プラズマの乱流加熱の計算機実験と理論

概要

論文の詳細を見る
One dimensional sine waves E_0sin (kx-ωt+φ(t)) are used as a model of plasma turbulent fields. The behavior of electrons in these model fields is experimentally pursued by computer. The phase values φ(t) are given by discrete-time random variables uniformly distributed over [0,2π], i.e. φ(t)=φ_n a random value in each time interval nΔt<t<(n+1)Δt for n=0,1,……. Here, the interval Δt corresponds to the autocorrelation time of the turbulent fields. The velocity distributions of electrons, all of which start from ν=ν_0 initially, are sketched out approaching the Gaussian on the course of time. The mean and variance of electron velocities are obtained as a function of time, experimentaly and theoretically. Both results are mutually in good agreement. The existence of an optimum Δt for plasma heating by the presented fields is definitely shown. The variance after much time is proportional to E_0^2 for ω_B Δt<0.3,while to E_0 for ω_BΔt>2.0,where ω_B is the bounce frequency.
山梨大学の論文