Analysis of D$\alpha$H$\alpha$ spectrum emitted in front of the limiter in HT--7
Huang Juan (黄娟)a, Wan Bao-Nian (万宝年)a, Daren Stotlerb, Xiao Bing-Jia(肖炳甲)a, Wu Zhen-Wei (吴振伟)a, the HT--7 teama
a Institute of Plasma Physics, Chinese Academy of Sciences, P.O. Box 1126, Hefei 230031, China; b Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543, USA
Abstract In order to understand the recycling and emission processes of hydrogen atoms in HT--7, spectral profiles of the D$\alpha$H$\alpha$ line emitted in front of the limiter have been observed with a high-resolution spectrometer and simulated by using the neutral particle transport code DEGAS 2. The results show that four processes are necessary to interpret the D$\alpha$H$\alpha$ line shape: 1) atom desorption, 2) molecular dissociation, 3) particle reflection, and 4) charge-exchange. The products of the first two processes are cold atoms which emit photons near the peak of D$\alpha$H$\alpha$ line shape, and those from the last two are warm atoms contributing to the blue side of the spectrum. For a typical ohmic discharge (shot 68520 ne (0)≈3x1019m-3, these components contribute 32%, 15%, 32% and 21%, respectively. D$\alpha$H$\alpha$ line shapes under different plasma parameters are also discussed in this paper.
Received: 27 May 2008
Revised: 25 June 2008
Accepted manuscript online:
Fund: Project supported by the National
Natural Science Foundation of China (Grant No
10725523).
Cite this article:
Huang Juan (黄娟), Wan Bao-Nian (万宝年), Daren Stotlerb, Xiao Bing-Jia(肖炳甲)a, Wu Zhen-Wei (吴振伟), the HT-- team Analysis of D$\alpha$H$\alpha$ spectrum emitted in front of the limiter in HT--7 2008 Chin. Phys. B 17 4562
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