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To, Kentaro; Nakamura, Tatsuya; Sakasai, Kaoru; Soyama, Kazuhiko; Yamagishi, Hideshi*
Journal of Instrumentation (Internet), 7(1), p.C01025_1 - C01025_6, 2012/01
Times Cited Count：1 Percentile：7.11(Instruments & Instrumentation)We are currently developing a two-dimensional neutron detection system that can read out individual signals and consists of a micro-pixel detector element. By increasing the gas pressure, the spatial resolution and detection efficiency of a two-dimensional gas-based detector are improved but the output signal strength is decreased. Therefore, the supply voltage must be increased to obtain output signals under high pressure. In the present study, we have developed a micro-pixel detector element with a high-voltage resistance by an improved fabrication process. The voltage resistance of the element was improved, and the element could operate up to 750 V at a total pressure of 5 atm (4.1 atm of He and 0.9 atm of CF
). The measured gas gain was found to be approximately 100, and the thermal neutron detection efficiency was estimated to be 70%. A flat-field image showed good homogeneity, and the average gain spread was about 8.7%.
Yamagishi, Hideshi*; To, Kentaro; Nakamura, Tatsuya; Sakasai, Kaoru; Soyama, Kazuhiko
Journal of Instrumentation (Internet), 6(12), p.C12025_1 - C12025_7, 2011/12
Times Cited Count：3 Percentile：18.19(Instruments & Instrumentation)We are currently developing a multiwire-type two-dimensional neutron detector system for use at the Materials and Life Science Experimental Facility at J-PARC. This system can attain high response time and high spatial resolution by using the individual line readout method. The performance parameters of a gas-based two-dimensional neutron detector, such as spatial resolution and detection efficiency, strongly depend on the mixture gas condition. We developed a simulation program for our multiwire-type two-dimensional neutron detector system to determine the gas condition. Further, a small test system was fabricated to evaluate the simulation program. Experimental results obtained using the small test system agreed well with the simulation results, thus, it was confirmed that the simulation program can be effectively used to determine the gas condition when the required spatial resolution and detection efficiency are known.
