TY - JOUR
T1 - Design optimization of a fast-neutron detector with scintillating fibers for triton burnup experiments at fusion experimental devices
AU - Takada, E.
AU - Amitani, T.
AU - Fujisaki, A.
AU - Ogawa, K.
AU - Nishitani, T.
AU - Isobe, M.
AU - Jo, J.
AU - Matsuyama, S.
AU - Miwa, M.
AU - Murata, I.
N1 - Funding Information:
This research was supported by the National Institute for Fusion Science (NIFS) Collaboration Research program (Nos. NIFS17KLEH068 and NIFS15KOAH033) and the Japan-Korea Fusion Collaboration Program. The authors are also pleased to acknowledge for the assistance of the FNL team and OKTAVIAN team in neutron measurements.
PY - 2019/4/1
Y1 - 2019/4/1
N2 - 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.
AB - 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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U2 - 10.1063/1.5074131
DO - 10.1063/1.5074131
M3 - Article
C2 - 31043024
AN - SCOPUS:85064489340
VL - 90
JO - Review of Scientific Instruments
JF - Review of Scientific Instruments
SN - 0034-6748
IS - 4
M1 - 043503
ER -