JPS Conf. Proc. 8, 024005 (2015) [6 pages]
Proceedings of the 2nd International Symposium on Science at J-PARC — Unlocking the Mysteries of Life, Matter and the Universe —
Development of Amplifier and Shaper for High-Rate MWPC
1Department of Physics, Kyoto University, Kyoto 606-8502, Japan
2Research Core for Extreme Quantum World, Okayama University, Okayama 700-8530, Japan
3High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
Received October 13, 2014

A multi-wire proportional chamber (MWPC) will be used as an in-beam charged particle detector for the J-PARC E14 (KOTO) experiment. The maximum counting rate of the MWPC is expected to be up to 1 MHz per channel due to the high neutron and photon flux, expected to be 1 GHz for the 30 × 30 cm2 area. An amplifier to cope with such high counting-rate is required. We developed aprototype of such amplifier, which has a charge preamplifier with the integration time of 3 ns and a pulse shaping part with three pole-zero cancellation networks. The shaper reduced the characteristic long tail lasting tens of microseconds in the signal of MWPC to 150 ns. Its performance has been tested by using a single-channel MWPC which has almost the same geometrical parameters as the MWPC to be installed in the KOTO experiment. put is less than 100 ns almost independent of pulse height, i.e., energy deposit on MWPC. Keywords below should be chosen as they best describe the contents of the paper. Each keyword, except proper nouns and acronyms, should be typed in lower-case letters and followed by a comma.

©2015 The Physical Society of Japan

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