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Resonant particle instabilities in a uniform magnetic field

1967; Cambridge University Press; Volume: 1; Issue: 1 Linguagem: Inglês

10.1017/s002237780000310x

1469-7807

C. F. Kennel, H. Vernon Wong,

Magnetic confinement fusion research

We present here a simple expression for the resonant particle growth rate of arbitrary plasma waves propagating at an arbitrary angle to a uniform magnetic field in a spatially homogeneous plasma. We then are able to see that cyclotron harmonic wave-particle resonances contribute to instability when the resonant particle pitch angle distributions are anisotropic, while the phase velocity resonances of the Landau form are unstable to beam type phenomena. A sufficient condition for resonant particle stability is that particle distributions be isotropic and monotonically decreasing with increasing energy everywhere.