High-rate performance of a time projection chamber for an H-dibaryon search experiment at J-PARC
High-rate performance of a time projection chamber for an H-dibaryon search experiment at J-PARC
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J-PARC 氢二重子搜索实验时间投影室的高性能
DOI:
10.1016/j.nima.2019.06.050
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发表时间:
2019
期刊:
影响因子:
--
通讯作者:
Yoshida J.
中科院分区:
文献类型:
--
作者:
Kim S.H.;Ichikawa Y.;Sako H.;Ahn J.K.;Akaishi T.;Ashikaga S.;Choi S.W.;Ekawa H.;Hasegawa S.;Hayakawa S.;Jung W.S.;Kang B.M.;Lee J.Y.;Nanamura T.;Sato S.;Shirotori K.;Suzuki K.;Tanida K.;Yang S.B.;Yoshida J.
We have developed a gas electron multiplier (GEM)-based time projection chamber (TPC) for the H-dibaryon search experiment at J-PARC. High-rate K− beam particles enter a TPC gas volume of approximately 0.2 m 3, in a direction perpendicular to the electric field. A long-rectangular hollow section is located inside the TPC volume to accommodate a diamond target. We commissioned the TPC using 230-MeV protons with beam rates of up to 1 MHz. The TPC data acquisition system collected 5768 pad signals in full readout mode, with almost 100% efficiency, at a preset trigger rate of 230 Hz. We operated the TPC in an Ar/CH 4 gas mixture (90/10) without a magnetic field. The spatial resolutions on the pad plane are measured to be 400–700 μ m, which correspond to 230–300 μ m in a magnetic field of 1 T. We confirmed high tracking capability at beam rates of up to 1 MHz.