Development of amplifier with pulse shaper for high rate MWPC

I. Kamiji, Noboru Sasao, T. Nomura, H. Nanjo, Takahiko Masuda, N. Kawasaki, D. Naito, Y. Maeda, S. Seki, K. Nakagiri, S. Shinohara

Research output: Contribution to journalArticle

Abstract

An amplifier has been developed for wire chambers used as an in-beam detector for charged particles in the KOTO experiment, which aims at discovering a CP-violating rare decay of long-lived neutral K meson, KL → p0νν Due to in-beam condition of the wire chambers, the maximum counting rate is estimated to reach 700 kHz per channel. Because the output signals of the wire chambers have a long tail of low frequency components coming from slow drift of ions which remains tens of microseconds, pulse pile-up and baseline fluctuation are expected in such a high rate operation. In order to suppress these undesirable phenomena, a pulse shaping circuit was integrated into the signal amplifier for the wire chamber, which consists of three pole-zero cancellation networks. The performance of the pulse shaping circuit was confirmed by using a prototype single-channel MWPC. The achieved pulse width was 40% of the original one in FWHM. The total pulse width was 150 ns, where any long tail exceeding the total width vanished.

Original languageEnglish
Article number080
JournalProceedings of Science
Volume25-29-May-2015
Publication statusPublished - 2015
Externally publishedYes

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    Kamiji, I., Sasao, N., Nomura, T., Nanjo, H., Masuda, T., Kawasaki, N., Naito, D., Maeda, Y., Seki, S., Nakagiri, K., & Shinohara, S. (2015). Development of amplifier with pulse shaper for high rate MWPC. Proceedings of Science, 25-29-May-2015, [080].