Particle Aspect Analysis of Drift Instability
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概要
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A physical mechanism of drift instability is studied by investigating the trajectories of the particles. The method is the same as was used by Dawson in his theory of the Landau damping. The plasma particles are divided into two groups, the resonant and non-resonant particles. A drift wave is assumed to have started at t=0, when the resonant particles are undisturbed. The trajectories of the particles are then computed within the framework of the linear theory. Only those longitudinal waves which propagate obliquely to a static magnetic field in the plane normal to a density gradient are considered. The phase velocity along the magnetic field is assumed to be greater than the mean velocity of the ions, but smaller than that of the electrons. The resonant particles in this case are those electrons which have the velocities near to the phase velocity in the direction along the mean magnetic field. It is shown that the rate of energy change of the resonant electrons consists of two terms: one is the usual term arising from the Landau damping and the other the term due to the drift motion of the electrons in the crossed electric and magnetic fields. The latter term is responsible for instability of the wave. The major part of the wave energy is contained in the form of an oscillatory motion of the non-resonant electrons. Discussion of the stabilization by ion's Landau damping and of the drift instability due to impurity ions are given.
- 理論物理学刊行会の論文
- 1967-05-25
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