Physical Review Accelerators and Beams (Feb 2020)

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,
  • Hiromasa Yasuda

DOI
https://doi.org/10.1103/PhysRevAccelBeams.23.022804
Journal volume & issue
Vol. 23, no. 2
p. 022804

Abstract

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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±0.11 ns, which is consistent with the simulation.