Speaker
Haifeng Liu
(Institute of Fusion Science)
Description
The heating of ions by an obliquely propagating shear Alfvén wave at frequencies a fraction of the particle cyclotron frequency is demonstrated analytically. Under consideration of the small wave amplitude, the resonance conditions in the laboratory frame are systematically derived by multi-scale expansion method. It is found that 1) the cyclotron resonance condition may occur at any wave frequencies. 2) the high-order cyclotron resonance conditions are satisfied, which yield higher order cyclotron resonance. In other words, the low order cyclotron resonance heating efficiency is greater than the high. 3) a navel generation mechanism on stochastic motions of ions, put forward, is that hybrid-order ion cyclotron resonance caused by a single Alfvén wave can randomize the ion motion. This phenomenon may have relevance for the heating of ions in some toroidal confinement fusion devices as well as for ion heating in the solar corona.
Co-authors
Changjian Tang
(Physics Department, Sichuan university, Chengdu, China;Institute of Fusion Science, School of Physical Science and Technology,Southwest Jiaotong University, Chengdu, China)
Haifeng Liu
(Institute of Fusion Science, School of Physical Science and Technology,Southwest Jiaotong University, Chengdu, China;Physics Department, Sichuan university, Chengdu, China)
