Performance evaluation of electron multiplier tubes as a high-intensity muon beam monitor
arxiv(2024)
摘要
Upgrade work towards increasing the beam intensity of the neutrino production
beamline at J-PARC is underway. Tertiary muon beam monitoring is essential for
stable operation of the beamline. Accordingly, we are planning to replace the
present muon monitor detectors with electron multiplier tubes (EMTs). We
investigated the linearity and radiation tolerance of EMTs using a 90 MeV
electron beam at the Research Center for Electron Photon Science. EMTs show
higher radiation tolerance than the Si sensors which are presently used as one
of the muon monitor detectors for the T2K long-baseline neutrino oscillation
experiment at J-PARC. The signal yield decrease is found to be less than 10
after a beam irradiation equivalent to 132-days of operation at the future
J-PARC beam power of 1.3 MW. The observed yield decrease is likely due to
dynode deterioration, based on the results of a detailed investigation. The
studies described here confirm that EMTs can be used as a high-intensity muon
beam monitor.
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