Numerical Analysis on Linear Resonant Absorption in Plasmas

抄録

Theoretical analyses on the linear resonant absorption of electromagnetic waves in inhomogeneous plasmas given by various authors are re-examined by numerical computation. A set of linearized equations in which collisional and thermal effects of the electrons are included is solved numerically for a wide range of plasma parameters by developing an implicit difference scheme with extremely small numerical errors. We are successful to decrease electron temperatures as low as 200 K. It is concluded that the Denisov’s factor (v_t⁄\sqrt2ωL)^2⁄3 with a numerical correction can be used to calculate the peak electrostatic fields at the resonant surface, if his factor is larger than 20 times the collisional factor ν⁄ω. Here, L is the characteristic length of the density gradient and other notations are standard. An empirical formula to calculate the peak field in the presence of both collisional and thermal effects is proposed.