文献类型：期刊文献

英文题名：Effects of the radial dependence of the fast electron diffusion coefficient on the current driven by lower-hybrid waves in tokamak

作者：Zhang, Xianmei[1];Wang, Yanhui[1];Yu, Limin[1];Shen, Xin[1];Wang, Jianbin[1]

机构：[1]E China Univ Sci & Technol, Dept Phys, Shanghai 200237, Peoples R China

年份：2012

卷号：19

期号：7

起止页码：914

外文期刊名：PHYSICS OF PLASMAS

收录：;EI(收录号：20124015530210);WOS:【SCI-EXPANDED(收录号:WOS:000307422800062)】；

基金：The author acknowledges the support of National ITER plans Program of China No. 2009GB105000.

语种：英文

外文关键词：Tokamak devices - Magnetoplasma

摘要：The lower hybrid current drive (LHCD) is one of the promising methods not only for driving the non-inductive current required for steady-state tokamak operation, but also for controlling the plasma current profile to improve confinement in tokamak experiments. A direct consequence of experimental imperfection is difficult to obtain reliable estimate of the radial diffusion coefficient (D-st) of the lower hybrid driven current. In this paper, the radial profile of D-st is estimated to investigate its effect on the current driven by lower hybrid wave (LHW) in Experimental Advanced Superconducting Tokamak. Compared with the case of the constant radial diffusion coefficient, the efficiency of LHW driven current with the radial dependent diffusion coefficient D-st (p) becomes either higher or lower with respect to the plasma parameters, such as the density and the magnetic fluctuation. It is also found that the profiles of the LHW driven current are different. Therefore, it is necessary to consider the radial dependence of D-st in order to get an accurate and reliable result in the numerical simulation of LHCD. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4739290]