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.
XU Wei;WAN Bao-Nian;ZHOU Qian;WU Zhen-Wei;MAO Jian-Shan;LI Jian-Gang. Energy Distribution of Recycling Particles in Front of the Limiter and the Wall on the HT-7 Tokamak[J]. 中国物理快报, 2003, 20(4): 547-549.
XU Wei, WAN Bao-Nian, ZHOU Qian, WU Zhen-Wei, MAO Jian-Shan, LI Jian-Gang. Energy Distribution of Recycling Particles in Front of the Limiter and the Wall on the HT-7 Tokamak. Chin. Phys. Lett., 2003, 20(4): 547-549.
2003, Vol. 20 
