Author: Ichikawa, A.
Paper Title Page
MOPMB025 The Development of 16-Electrode Monitor for Measurement of the Multipole-Moment 140
  • Y. Nakanishi, A. Ichikawa, A. Minamino, K.G. Nakamura, T. Nakaya
    Kyoto University, Kyoto, Japan
  • T. Koseki, H. Kuboki
    KEK, Tokai, Ibaraki, Japan
  • T. Toyama
    J-PARC, KEK & JAEA, Ibaraki-ken, Japan
  Funding: This work was supported by MEXT KAKENHI Grant Number 25105002, Grant-in-Aid for Scientific Research on Innovative Areas titled 'Unification and Development of the Neutrino Science Frontier'
In the J-PARC main ring, the beam intensity is greatly increased to 750 kW or more in near future. Even the beam intensity become higher, the beam loss must be kept at the same level as present. Aiming to make the cause of beam loss clear, we have been developing the beam monitor to measure the beam size. The quadrupole moment is related to the beam size. In principle, monitors with more than four electrodes can measure the quadrupole moment. In addition, two monitors located at the places with different beta functions can measure the emittances and beam sizes, providing the horizontal and vertical beta functions. To obtain more precise quadrupole moment and higher multipoles, we are developing the multi-electrode monitor, tentatively, with 16 electrodes. As a reference of 16-electrode monitor, two 4-electrode BPMs are investigated to measure quadrupole moments. We will present the measurement result of 4-electrode monitors and the status of the development of the 32-electrode monitor.
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMB025  
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