Inc., Ibaraki-ken
  • T. Ishiyama
    KEK/JAEA, Ibaraki-Ken
  • Y.I. Itoh, Y. Kato, M. Kawase, H. Sako, G.B. Shen, H. Takahashi
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
  • S.S. Sawa
    Total Saport System Corp., Naka-gun, Ibaraki

Linac of J-PARC began to operate in November, 2006, and a achieved an initial performance in January, 2007. Afterwards, the beam supply to RCS begins, and it is operating extremely well with stability up to now. Here, the evaluation for comparison of the design and realities of architecture and performance of the LINAC control system are shown. Especially, the conceptual idea of function arrangement in the hierarchy of the control system architecture is shown. Now, the linac control system is in the second phase for the high power beam and reducing the beam loss, and the analysis of the system response identification for the high precision beam control is started.

MOP078 Transverse Beam Matching and Orbit Corrections at J-PARC LINAC 260
  • H. Sako, Y. Kondo, T. Morishita
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
  • H. Akikawa, M. Ikegami
    KEK, Ibaraki
  • T. Ohkawa
    JAEA, Ibaraki-ken
  • A. Ueno
    KEK/JAEA, Ibaraki-Ken

In the design of the very high intensity proton beam of the J-PARC LINAC, precise control of transverse beam dynamics is extremely important for suppression of beam loss. We present results of transverse beam matching and orbit corrections. The linac has 7 matching sections, each of which consists of 4 quadrupole magnets and 4 wire scanners. At 5 matching sections, beam widths at wire scanners are designed to agree with each other. This condition is used in the newly developed algorithm of quadrupole field correction based on a transport model, XAL. Excellent matching performance has been achieved with mismatch factor less than 5% at beam current of 5 to 30 mA. Control of beam parameters from linac into RCS is important for RCS paint injection. Beam studies and comparison to a model have been performed with linac wire scanners combined with multi-wire proportional monitors in the injection line. Orbit corrections with dipole steering magnets based on XAL model have been performed. Orbit deviations were suppressed within 1 mm in horizontal and vertical directions in the whole linac. For these measurements, detailed comparisons to a multi-particle simulation will be shown.


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