摘要
The dispersion relation and damping rate of kinetic Alfvén waves(KAWs) in a deuterium-tritium fusion plasma with slowing-down distributed α-particles are investigated using the kinetic theory. The variations of wave frequency and damping rate with respect to the α concentration(n_(α)/n_(e)) and perpendicular wave number(k_(⊥)) are studied from a numerical way. The results show that the fluctuation of α concentration slightly affects the frequency and damping rate of KAWs at low n_(α)/n_(e). In addition, the frequency and the damping rate increase as the k_(⊥) and the background temperature Te increase. For comparison, the calculations are performed also in the case of α-particles following an equivalent Maxwellian distribution. For a given k_(⊥), the value of the frequency obtained in the slowing-down distribution case is smaller than that obtained in the Maxwellian distribution case. Conversely, the value of the damping rate obtained in the slowing-down distribution case is slightly larger than that obtained in the Maxwellian distribution case.
作者
Fei-Fei Lu
San-Qiu Liu
路飞飞;刘三秋(Jiangxi Province Key Laboratory of Fusion and Information Control,Department of Physics,Nanchang University,Nanchang 330031,China;School of Materials Science and Engineering,Nanchang University,Nanchang 330031,China;NCU-ASIPP Magnetic Confinement Fusion Joint Laboratory,Institute of Fusion Energy and Plasma Application,Nanchang University,Nanchang 330031,China)
基金
Project supported by the National Natural Science Foundation of China (Grant Nos. 11863004 and 11763006)
the Jiangxi Provincial Key Laboratory of Fusion and Information Control, China (Grant No. 20171BCD40005)
the Project of Scientific and Technological Innovation Base of Jiangxi Province, China (Grant No. 20203CCD46008)。
