Abstract Details
Abstracts
Author: Ding Li
Requested Type: Pre-Selected Invited
Submitted: 2017-03-14 19:23:14
Co-authors: CDong, W. L. Zhang
Contact Info:
Institut of Physics, Chinese Academy of Sciences
8 South 3rd St., Zhongguancun
Beijing, 100190
China
Abstract Text:
The magnetic field will have a significant influence on many physical transport processes as the particles’ gyro-radii are smaller than the Debye length. For example, in high-field tokamak, the ratio of the thermal gyro-radius to Debye length for electron could be much smaller than one for the plasma.
The Fokker-Planck (F-P) equation in the presence of a magnetic field is derived. Within the binary collision model, the F-P coefficients are calculated explicitly. They can be used to study the effects of magnetic field on velocity slowing down, diffusion, and temperature relaxation. [1]
The high magnetic field may greatly affect the transport processes in the plasma. For example, the expressions for the exchange rates of the electron and ion parallel and perpendicular temperatures are derived analytically for small anisotropies in the presence of a magnetic field. It is shown that e-i collisions can significantly affect the relaxation of an anisotropic ion distribution in the high magnetic field. [2] It is shown that the e-e and i-i temperatures relaxation rates first increase and then decrease as the magnetic field grows, and the doubly logarithmic term contained in the e-i temperatures relaxation rate results from the exchange between the electron parallel and the ion perpendicular kinetic energies. [3]
[1] C. Dong, W. L. Zhang, and D. Li, Phys. Plasmas 23(8), 082105, 2016.
[2] Chao Dong, Haijun Ren, Huishan Cai, and Ding Li, Phys. Plasmas, 20 (3), 032512, 2013.
[3] Dong, Chao; Ren, Haijun; Cai, Huishan; and Li, Ding, Phys. Plasmas, 20 (10), 102518, 2013.
Comments:
Institute of Physics, Chinese Academy of Science(CAS), Beijing 100190, China
Univ. of CAS, Beijing, 100049, China
Univ. of Science & Technology of China, Hefei, 230026, China