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Report No.

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

Parker, J. D.*; Harada, Masahide   ; Hiroi, Kosuke  ; Kai, Tetsuya   ; Matsumoto, Yoshihiro*; Oikawa, Kenichi   ; Segawa, Mariko   ; Shinohara, Takenao   ; Su, Y.  ; 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-$$mu$$s time resolution, high counting rates, and event-by-event background rejection. One such detector, the Micro Pixel Chamber-based Neutron Imaging Detector ($$mu$$ NID), provides a spatial resolution of 120 $$mu$$ m ($$sigma$$), time resolution of 0.6 $$mu$$s, 18% detection efficiency for thermal neutrons, and effective $$gamma$$ 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 $$mu$$ NID and show results of recent on-beam tests performed at RADEN.



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