Absorption of high-frequency guided waves in a plasma-loaded waveguide

Journal Article · Mon Oct 15 04:00:00 EDT 2007 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.2799161· OSTI ID:21057417

Ganguli, A; Akhtar, Kamran; Tarey, R D ^[1]

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1. Center for Energy Studies, Indian Institute of Technology, New Delhi 110 016 (India)

A kinetic theory model for the absorption of high-frequency guided plasma waves is presented for a warm, inhomogeneous, magnetized plasma column loaded inside a waveguide. Electron cyclotron resonance (ECR) absorption and Landau damping terms, derived as the anti-Hermitian part of the susceptibility tensor, are included in the model for a loss-free plasma-loaded waveguide developed earlier [A. Ganguli et al., Phys. Plasmas 5, 1178 (1998)]. In this formulation, the imaginary part of the complex propagation constant (in the presence of absorption) is obtained using a perturbation technique treating the anti-Hermitian part of the dielectric tensor as small in comparison to the Hermitian part, for the loss-free plasma. In this paper, we present the formulation for the inclusion of ECR absorption and Landau damping along with numerical results describing the role of a small population of warm electrons in wave damping in such a discharge. Numerical results are presented in the form of dispersion curves (plots of V{sub phase} versus {omega}/{omega}{sub e}) and damping curves (plots of |Im k{sub z}/k{sub v}| versus {omega}/{omega}{sub e}). It is seen that although the warm electrons have a marginal effect on wave dispersion, their presence produces a marked increase in the damping rates away from the ECR region. It is also shown that damping occurs primarily through Doppler-shifted ECR resonance and not Landau damping, even well away from ECR. Power absorption calculations are also presented for two magnetic field profiles.

• OSTI ID: 21057417
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 10 Vol. 14; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ABSORPTION
COMPARATIVE EVALUATIONS
DIAGRAMS
DIELECTRIC PROPERTIES
DIELECTRIC TENSOR
DISPERSIONS
DOPPLER EFFECT
ELECTROMAGNETIC RADIATION
ELECTRON CYCLOTRON-RESONANCE
ELECTRONS
HIGH-FREQUENCY DISCHARGES
LANDAU DAMPING
MAGNETIC FIELDS
PERTURBATION THEORY
PLASMA
PLASMA WAVES
RF SYSTEMS
WAVEGUIDES