Combined Ideal and Kinetic Effects on Reversed Shear Alfven Eigenmodes

N.N. Gorelenkov, G.J. Kramer, and R. Nazikian

关键词: KINETIC EQUATIONS;    KINETICS;    MAGNETIC FIELDS;    PLASMA;    PLASMA DIAGNOSTICS;    REVERSED SHEAR;    SAFETY;    SHEAR Alfven Waves;    Kinetic Theory;    Tokamaks;    Magnetohydrodynamics (MHD);   

DOI  :  10.2172/1014579
RP-ID  :  PPPL-4626
PID  :  OSTI ID: 1014579
Others  :  TRN: US1102786

学科分类：原子、分子光学和等离子物理

美国|英语

来源: SciTech Connect

【 摘 要 】

A theory of Reversed Shear Alfven Eigenmodes (RSAEs) is developed for reversed magnetic field shear plasmas when the safety factor minimum, qmin, is at or above a rational value. The modes we study are known sometimes as either the bottom of the frequency sweep or the down sweeping RSAEs. We show that the ideal MHD theory is not compatible with the eigenmode solution in the reversed shear plasma with qmin above integer values. Corrected by special analytic FLR condition MHD dispersion of these modes nevertheless can be developed. Large radial scale part of the analytic RSAE solution can be obtained from ideal MHD and expressed in terms of the Legendre functions. The kinetic equation with FLR effects for the eigenmode is solved numerically and agrees with the analytic solutions. Properties of RSAEs and their potential implications for plasma diagnostics are discussed.