Modification of Boundary Fluctuations by LHCD in the HT—7 Tokamak

作     者：SONGMei WANBao-Nian XUGuo-Sheng LINGBi-Li 

作者机构：InstituteofPlasmaPhysicsChineseAcademyofSciencesPOBox1126Hefei230031 

出 版 物：《Chinese Physics Letters》 (中国物理快报（英文版）)

年 卷 期：2003年第20卷第6期

页      面：865-868页

核心收录：

学科分类：08[工学] 082701[工学-核能科学与工程] 0827[工学-核科学与技术] 

基　　金：国家自然科学基金 

主　　题：Ohmic current drive HT-7 TOKAMAK boundary regions Particle Flux Turbulent Flow Non-Gaussian fluctuations SHEAR VELOCITY Tokamak devices Electron Flux MODIFICATION 

摘      要：Measurements of boundary fluctuations and fluctuation driven electron fluxes have been performed in ohmic and lower hybrid current drive enhanced confinement plasma using a graphite Langmuir probe array on HT-7 tokamak. The fluctuations are significantly suppressed and the turbulent fluxes are remarkably depressed in the enhanced plasma. We characterized the statistical properties of fluctuations and the particle flux and found a non-Gaussian character in the whole scrape-off layer with minimum deviations from Gaussian in the proximity of the velocity shear layer in ohmic plasma. In the enhanced plasma the deviations in the boundary region are all reduces obviously. The fluctuations and induced electron fluxes show sporadic bursts asymmetric in time and the asymmetry is remarkably weakened in the lower hybrid current driving (LHCD) phase. The results suggest a coupling between the statistical behaviour of fluctuations and the turbulent flow.