Analytic model of electromagnetic ion-cyclotron anisotropy instability

作者：Yoon P H^*; Seough J J; Khim K K; Kim Hyunnam; Kwon Hyuck Jin; Park Jongsun; Parkh Sarah; Park Kyung Sun

来源：Physics of Plasmas, 2010, 17(8): 082111.

DOI：10.1063/1.3480101

In the present paper, the real frequency and growth rate associated with the electromagnetic ion cyclotron instability driven by temperature anisotropy are analytically modeled on the basis of conjecture and upon comparison with numerical roots of the dispersion relation. The ions are assumed to have an anisotropic distribution function with Maxwellian parallel distribution. Under such an assumption complex roots of the dispersion relation depend only on two dimensionless parameters, namely, the temperature anisotropy factor A = T(perpendicular to i)/T(parallel to i)-1, where T(perpendicular to i) and T(parallel to i) are the perpendicular and parallel ion temperatures, respectively, and the parallel ion beta, beta = (8 pi nT(parallel to i)/B(2))(1/2), where n and B are the plasma density and magnetic field intensity, respectively. The ion-cyclotron instability is thus heuristically modeled by complex frequency which is parametrically dependent on A and beta. The present result constitutes a useful shortcut research tool that may be employed in a wide variety of applications.

• 出版日期2010-8