Performance evaluation of a silicon strip detector for positrons/electrons from a pulsed a muon beam
Performance evaluation of a silicon strip detector for positrons/electrons from a pulsed a muon beam
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脉冲 μ 子束正电子/硅带探测器的性能评估
DOI：
10.1088/1748-0221/15/04/p04027
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发表时间：
2020
影响因子：
1.3
通讯作者：
Ushizawa T
中科院分区：
文献类型：
--
作者：
Aoyagi T.;Honda Y.;Ikeda H.;Ikeno M.;Kawagoe K.;Kohriki T.;Kume T.;Mibe T.;Namba K.;Nishimura S.;Saito N.;Sasaki O.;Sato N.;Sato Y.;Sendai H.;Shimomura K.;Shirabe S.;Shoji M.;Suda T.;Suehara T.;Takatomi T.;Tanaka M.;Tojo J.;Tsukada K.;Uchida T.;Ushizawa T
日本质子加速器研究综合体（J-PARC）正在提供高强度脉冲μ子束。人们提出了许多利用这种高强度μ子束进行基础物理研究的实验。测量μ子磁矩异常（g− 2）和μ子电偶极矩（EDM）的实验就是其中之一，它需要一个跟踪μ子衰变产生的正电子的探测器。在探测器中需要精细的分割以容忍高比率的正电子。时间分辨率要求远优于μ子反常自旋进动周期，而前端电子器件的缓冲深度需要远长于加速μ子寿命。该探测器的要求还满足J-PARC的μ素超精细结构间隔测量和东北大学测量质子电荷半径的另一个实验的要求。我们开发了一个190 μm间距的单面硅条传感器，一个采样率为200 MHz、缓冲存储器深度为8192的前端电子设备，以及一个基于DAQ中间件的数据采集系统，用于J-PARC μ on g− 2/EDM实验。我们已经制作了由该传感器和前端电子器件组成的检测器模块。在东北大学的实验室和使用正电子束的束测试中评估了制造的探测器模块的性能。该探测器被确认为满足实验的所有要求，除了时间行走，这将是解决的前端电子的下一个版本。
A high-intensity pulsed muon beam is becoming available at the at the Japan Proton Accelerator Research Complex (J-PARC). Many experiments to study fundamental physics using this high-intensity muon beam are proposed. An experiment to measure the muon magnetic moment anomaly (g− 2) and the muon electric dipole moment (EDM) is one of these experiments and it requires a tracking detector for positrons from muon decay. Fine segmentation is required in a detector to tolerate the high rate of positrons. The time resolution is required to be much better than the muon anomalous spin precession period while a buffer depth of a front-end electronics needs to be much longer than the accelerated muon lifetime. Requirements of this detector also meet requirements of a measurement of the muonium hyperfine structure interval at the J-PARC and another experiment to measure the proton charge radius at Tohoku University. We have developed a single-sided silicon strip sensor with a 190 μm pitch, a front-end electronics with a sampling rate of 200 MHz and a buffer memory depth of 8192, and a data acquisition system based on DAQ-Middleware for the J-PARC muon g− 2/EDM experiment. We have fabricated detector modules consisting of this sensor and the front-end electronics. Performance of fabricated detector modules was evaluated at a laboratory and a beam test using the positron beam at Tohoku University. The detector is confirmed to satisfy all requirements of the experiments except for the time walk, which will be solved by the next version of a front-end electronics.