Excitation and Stabilization of Microinstabilities by R.F. Electric Field

概要

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Effects of a weak rf electric field parallel to the magnetic field on microinstabilities driven by non-Maxwellian distribution of ion or anisotropic one are investigated theoretically and experimentally. Concerning non-Maxwell instability, excitation and stabilization of the instability are observed in a certain frequency region of the rf field: ω_<ci>≲ω_0≲2ω_<ci>, where ω_0 and ω_<ci> are the frequency of the rf field and the ion cyclotron frequency respectively. The calculation indicates that the stabilization is due to the induced electron drifts and that the excitation is caused by the mode-mode couplings. Anisotropic instability is studied only theoretically under the rf field: ω_0≈ω_<ci>. This instability can by smoothly stabilized through Landau damping due to the electrons heated along the megnetic field by the rf field.
社団法人日本物理学会の論文
1972-03-05