A Stability Condition of Plasma for Quasi-Interchange Modes in Externel Gravitational Potential

概要

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In the presence of an external grabitational potential, the necessary and sufficient condition for stability of interchanges in a cylindrical plasma with a constant pitch of the magnetic field is obtained. Both the equation of motion and the energy integral are used to derive the stability condition. Two limiting cases for interchanges, k・B→0 and k・B=0, are considered. The stability condition with k・B→0 deffers from the condition with k・B=0. For small k・B≠0 (quasi-interchanges), a dispersion relation is obtained to explain the differences. A calculation of the growth rates shows that the discontinuity results from the existence of two types of the quasi-interchanges, i. e., for k・B=0 one transformed into pure-interchanges and the other into pure-translations. Suydam's condition with a centrifugal potential and the constant-pitch field is suitable to the stability condition for quasi-interchanges.
社団法人日本物理学会の論文
1974-12-15