Plasma compressibility induced toroidal Alfv{acute e}n eigenmode
- Department of Physics and Astronomy, University of California at Irvine, Irvine, California 92697-4575 (United States)
For circular tokamaks, it is demonstrated, both analytically and numerically, that there exists a new frequency gap within the shear Alfv{acute e}n continuous spectrum around the Alfv{acute e}n frequency, {omega}{sub A}=v{sub A}/qR, due to the ion compressibility effect. Here, v{sub A} denotes the Alfv{acute e}n speed, q is the safety factor, and R the major radius. The frequency gap width, meanwhile, is proportional to the core ion beta, {beta}{sub i} (ratio between core ion and magnetic pressures), and, correspondingly, the new discrete toroidal Alfv{acute e}n eigenmode (TAE) inside the gap is referred to as {beta}TAE. Collective excitations of the {beta}TAE by energetic ions are also analyzed. {copyright} {ital 1998 American Institute of Physics.}
- OSTI ID:
- 568302
- Journal Information:
- Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 2 Vol. 5; ISSN PHPAEN; ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
Similar Records
Kinetic toroidal Alfv{acute e}n eigenmodes in finite-{beta} tokamak plasmas
Observation of Toroidicity-Induced Alfv{acute e}n Eigenmodes in Ohmically Heated Plasmas by Drift Wave Excitation