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

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• 作者：T. Ishikawa^a ; ^{ishikawa@lns.tohoku.ac.jp" class="auth_mail" title="E-mail the corresponding author} ; H. Fujimura^a ; ¹ ; H. Hamano^b ; R. Hashimoto^a ; ² ; Y. Honda^a ; T. Ishida^a ; S. Kaida^a ; H. Kanda^c ; S. Kido^a ; Y. Matsumura^a ; M. Miyabe^a ; K. Mizutani^d ; I. Nagasawa^a ; A. Nakamura^a ; K. Nanbu^a ; K. Nawa^a ; S. Ogushi^a ; Y. Shibasaki^a ; H. Shimizu^a ; H. Sugai^a ; ³ ; K. Suzuki^a ; ⁴ ; K. Takahashi^a ; S. Takahashi^a ; Y. Taniguchi^a ; A.O. Tokiyasu^a ; Y. Tsuchikawa^a ; H. Yamazaki^a ; ⁵
• 关键词：Beam profile monitor ; Tagged photon beam ; Meson photo-production
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：2016
• 出版时间：1 March 2016
• 年：2016
• 卷：811
• 期：Complete
• 页码：124-132
• 全文大小：1216 K

文摘

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 $3\times 3{\mathrm{mm}}^2$. 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%)$(~100\%)$ can be achieved with this monitor for high-intensity photon beams corresponding to 20 MHz tagging signals.