Coaxial resonator for a megawatt 280 GHz gyrotron

  • J. J. Barroso
  • R. A. Correa
Article

Abstract

To provide the required mode selectivity for a megawatt 280 GHz gyrotron, a coaxial resonator operating in a high order TE mode is considered. Mode discrimination is achieved both by exploring the differences in the transverse structures of the competing modes and investigating a suitable geometry for the coaxial insert. For modes with close eigenfrequencies the associated diffractionQ factors can be widely different in value, thereby ensuring an effective mode selection. In the resonator studied here, the frequency separation between the design mode TE26,10,1 and its nearest competing mode TE20,12,1 is about 0.6% and the ratio of the correspondingQ factors is as high as 6.5. Unlike the coaxial resonator, in the hollow cavity without the inner conductor the fundamental spectrum of eigenfrequencies is more dense, and all TE modes within the frequency interval 271–288 GHz have approximately the sameQ factor.

Keywords

Mode Selection Design Mode Frequency Separation Mode Selectivity Transverse Structure 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    JORY, H., FELCH, K., HUSS, C., JONGEWAARD, E., NEILSON, J., PENDLETON, R., and TSIRULNIKOV, M. “Millimeter-wave, megawatt gyrotron development for ECR heating applications”.Proceedings of the International Workshop on Strong Microwaves in Plasmas. Suzdal, USSR, 18–23 Sept. 1990.Google Scholar
  2. 2.
    KREISCHER, K.E., DANLY, B.G., SCHUTKEKER, J.B., and TEMKIN, R.J. “The design of megawatt gyrotrons”.I.E.E.E. Transactions on Plasma Science,13, 364–373, 1985.Google Scholar
  3. 3.
    KREISCHER, K.E., GRIMM, T.L., MOBIOS, A.W., and TEMKIN, R.J. “The design of megawatt gyrotrons for the Compact Ignition Tokamak.”Thirteenth International Conference on Infrared and Millimeter Waves Digest, SPIE vol. 1039, 1988.Google Scholar
  4. 4.
    VLASOV, S.N., ZHISLIN, G.M., ORLOVA, I.M. PETELIN, M.I., and ROGACHEVA, G.G., “Irregular waveguides as open resonators”.Radiophysics and Quantum Electronics,12(8), 972–978, 1969.Google Scholar
  5. 5.
    TEMKIN, R.J. “Analytic theory of a tapered gyrotron resonator”.International Journal of Infrared and Millimeter Waves,2(4), 629–650, 1981.Google Scholar
  6. 6.
    VLASOV, S.N., ZAGRYDSKAYA, L.I., and ORLOVA, I.M. “Open coaxial resonators for gyrotrons”.Radio Engineering and Electronic Physics,21(5), 96–102, 1976.Google Scholar

Copyright information

© Plenum Publishing Corporation 1991

Authors and Affiliations

  • J. J. Barroso
    • 1
  • R. A. Correa
    • 1
  1. 1.Laboratório Associado de PlasmaInstituto Nacional de Pesquisas EspaciaisSão José dos CamposBrasil

Personalised recommendations