A neutral-beam profile monitor with a phosphor screen and a high-sensitivity camera for the J-PARC KOTO experiment

T. Matsumura, I. Kamiji, K. Nakagiri, H. Nanjo, T. Nomura, Noboru Sasao, T. Shinkawa, K. Shiomi

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We have developed a beam-profile monitor (BPM) system to align the collimators for the neutral beam-line at the Hadron Experimental Facility of J-PARC. The system is composed of a phosphor screen and a CCD camera coupled to an image intensifier mounted on a remote control X–Y stage. The design and detailed performance studies of the BPM are presented. The monitor has a spatial resolution of better than 0.6 mm and a deviation from linearity of less than 1%. These results indicate that the BPM system meets the requirements to define collimator-edge positions for the beam-line tuning. Confirmation using the neutral beam for the KOTO experiment is also presented.

Original languageEnglish
Pages (from-to)91-97
Number of pages7
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Publication statusPublished - Mar 21 2018



  • Beam profile
  • Image intensifier
  • J-PARC
  • KOTO
  • Neutral beam

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

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