ISSN:
1089-7666
Source:
AIP Digital Archive
Topics:
Physics
Notes:
The anomalous Doppler instability is investigated for two-dimensional velocity distributions f(v(parallel),v⊥) appropriate for lower-hybrid current drive. In this case, in contrast to the runaway electron problem, this mode becomes unstable at high density when the ratio ω2pe/ ω2ce is sufficiently large. Increasing the maximum velocity v2 of the rf (radio-frequency) plateau, v1≤v(parallel) ≤v2, is also a destabilizing influence. In this paper expressions are given for the growth rate of the electrostatic waves obeying the dispersion relation ω=ωpe (1+ω2pe/ ω2ce)−1/2 k(parallel)/k, employing both analytic expressions for f(v(parallel),v⊥) and numerical solutions for f from the two-dimensional Fokker–Planck equation. The analytical and numerical results are in close agreement.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.866146
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