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Application of He I Line Intensity Ratio Method to Lyot-Filter-Based Imaging Spectrometry on MAP-II Divertor Simulator

Shinichiro KADO

Institute of Advanced Energy, Kyoto University, Uji 611-0011, Japan

(Received 3 October 2018 / Accepted 2 July 2019 / Published 25 September 2019)

Abstract

A simple, yet advanced technique of imaging spectrometry of divertor-relevant low-temperature plasmas using a wavelength-tunable Lyot filter spectral camera is herein proposed. The influence of the radiation-trapping effect in the atomic helium line intensity ratio method, characterized by the trapping radius, L_q, can be reduced using only the triplet series: 471(4³S)-, 587(3³D)-, and 706(3³S)-nm lines that are included in the tunable range of the above-mentioned Lyot filter. Approximate values of L_q can be estimated by adding 501(3¹P)- and 667(3¹D)-nm singlet lines, which enables stand-alone parameter imaging considering the radiation trapping.

Copyright (c) 2019 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

Lyot filter, imaging spectroscopy, line intensity ratio, atomic helium line, leak band, collisional-radiative model, radiation trapping

DOI: 10.1585/pfr.14.2402140

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