Particle Aspect Analyses of Electromagnetic and Electrostatic Instabilities due to Anisotropic Velocity Distributions
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概要
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Physical mechanisms of electromagnetic and electrostatic instabilities due to anisotropic velocity distributions are studied from the particle point of view. Two familiar examples are analysed in detail : the unstable cyclotron waves of electromagnetic mode which propagate along a static magnetic field and the unstable electrostatic waves of oblique propagation. The present analyses are based on a physical model similar to that used by Dawson in his theory of Landau damping. The plasma particles are divided into non-resonant particles and resonant ones. Resonant particles are supposed to have some limited value of the velocities along the magnetic field in order to see the Doppler-shifted frequency of a wave under consideration nearly equal to the gyration frequency or its harmonics. The particle trajectories are followed within the framework of lmear theory under the initial condition such that the main plasma composed of non-resonant particles has the wave on it while resonant particles are undisturbed. The rate of energy change of resonant particles is thus computed, from which instability criterion can be derived. It is shown that in both processes the physical mechanisms of instability are quite similar. When the mean transverse energy of resonant particles exceeds sufficiently the mean parallel one, they spend more time in losing energy than in gaining energy. In particular on electrostatic instability three typical cases are considered in which physical pictures are different from each other. The first is the system of hot electrons and hot ions in which we shall see
- 理論物理学刊行会の論文
- 1967-04-25
著者
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Terashima Yoshinosuke
Institute Of Plasma Physics Nagoya University
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Terashima Yoshinosuke
Institute Of Plasma Physics Nagoya Univ.
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