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Choi, EunMi
THz Vacuum Electronics and Electrodynamics
Research Interests
  • High power millimeter-wave/THz wave, vacuum electronics, plasma breakdown, electron beams, electromagnetics, microwave/RF engineering

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Calculation of Radiation from a Helically Cut Waveguide for a Gyrotron Mode Converter in the Quasi-Optical Approximation

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Title
Calculation of Radiation from a Helically Cut Waveguide for a Gyrotron Mode Converter in the Quasi-Optical Approximation
Author
Choi, EunMiShapiro, M. A.Sirigiri, J. R.Temkin, R. J.
Issue Date
2009-01
Publisher
SPRINGER
Citation
JOURNAL OF INFRARED MILLIMETER AND TERAHERTZ WAVES, v.30, no.1, pp.8 - 25
Abstract
We present results of calculations of the radiation from a helically cut waveguide launcher, a so-called Vlasov launcher, which is commonly used either internal or external to a gyrotron for purposes of mode conversion. A gyrotron internal mode converter consists of such a launcher that radiates the waveguide mode as a nearly Gaussian beam in free space followed by a set of mirrors to focus and direct the radiation. The radiation from the launcher is first calculated using a geometric optics representation of the waveguide mode. Then the radiation is calculated in the quasi-optical limit, including diffraction. These analytic results are compared to a rigorous calculation using the computer code SURF3D, which uses an electric field integral equation (EFIE) approach. Good agreement is obtained between the quasi-optical theory and the SURF3D calculation. The present results provide new insights into the accuracy of the quasi-optical theory and may be useful for the design and improvement of Vlasov-type mode converters.
URI
https://scholarworks.unist.ac.kr/handle/201301/10876
URL
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=51749096135
DOI
10.1007/s10762-008-9418-x
ISSN
1866-6892
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