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

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 t...

Full description

Saved in:
Bibliographic Details
Published in:Review of scientific instruments 2019-04, Vol.90 (4), p.043503-043503
Main Authors: Takada, E., Amitani, T., Fujisaki, A., Ogawa, K., Nishitani, T., Isobe, M., Jo, J., Matsuyama, S., Miwa, M., Murata, I.
Format: Article
Language:English
Subjects:
Alpha particles
Alpha rays
Attenuation
Design optimization
Design parameters
Fast neutrons
Gamma rays
Neutron counters
Neutrons
Photomultiplier tubes
Photons
Plasmas (physics)
Scientific apparatus & instruments
Scintillating fibers
Sensors
Shielding
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.5074131