[Table of Contents]

Plasma and Fusion Research

Volume 10, 1402090 (2015)

Regular Articles

Effects of Neutrons and γ-Rays on Scintillation Light in SX Diagnostics for LHD Deuterium Plasma Experiments
Takahiro BANDO1), Satoshi OHDACHI1,2) and Yasuhiro SUZUKI1,2)
1)
SOKENDAI (The Graduate University for Advanced Studies), 322-6 Oroshi-cho, Toki 509-5292, Japan
2)
National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
(Received 30 June 2015 / Accepted 15 October 2015 / Published 28 December 2015)

Abstract

In the Large Helical Device (LHD) semiconductor-based detector arrays for soft X-ray (SX) emission have been used for studying MHD instabilities. However, a semiconductor device is expected to be damaged in high neutron flux environments in the coming LHD deuterium plasma experiments. In order to measure an SX in such environments, a CsI:Tl scintillator-based diagnostic is being developed. Though CsI:Tl is sensitive to a neutron and to a gamma-ray, as well, effects on scintillation light can be reduced if very thin CsI:Tl foil (50 micrometers) is used. An SX is converted to visible light by a scintillator and led to optical fibers. The light is transferred away from LHD and detected by a semiconductor detector array set in a neutron and gamma-ray shielding box. Effects by neutrons and gamma-rays on scintillation light are quantitatively estimated based on the deuterium plasma experiment condition of LHD.

Keywords

CsI:Tl, soft X-ray, diagnostic, LHD, deuterium plasma, neutron, gamma-ray

DOI: 10.1585/pfr.10.1402090

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This paper may be cited as follows:

Takahiro BANDO, Satoshi OHDACHI and Yasuhiro SUZUKI, Plasma Fusion Res. 10, 1402090 (2015).