Author: Murakami, T.M.
Paper Title Page
WEPF17 Development of a Beam Profile Monitor using a Nitrogen-Molecular Jet for the J-PARC MR 848
  • Y. Hashimoto, Y. Hori, T. Toyama
    J-PARC, KEK & JAEA, Ibaraki-ken, Japan
  • T. Fujisawa, T.M. Murakami, K. Noda
    NIRS, Chiba-shi, Japan
  • T. Morimoto, M. Uota
    KEK, Ibaraki, Japan
  • D. Ohsawa
    Kyoto University, Radioisotope Research Center, Kyoto-shi, Japan
  Funding: This work was supported by MEXT/JSPS KAKENHI Grant Number of 24310079 (Grant-in-Aid for Scientific Research(B)).
In order to measure a beam profile with a wide dynamic range covering the halo region around the core region of intense proton beams, a non-destructive beam profile monitor using a sheeted jet beam of nitrogen molecules as a target has been developed for the beam of the J-PARC main ring (MR)*,**. Two-dimensional detection of the beam core will be performed using de-excitation light of the nitrogen molecule. On the other hand, beam halo will be detected using ionized electrons. In the detection of the electrons, aμchannel plate (MCP) will be used for charge multiplication. To achieve a sensitivity of about 10-6, a phosphor screen will be employed for the anode of the MCP, and its light will be detected by photo-multiplier arrays for position resolving. Thus the beam core and halo will be detected simultaneously in this scheme. In this paper summaries of recent progress on the development are discussed as below: 1) the detection efficiency and accuracy in the measurement of the halo region, 2) simulation and experiment results of the high intensity jet beam of 5x10-4 Pa equivalent or more, 3) the specific design of the detector head in the collision point for J-PARC MR.
* Y. Hashimoto, et al., Proc. of IPAC’10, Kyoto, Japan, p.987-989.
** Y. Hashimoto, et al., Proc. of IBIC’12, Tsukuba, Japan.
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