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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, Lq, 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 Lq can be estimated by adding 501(31P)and 667(31D)nm singlet lines, which enables stand-alone parameter imaging considering the radiation trapping.

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