The properties of the frequency splitting of the axisymmetric magnetoacoustic wave and an application to current profile diagnosis
In the presence of finite plasma current, the axisymmetric (m = 0) magnetoacoustic wave resonance exhibits a frequency splitting for finite toroidal mode number (with non-zero n) between oppositely directed travelling waves. Calculations are presented which demonstrate that the difference between the inverse resonance frequencies is closely proportional to known moments of the plasma current profile and, in the limit where the radial wave number is much larger than the parallel wave number, is independent of the plasma mass density and its profile. A discussion of the observability of the splitting for the purpose of current profile diagnosis, given the theoretical and experimental data available, is also presented.
Bibliographic Reference: Article: Physics of Fluids B, Vol. 3 (1991) No. 5, pp. 1191-1197
Record Number: 199111084 / Last updated on: 1994-12-02
Original language: en
Available languages: en