Development of neutron spectrometer toward deuterium plasma diagnostics in LHD

Journal Article · Fri Oct 15 00:00:00 EDT 2010 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.3464260· OSTI ID:22055757

Tomita, H; Iwai, H; Iguchi, T; Kawarabayashi, J ^[1]; Isobe, M ^[2]; Konno, C ^[3]

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1. Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603 (Japan)
2. National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292 (Japan)
3. Fusion Research and Development Directorate, Japan Atomic Energy Agency, Tokai-mura, Naka-gun, Ibaraki 319-1195 (Japan)

Neutron spectrometer based on coincident counting of associated particles has been developed for deuterium plasma diagnostics on Large Helical Device (LHD) at the National Institute for Fusion Science. Efficient detection of 2.5 MeV neutron with high energy resolution would be achievable by coincident detection of a scattered neutron and a recoiled proton associated with an elastic scattering of incident neutron in a plastic scintillator as a radiator. The calculated neutron spectra from deuterium plasma heated by neutral beam injection indicate that the energy resolution of better than 7% is required for the spectrometer to evaluate energetic deuterium confinement. By using a prototype of the proposed spectrometer, the energy resolution of 6.3% and the detection efficiency of 3.3x10{sup -7} count/neutron were experimentally demonstrated for 2.5 MeV monoenergetic neutron, respectively.

• OSTI ID: 22055757
• Journal Information: Review of Scientific Instruments, Vol. 81, Issue 10; Other Information: (c) 2010 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BEAM INJECTION
CONFINEMENT
DEUTERIUM
EFFICIENCY
ELASTIC SCATTERING
ENERGY RESOLUTION
LHD DEVICE
MEV RANGE
NEUTRON SPECTRA
NEUTRON SPECTROMETERS
PLASMA DIAGNOSTICS
PLASTIC SCINTILLATORS
PROTON RECOIL DETECTORS
RADIATORS