Development of the next-generation micro pixel chamber-based neutron imaging detector ( NID) for energy-resolved neutron imaging with high rate and high spatial resolution at the J-PARC/MLF

J-PARC/MLFにおける次世代マイクロピクセルチェンバーを用いた中性子イメージング検出器の開発

Parker, J. D.*; 原田 正英   ; 廣井 孝介  ; 甲斐 哲也   ; 松本 吉弘*; 及川 健一   ; 瀬川 麻里子   ; 篠原 武尚   ; Su, Y. H.  ; 高田 淳史*; Zhang, S.*; 谷森 達*; 鬼柳 善明*

Parker, J. D.*; Harada, Masahide; Hiroi, Kosuke; Kai, Tetsuya; Matsumoto, Yoshihiro*; Oikawa, Kenichi; Segawa, Mariko; Shinohara, Takenao; Su, Y. H.; Takada, Atsushi*; Zhang, S.*; Tanimori, Toru*; Kiyanagi, Yoshiaki*

To carry out energy-resolved neutron imaging at RADEN, we use cutting-edge detector systems employing micro pattern detectors and data acquisition systems based on Field Programmable Gate Arrays to provide the necessary sub-s time resolution, high counting rates, and event-by-event background rejection. One such detector, the Micro Pixel Chamber-based Neutron Imaging Detector ( NID), provides a spatial resolution of 120 m (), time resolution of 0.6 s, 18% detection efficiency for thermal neutrons, and effective sensitivity of less than 10-12. We have recently increased the rate capacity from 600 kips to more than 4 MPs via an upgrade of the front-end electronics and tested a new gas mixture optimized for better spatial resolution and higher detection efficiency. In this presentation, we will discuss the ongoing development of the NID and show results of recent on-beam tests performed at RADEN.