Two-Dimensional Hα Emission Measurements Using the Multi-Channel Hα Array System in GAMMA 10/PDX
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- YAMASAKI Tomoya
- Plasma Research Center, University of Tsukuba
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- YOSHIKAWA Masayuki
- Plasma Research Center, University of Tsukuba
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- KOHAGURA Junko
- Plasma Research Center, University of Tsukuba
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- SHIMA Yoriko
- Plasma Research Center, University of Tsukuba
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- NAKANISHI Hiroyuki
- Plasma Research Center, University of Tsukuba
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- SUTO Shun
- Plasma Research Center, University of Tsukuba
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- MOURI Tomoya
- Plasma Research Center, University of Tsukuba
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- SAKAMOTO Mizuki
- Plasma Research Center, University of Tsukuba
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- NAKASHIMA Yousuke
- Plasma Research Center, University of Tsukuba
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Abstract
<p>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.</p>
Journal
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- Plasma and Fusion Research
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Plasma and Fusion Research 15 (0), 1401035-1401035, 2020-06-08
The Japan Society of Plasma Science and Nuclear Fusion Research