Development of a bunch-width monitor for low-intensity muon beam below a few MeV

Open Access

Development of a bunch-width monitor for low-intensity muon beam below a few MeV

Yuki Sue, Mai Yotsuzuka, Kenta Futatsukawa, Kazuo Hasegawa, Toru Iijima, Hiromi Iinuma, Kenji Inami, Katsuhiro Ishida, Naritoshi Kawamura, Ryo Kitamura, Yasuhiro Kondo, Tsutomu Mibe, Yasuhiro Miyake, Takatoshi Morishita, Yuga Nakazawa, Masashi Otani, Naohito Saito, Koichiro Shimomura, Yusuke Takeuchi, Takahiro Ushizawa, Takayuki Yamazaki, and Hiromasa Yasuda

Phys. Rev. Accel. Beams 23, 022804 – Published 12 February 2020

Abstract

A destructive monitor to measure the longitudinal bunch width of a low-energy and low-intensity muon beam was developed. This bunch-width monitor (BWM) employed microchannel plates to detect a single muon with high time resolution. In addition, constant-fraction discriminators were adopted to suppress the time-walk effect. The time resolution was measured to be 65 ps in rms using a picosecond-pulsed laser. This resolution satisfied the requirements of the muon linac of the J-PARC E34 experiment. We measured the bunch width of negative-muonium ions ( $μ^{+} e^{-} e^{-}$ ) accelerated with a radio-frequency quadrupole using the BWM. The bunch width was successfully measured to be $σ = 0.54 \pm 0.11 ns$ , which is consistent with the simulation.

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Received 1 December 2019
Accepted 21 January 2020

DOI:https://doi.org/10.1103/PhysRevAccelBeams.23.022804

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Beam diagnostics

Accelerators & Beams

Authors & Affiliations

Yuki Sue ^1,*, Mai Yotsuzuka ¹, Kenta Futatsukawa², Kazuo Hasegawa³, Toru Iijima^1,4, Hiromi Iinuma⁵, Kenji Inami¹, Katsuhiro Ishida⁶, Naritoshi Kawamura ², Ryo Kitamura³, Yasuhiro Kondo^3,5, Tsutomu Mibe², Yasuhiro Miyake², Takatoshi Morishita³, Yuga Nakazawa ⁵, Masashi Otani ², Naohito Saito⁷, Koichiro Shimomura², Yusuke Takeuchi ⁸, Takahiro Ushizawa⁹, Takayuki Yamazaki², and Hiromasa Yasuda ¹⁰

¹Graduate School of Science, Nagoya University, Nagoya, Aichi 464-8602, Japan
²High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
³Japan Atomic Energy Agency (JAEA), Tokai, Naka, Ibaraki 319-1195, Japan
⁴Kobayashi-Maskawa Institute (KMI), Nagoya University, Nagoya, Aichi 464-8602, Japan
⁵Graduate School of Science and Engineering, Ibaraki University, Mito, Ibaraki 310-8512, Japan
⁶Riken, Wako, Saitama 351-0198, Japan
⁷J-PARC Center, Tokai, Naka, Ibaraki 319-1195, Japan
⁸Graduate School of Science, Kyushu University, Fukuoka 819-0395, Japan
⁹SOKENDAI (The Graduate University for Advanced Studies), Hayama, Kanagawa 240-0193, Japan
¹⁰Graduate School of Science, University of Tokyo, Hongo, Tokyo 171-8501, Japan

^*ysue@hepl.phys.nagoya-u.ac.jp

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Issue

Vol. 23, Iss. 2 — February 2020

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