Development of a transmittance monitor for high-intensity photon beams

Y. Matsumura, T. Ishikawa, Y. Honda, S. Kido, M. Miyabe, I. Nagasawa, K. Nanbu, H. Shimizu, K. Takahashi, Y. Tsuchikawa, H. Yamazaki

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


A transmittance monitor has been developed for the second tagged-photon beamline at the Research Center for Electron Photon Science, Tohoku University, Japan. In this beamline, an internal radiator is employed to produce the bremsstrahlung photon beam out of circulating electrons in a synchrotron. The transmittance, which is defined as the probability of finding a photon coming to the target position when an electron is detected with a photon-tagging counter, should be determined to deduce cross sections for photo-induced reactions. The developed monitor consists of a telescope of thin plastic scintillators with a positron and electron converter, and a dedicated circuit implemented in a field-programmable gate array chip. The transmittance can be measured with this monitor for high-intensity photon beams corresponding to 20 MHz tagging signals. The measured transmittance is found to be constant with respect to the photon intensity for each photon-tagging channel.

Original languageEnglish
Pages (from-to)103-109
Number of pages7
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Publication statusPublished - 2018 Sept 11


  • FPGA
  • Meson photoproduction
  • Photon transmittance
  • Tagged photon
  • Tagging efficiency


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