Computation for dispersion of gyro-TWT with a helical waveguide by MAFIA

zhou lin; chen huai-bi; xu zhou; zheng shu-xin; he xiao-zhong

Volume 17 Issue 07

Jul. 2005

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Article Navigation > High Power Laser and Particle Beams > 2005 > 17(07): 0-

wang jia-yin, shi jia-ming, yuan zhong-cai, et al. Plasma diagnostic method using the transmission attenuation of microwaves at three frequencies[J]. High Power Laser and Particle Beams, 2007, 19.

Citation:

zhou lin, chen huai-bi, xu zhou, et al. Computation for dispersion of gyro-TWT with a helical waveguide by MAFIA[J]. High Power Laser and Particle Beams, 2005, 17.

wang jia-yin, shi jia-ming, yuan zhong-cai, et al. Plasma diagnostic method using the transmission attenuation of microwaves at three frequencies[J]. High Power Laser and Particle Beams, 2007, 19.

Citation:

zhou lin, chen huai-bi, xu zhou, et al. Computation for dispersion of gyro-TWT with a helical waveguide by MAFIA[J]. High Power Laser and Particle Beams, 2005, 17.

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Computation for dispersion of gyro-TWT with a helical waveguide by MAFIA

1.
Department of Engineering Physics,Tsinghua University,Beijing 100084,China;
2.
Institute of Applied Electronics,CAEP,P.O.Box 919-1014,Mianyang 621900,China

Publish Date: 2005-07-15

Abstract

Abstract

This paper provides a simple technique to design and optimize the spiral waveguide of Gyro-TWT. The dispersion characteristics of helical waveguide was given out. The structure of waveguide was modeled by CAD and it′s dispersion curve was calculated by MAFIA using quasi-periodic boundary condition. The modes were calculated alternation 30° phaseshift from -180° to 180°. This method leads to a good agreement with the result of dispersion equation over 8.3~10.6 GHz, and the maximum relative deviation is below 0.5%. For a rather broad frequency band around the point where the longitudinal wavenumber is equal to zero, the slope of the dispersion curve trends to a positive constant. As a micro-wave amplifier, Gyro-TWT using spiral waveguide has a good potential in improving its effectivenes
- dispersion characteristics,
- mafia,
- gyro-twt,
- helical waveguide,
- model coupling

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