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Influence of Neutron Irradiation on the Large Helical Device Thomson Scattering System

Ichihiro YAMADA, Hisamichi FUNABA, Jong-ha LEE¹⁾, Yuan HUANG²⁾ and Chunhua LIU²⁾

National Institute for Fusion Science, Toki 509-5292, Japan

1)

National Fusion Research Institute, Daejeon 34133, Korea

2)

Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China

(Received 2 January 2020 / Accepted 19 August 2020 / Published 19 October 2020)

Abstract

Since 2017, deuterium plasma experiments (DD experiments) have been performed in large helical device (LHD), where neutrons with a specific energy of 2.45 MeV are generated through deuterium thermonuclear fusion reactions, and the influence on the devices located near the LHD are concerned. For the LHD Thomson scattering system, a view window, a light collection mirror, and optical fibers have been installed near the LHD. Degradation by neutron irradiation may cause serious problems in the results from the Thomson scattering diagnostic. We discuss the calibration of the three components and the neutron influences on the LHD Thomson scattering diagnostics.

Copyright (c) 2020 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

Thomson scattering diagnostic, large helical device, calibration

DOI: 10.1585/pfr.15.2402075

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