Design optimization of a fast-neutron detector with scintillating fibers for triton burnup experiments at fusion experimental devices.

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ID: 97183
2019
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Abstract
Time-resolved triton burnup studies have been carried out to estimate the behavior of alpha particles in DD fusion experimental devices. In those studies, 14 MeV neutrons emitted through DT reactions in DD plasmas should be measured selectively in the backgrounds of DD neutrons and gamma rays. For this purpose, a scintillating-fiber (Sci-Fi) based fast-neutron detector has been adapted because of its advantages such as fast response, design flexibility in detection efficiency by changing the number of Sci-Fi, and discrimination property against 2.4 MeV neutrons produced through DD reactions and gamma rays. However, its length had conventionally been set to around 10 cm without an optimization study of its design parameters to meet the requirements as 14 MeV neutron detector. In the present study, we tested three types of Sci-Fi detectors with three different lengths and compared with the simulated results of energy deposition, through which we tried to understand the phenomena in the detection process of fast neutrons. From the results, it has been shown that, due to the self-shielding of neutrons by Sci-Fi and the attenuation of scintillation photons during the transmission process to the photomultiplier tube, the optimal length of Sci-Fi is concluded to be about 6 cm.
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takada2019designthe Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Takada, E;Amitani, T;Fujisaki, A;Ogawa, K;Nishitani, T;Isobe, M;Jo, J;Matsuyama, S;Miwa, M;Murata, I;
Journal The Review of scientific instruments
Year 2019
DOI
10.1063/1.5074131
URL
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