Plasma and Fusion Research
Online ISSN : 1880-6821
ISSN-L : 1880-6821
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Two-Dimensional Hα Emission Measurements Using the Multi-Channel Hα Array System in GAMMA 10/PDX
Tomoya YAMASAKIMasayuki YOSHIKAWAJunko KOHAGURAYoriko SHIMAHiroyuki NAKANISHIShun SUTOTomoya MOURIMizuki SAKAMOTOYousuke NAKASHIMA
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2020 Volume 15 Pages 1401035

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Abstract

We developed a multi-channel Hα array system to measure two-dimensional (2D) radial profiles of Hα emissivity in the central cell of the tandem mirror GAMMA 10/PDX. It consists of a 2D optical collection system, which contains twelve channels of lenses, Hα filters, and bundled optical fibers in vertical and horizontal directions. To study Hα emission behavior and its fluctuation in the hot-ion mode plasma experiments with additional plasma heating application, we used the modified Phillips-Tikhonov tomography method. After applying the fast Fourier transform analysis to the 2D Hα emissivity profiles, we could successfully obtain the 2D fluctuation images for the first time. These results are useful for the detailed study of fluctuations in magnetically confined plasma.

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© 2020 by The Japan Society of Plasma Science and Nuclear Fusion Research
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