Geodesic Acoustic Modes and Alfvén Continuum in Plasma Columns with Rotation
Plasma turbulence and MHD instabilities in the ohmic L-mode and bias H -mode regim...
| Full text | |
| Author(s): |
Elfimov, A. G.
[1]
Total Authors: 1
|
| Affiliation: | [1] Univ Sao Paulo, Inst Phys, BR-05508090 Sao Paulo - Brazil
Total Affiliations: 1
|
| Document type: | Journal article |
| Source: | Physics Letters A; v. 378, n. 47, p. 3533-3536, NOV 7 2014. |
| Web of Science Citations: | 5 |
| Abstract | |
Effect of a minor concentration of the energetic particles on GAM spectrum in a tokamak is analyzed by drift kinetic theory taking into the account the electron current and diamagnetic drift. A novel method of Jacobi functions is applied to solve the drift kinetic equation for the energetic bounce particles in the limit of high bounce frequency in comparison with the GAM frequency. Using the Q-asymptotic of Jacobi function, it is shown that the energetic minority ions can form the continuum minimum/maximum at the NB or ICR power deposition maximum where the geodesic eigenmode may be excited. In this case, the electron current modeled by shifted Maxwell distribution overcomes the ion Landau damping threshold thus resulting in the GAM instability. (C) 2014 Elsevier B.V. All rights reserved. (AU) | |
| FAPESP's process: | 11/50773-0 - Center of excellence in physics and applications of plasmas |
| Grantee: | Ricardo Magnus Osório Galvão |
| Support Opportunities: | Research Projects - Thematic Grants |