Finite Ion Temperature Effects on Three-Dimensional Kinetic Instabilities in Partially Magnetized Plasmas

In partially magnetized plasmas, in which the electrons are magnetized, and the ions are unmagnetized, it is known that the cross-field electron transport does not follow the classical transport theory due to collisional transport. Recent studies suggest that plasma waves driven by instabilities lead to the enhanced transport and diffusion across the magnetic fields. Examples of such kinetic instabilities are the electron cyclotron drift instability (ECDI) and modified two-stream instability (MTSI) due to the E<!--[if gte msEquation 12]>×B drift. In this talk, we extended the capabilities of the previously developed 3D generalized dispersion solver [1] to include the effects of finite ion temperature. The impact of ion and electron Landau damping [2] on the development of ECDI and MTSI is investigated. The finite ion temperature effects contribute to the damping of both modes, depending on the ion-to-electron temperature ratio, plasmas density, temperature, and field strengths. The numerical results of the 3D dispersion relation show that the shorter wavelength ECDI mode is more damped than the longer wavelength MTSI mode due to the warm ions. The resulting growth rates and phase velocities are obtained as a function of wavenumber for various plasma conditions and compared with experimental observations.