Cutoff frequency of toroidal plasma waveguide

Journal Article · Sun Feb 15 04:00:00 EST 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4907795· OSTI ID:22408074

Zakeri-Khatir, H.; Aghamir, F. M. ^[1]

---

1. Department of Physics, University of Tehran, Tehran 14399 (Iran, Islamic Republic of)

The cutoff frequencies of E and H-modes of empty and plasma filled toroidal waveguides are evaluated. The effects of space curvature and plasma density on cutoff frequencies for both modes are investigated. Using a suitable variable change, a scalar wave equation in the direction of propagation was obtained. The study indicates that the curvature in the direction of wave propagation in toroidal waveguide has an analogous effect as a straight waveguide filled with anisotropic media. The Rayleigh-Schrodinger perturbation method was employed to solve for cutoff frequencies in the first order of approximation. In the limit of small space curvature, the toroidal waveguide cutoff frequencies for both E and H-modes approach those of TM and TE modes of empty cylindrical waveguide with a radius equal to toroidal waveguide minor radius. The analysis shows that the curvature in the direction of propagation in toroidal waveguides leads to the removal of the degeneracy between E and H-modes.

• OSTI ID: 22408074
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 2 Vol. 22; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ANISOTROPY
CYLINDRICAL CONFIGURATION
DISTURBANCES
H-MODE PLASMA CONFINEMENT
PLASMA DENSITY
TOROIDAL CONFIGURATION
WAVE EQUATIONS
WAVEGUIDES