Wave scattering processes in a plasma with ion temperature anisotropy

Abstract

The scattering of electromagnetic waves by density fluctuations in a magnetized plasma in the presence of an external pump field is investigated. The pump wave is supposed to decay into a lower-hybrid and an ion-cyclotron wave in a plasma with ion-temperature anisotropy.The cross-section obtained for the scattering of electromagnetic waves by turbulent fluctuations above threshold for the decay processes is found to be comparitively sensitive to the ion temperature anisotropy.

Double Langmuir frequency radiation due to transformation processes in turbulent plasma

“…where ω = ω UH , ω s for the upper hybrid and ion -sound waves respectively, χ 0 α (α = e, i) is the linear plasma susceptibility, and the expression for the nonlinear dielectric permittivity ε E (ω, k) is given in Wilhelmsson et al (1991) and Pavlenko et al (1986). We note that μ = k ⊥ E 0 c ω 0 B 0 1.…”

“…The theory of plasma fluctuations in magnetized plasma and the effect of finite amplitude oscillating electric field were discussed by Klimontovich (1982). In Pavlenko (1990), Wilhelmsson (1991) and Pavlenko (2002) on the base of kinetic fluctuations theory, the scattering in nonequilibrium plasma with hybrid pump is studied. Notice must be taken that the fluctuations theory for magnetized plasma with the pump was developed in Pavlenko (1986) and(1992).…”

Scattering of electromagnetic waves in a magnetized plasma with an HF pump

“…We study the parametric coupling of the lower-hybrid pump with the harmonics of the ion-cyclotron frequency (ω ≈ nΩ i ). The frequency and the damping rate of these oscillations at n = 1 are determined by (Wilhelmsson et al 1991b)…”

“…In Wilhelmsson et al (1991a), the scattering of electromagnetic waves by density fluctuations in a magnetized plasma was found to depend significantly upon the presence of parametric decay instabilities driven by a lower-hybrid pump wave. This offers interesting new approaches to plasma diagnostics.…”

“…Wave-scattering processes in a plasma with ion-temperature anisotropy were considered by Wilhelmsson et al (1991b). Note that the anisotropy of ion temperature plays an important role in the stability properties of the fusion plasmas.…”