Performance Evaluation of Readout Electronics Board for the COMET Straw-Tube Tracker

Authors

Hiroshi Yamaguchi¹^,², Tatsuya Hayashi²^,³, Masahiro Ikeno²^,⁴, Satoshi Mihara²^,⁴, Hajime Nishiguchi⁴, Keita Okamoto²^,³, Manobu Tanaka²^,⁴, Junji Tojo¹^,², Tomohisa Uchida²^,⁴, and Kazuki Ueno²^,⁴

Affiliations

¹Department of Physics, Kyushu University, Fukuoka 812-8581, Japan

²Open-it, Institute of Particle and Nuclear Studies, KEK, Tsukuba, Ibaraki 305-0801,

Japan

³Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan

⁴Institute of Particle and Nuclear Studies, KEK, Tsukuba, Ibaraki 305-0801, Japan

Institute of Particle and Nuclear Studies, KEK, Tsukuba, Ibaraki 305-0801, Japan

Journal

Published Date

DOI

Abstract

We report results of performance evaluation of a front-end readout electronics board named “ROESTI” for the COMET straw tube tracker. The ROESTI performs preamplification, pulse-shaping, discrimination and waveform digitization. All the processes are controlled by an FPGA chip on the board. To achieve four orders of magnitudes better sensitivity than the current limit of the 𝜇-e conversion search, we require momentum resolution of electron reconstruction better than 200 keV/c at 105 MeV/c in high rate environment. The ROESTI board has a function of waveform digitization by implementing the DRS4 chips on it. Consequently, the waveforms coming from pile-up events can be separated into each waveform. We have conducted performance evaluation of the ROESTI in terms of noise level, gain, linearity, timing resolution and data transfer speed. We report research and development status of the next version of the board to be implemented in the COMET experiment.