Influences of Charged Fusion Products on the Low-Frequency Gradient Instabilities in a Thermonuclear Plasma

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In spite of their small relative number, the high energy charged fusion products in a thermonuclear plasma, e.g., the α-particles form D-T reactions, can have certain influences on the dispersion characteristics of the plasma. In this paper, low-frequency gradient modes (drift waves) in a uniform magnetic field is considered in the electrostatic approximation taking the relative number Δ=n_α/n_e (≪1) and the relative gradient ρ=∇1n n_α/∇1n n_e (∣ρ∣∼1) as parameters, where n_α and n_e are the density of α-particles and electrons, respectively. It is found that in the normal case with ρ>0, the α-particles act to enhance/reduce the stability in the kinetic/hydrodynamic regime of density-gradient modes at small values of the perpendicular wavenumber; the contrary holds for the rather peculiar case of ρ<0. The α-particles have no significant direct effects on the temperature-gradient modes.
社団法人日本物理学会の論文
1975-07-15