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Arakawa, D.A.

Paper Title Page
WEO2A01 Multi-Ribbon Profile Monitor Using Carbon Graphite Foil for J-PARC 429
  • Y. Hashimoto, T. Toyama
    J-PARC, KEK & JAEA, Ibaraki-ken
  • D.A. Arakawa, Y. Hori, S. Muto, Y. Saito, M. Uota, Y. Yamanoi
    KEK, Tsukuba
  • M. Mitani
    MINOTOS, Kunitachi, Tokyo Metropolitan
  • T. Morimoto
    Morimoto Engineering, Iruma, Saitama
  • D. Ohsawa
    Kyoto University, Radioisotope Research Center, Kyoto-shi
  • S. Ohya
    UBE, Ichihara, Chiba
  • Y. Sato
    NIRS, Chiba-shi
  • M.J. Shirakata
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken

We developed a secondary emission type beam profile monitor with multi ribbon target made of a carbon graphite foil. The carbon graphite foil is excellent in endurance against heat load, and its thickness as 1.6-3.0 micron and low z (=6) are advantage for reducing beam loss. Intense bunch up to 1013 particle per bunch has been measured. Furthermore, the ribbon emits larger amount of electrons than ordinal metal wires because of its larger surface. Therefore the monitor has higher sensitivity, and transverse beam tail has been observed clearly. The monitors were installed in injection transport and injection point of main ring in J-PARC, in order to measure beam profiles by single passing. Normal size target has 32ch ribbons with 2 or 3 mm in width and their length is 200 mm or more each. In this report, target fabrication, basic characteristics of the carbon graphite target, and results of beam measurement will be discussed.


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