中国物理B ›› 2004, Vol. 13 ›› Issue (9): 1510-1515.doi: 10.1088/1009-1963/13/9/025
万宝年1, 周倩1, 吴振伟1, 毛剑珊1, 李建刚1, 徐伟2
Xu Wei (徐伟)ab, Wan Bao-Nian (万宝年)a, Zhou Qian (周倩)a, Wu Zhen-Wei (吴振伟)a, Mao Jiao-Shan (毛剑珊)a, Li Jian-Gang (李建刚)a
摘要: The cross-field diffusion coefficient (D_⊥) at the edge in the HT-7 tokamak is close to the Bohm value when the line average electron density ranges from 1.5×10^{19} to 3.0×10^{19}m^{-3}. The energy profile of the particles is derived directly from the H_α(D_α) line shape; the dissociative excitation of molecules is dominating when the local electron temperature is above 10eV. By means of the Monte Carlo method the D_α line shape is also simulated. We find that the molecular dissociation contributes to 57% of neutral atoms and 53% of emission intensity in front of the limiter, and 85% of neutral atoms and 82% of emission intensity in front of the wall. The influence of atomic and molecular processes on the energy balance is discussed for the scrape-off layer (SOL), and the power loss from molecular dissociation is found to be 6×10^4kW at the SOL. The ion Bernstein wave (IBW) can effectively suppress the magnetohydrodynamic behaviour, the fluctuation levels and the turbulence; the D_⊥ in front of the limiter declines from 0.84 to 0.2m^2·s^{-1} and the particle confinement time rises from 9 to 12ms.
中图分类号: (Tokamaks, spherical tokamaks)