文献类型：会议论文

英文题名：Study of the Absorption Coefficient of Alpha Particles to Lower Hybrid Waves in Tokamak

作者：Wang, Jianbing[1];Zhang, Xianmei[1];Yu, Limin[1];Zhao, Xiang[1]

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

会议论文集：20th Topical Conference on Radio Frequency Power in Plasmas

会议日期：JUN 25-28, 2013

会议地点：Sorrento, ITALY

语种：英文

外文关键词：alpha particles; lower hybrid waves; absorption coefficient

摘要：Part of the energy of the Lower Hybrid (LH) waves may be absorbed by the alpha particles via the so-called perpendicular landau damping mechanism, which depends on various parameters of fusion reactors and the LH waves. In this article, we calculate the absorption coefficient gamma(alpha) LH waves due to alpha particles. Results show that, the gamma(alpha) with the parallel refraction index n(parallel to) while deceases with increasing the frequency of omega(LH) waves over a wide range. Higher background plasma temperature and toroidal magnetic field will increase the absorption, and there is a peak value of gamma(alpha) when n(e) approximate to 8 x 10(19)m(-3) for TIER-like scenario. The thermal corrections to the cold plasma dispersion relation will change the damping rate to a certain extent under some specific conditions. We have also evaluated the fraction of LH power absorbed by the alpha particles, eta approximate to 0.47% and 4.1% for an LH frequency of 5 GHz and 3.7 GHz respectively for TIER-like scenario. This work gives the effective reference for the choice of parameters of future fusion reactors.