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Momentum and heat friction forces between fast ions and thermal plasma species

J.P. Wang, M. Azumi, K. Tani, J.D. Callen1994年被引用 9Nuclear FusionIF 3出版社

Momentum and heat friction forces between fast ions (isotropic to the lowest order in the fast-ion rest frame) and thermal bulk plasma species (near Maxwellian) have been derived analytically for the first time using the linearized Fokker-Planck collision operator. The effects of flow-type distortions of the test particle distribution and flow-type restoring effects from field particles are both retained self-consistently. Here, the momentum and heat friction forces are defined as the momentum moments of the Fokker-Planck Coulomb collision operator weighted by the Laguerre polynomials L0(3/2)(wα/ν2Tα) and L1(3/2)(wα2/νTα2), respectively, i.e. the momentum friction force is F0α/β ≡ ∫ mαwαL0(3/2)Cα β[fα,fβ]d3wα , while the heat friction force is F1αβ ≡ ∫ mαwαL1(3/2)Cαβ[fα,fβ]d3wα. Here wα identical to ν - Vα represents the random velocity measured in the moving reference frame of the test particles, and the superscript α/β denotes test particles of species or colliding with field particles of species β. The momentum and heat friction forces have been explicitly calculated for electron-fast-ion collisions (Fke/f), fast-ion-electron collisions(Fkf/e), thermal-ion-fast-ion collisions (Fki/f) and fast-ion-thermal-ion collisions (Fkf/i), wherein the subscripts k correspond to the indices of Laguerre polynomials (k=0, 1). The collisional moment matrix is found to be asymmetric in the presence of fast ions-because the approximate self-adjointness of the Coulomb collision operator is not valid for this situation

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