A fast profile monitor with scintillating fiber hodoscopes for high-intensity photon beams

T. Ishikawa, H. Fujimura, H. Hamano, R. Hashimoto, Y. Honda, T. Ishida, S. Kaida, H. Kanda, S. Kido, Y. Matsumura, M. Miyabe, K. Mizutani, I. Nagasawa, A. Nakamura, K. Nanbu, K. Nawa, S. Ogushi, Y. Shibasaki, H. Shimizu, H. SugaiK. Suzuki, K. Takahashi, S. Takahashi, Y. Taniguchi, A. O. Tokiyasu, Y. Tsuchikawa, H. Yamazaki

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)


A fast beam-profile monitor has been developed for high-energy photon beamlines at the Research Center for Electron Photon Science, Tohoku University. The position of the photon converted into an electron-positron pair in a 0.5 mm-thick aluminum plate is measured with two hodoscopes made of scintillating fibers with cross-sections of 3×3mm2. Events in which charged particles are produced upstream are rejected with a charge veto plastic scintillator placed in front of the plate, and pair-production events are identified with a trigger plastic scintillator placed behind the plate. The position is determined by a developed logic module with a field-programmable gate array. The dead time for processing an event is 35 ns, and a high data acquisition efficiency (~100%) can be achieved with this monitor for high-intensity photon beams corresponding to 20 MHz tagging signals.

Original languageEnglish
Pages (from-to)124-132
Number of pages9
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Publication statusPublished - 2016 Mar 1


  • Beam profile monitor
  • Meson photo-production
  • Tagged photon beam


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