Propagation of electrostatic ion cyclotron waves in two-ion species plasma and its application

It is known that there exist two modes of propagation of electrostatic ion cyclotron waves : One is the neutral mode which propagates obliquely to the agnetic field, and the other is the pure mode which propagates perpendicularly to the magnetic field. In this paper, the keinetic dispersion equation in the neon cyclotron region was numerically solved. Helium and neou were chosen as the light and heavy ions, respectively. A homogeneous non-colliding plasma with Maxwellian velocity distribution was assumed. The mixing ratio of helium ions (α) and the propagation angle (theta) were chosen as main parameters. The primary objective of this study was to see the effects of the variations of α and theta(>= 600) on the dispersion relation of the modified neutral mode (the neutral mode affected by the pure mode). Excitation coefficients were also calculated and the feasibility of plasma heating with the modified neutral mode was investigated. (Aoki, K.)