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Journal Articles

GEM-MSTPC; An Active-target type detector in low-pressure He/CO$$_{2}$$ mixed gas

Ishiyama, Hironobu*; Yamaguchi, Kanako*; Mizoi, Yutaka*; Watanabe, Yutaka*; Das, S. K.*; Hashimoto, Takashi*; Miyatake, Hiroari*; Hirayama, Yoshikazu*; Imai, Nobuaki*; Oyaizu, Mitsuhiro*; et al.

Journal of Instrumentation (Internet), 7(3), p.C03036_1 - C03036_14, 2012/03

 Times Cited Count:8 Percentile:36.47(Instruments & Instrumentation)

We developed an active-target type gas counter operating with low He/CO$$_{2}$$ (10%) detector gas for application in studying low-energy nuclear reactions using radioactive beams. A 400-$$mu$$m-thick gas electron multiplier (THGEM) was used as the proportional counter for high injection rate capability. We examined the gas gain stability and the influence of ion feedback on particle tracks at high beam injection rates of up to 10$$^{5}$$ particles per second (pps) using a low-energy $$^{12}$$C beam. From the result of this examination, we found that the THGEM was found to be applicable for our active target at high injection rates of up to 10$$^{5}$$ pps.

Oral presentation

Development of GEM-TPC with gating grid for J-PARC hadron experiment

Sugimura, Hitoshi; Imai, Kenichi; Sako, Hiroyuki; Sato, Susumu; Ichikawa, Yudai

no journal, , 

We are now developing a new time projection chamber (TPC) surrounding a target to measure the emitted particles of short flight lengths under a high beam rate. The prototype of the TPC with GEM readout has been developed. The effective area is about 100mm $$times$$ 100mm $$times$$ 300mm (drift direction) and Beam particles go through the TPC perpendicular to the drift direction. A signal is amplified with three layers of GEM sheet and read out with anode pads of various sizes for the study of the TPC properties. The goal of particle rate at the TPC is over $$10^7$$ Hz. In order to operate under such high counting rate, we adopted a gating grid opened by an appropriate trigger. We have tested the TPC by using an electron beam at the Research Center for Electron Photon Science, Tohoku University. We report the results of the test experiment.

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