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Energy Distribution of Recycling Particles in Front of the Limiter and the Wall on the HT-7 Tokamak |
| XU Wei2;WAN Bao-Nian1;ZHOU Qian1;WU Zhen-Wei1;MAO Jian-Shan1;LI Jian-Gang1 |
| 1Institution of Plasma Physics, Chinese Academy of Sciences, PO Box 1126, Hefei 230031
2Department of Physics, Guangzhou University, Guangzhou 510405 |
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| Cite this article: |
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XU Wei, WAN Bao-Nian, ZHOU Qian et al 2003 Chin. Phys. Lett. 20 547-549 |
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Abstract The Hα(Dα) line shape in front of the limiter and the wall is measured by two sets of optical spectroscopy multi-channel analysers. The energy distribution is derived directly from the Hα(Dα) line shape, especially showing several molecular processes. The dissociative excitation of molecules is dominating when the local electron temperature is above 10 eV. The Dα line shape is also simulated by the Monte Carlo method, the result shows that the molecular dissociation contributes 57% neutral atoms, 53% emission intensity in front of the limiter, and 85\% neutral atoms, 82% emission intensity in front of the wall. The power loss from molecular dissociation is about 5.6 x 104kW/m-3 and the molecular dissociation is an important cooling mechanism at the plasma edge.
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| Keywords:
52.70.m
52.70.Kz
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Published: 01 April 2003
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52.70.m
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52.70.Kz
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(Optical (ultraviolet, visible, infrared) measurements)
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