High space harmonic perturbations in travelling wave tubes

  • Han S. Uhm
  • Joon Y. Choe
  • Chung M. Kim
Article

Abstract

Stability properties of the free streaming mode in an electron beam propagating through a cylindrical waveguide loaded with a tape helix are investigated, including influence of high space harmonic perturbations. Closed algebraic dispersion relation of the free streaming mode are obtained. Properties of the high space harmonic perturbations are numerically investigated in connection with application on a high frequency microwave amplifier. One of the most important features in this analysis is that instability of high harmonic perturbations occurs at a very large value of microwave frequency. In this regard, millimeter microwave can be easily attainable by reducing the helix radius to a subcentimeter.

Keywords

Microwave Electron Beam Dispersion Relation Stability Property Free Stream 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. [1]
    J. L. Hirschfield and V. L. Granatstein, IEEE Trans. Microwave Theory Tech. MTT-25, 528 (1977).Google Scholar
  2. [2]
    J. Y. Choe, H. S. Uhm, and S. Ahn, J. Appl. Phys.52, 7067 (1981) and the references therein.Google Scholar
  3. [3]
    A. Palevsky and G. Beketi, Phys. Fluids,22, 986 (1979).Google Scholar
  4. [4]
    D. A. G. Deacon, L. R. Elias, J. M. M. Madey, G. L. Pamian, H. A. Shwettman, and T. I. Smith, Phys. Rev. Lett.38, 897 (1977).Google Scholar
  5. [5]
    H. S. Uhm and R. C. Davidson, Phys. Fluids24, 2348 (1981) and the references therein.Google Scholar
  6. [6]
    J. R. Pierce,Travelling-Wave Tubes (D. Van Nostrand Co., Inc., N. Y., 1950) and the references therein.Google Scholar
  7. [7]
    P. J. Tallerico and J. E. Rowe, IEEE Trans. on Electron Devices,ED-17, 549 (1970).Google Scholar
  8. [8]
    H. G. Kosmahl, IEEE Trans. on Electron Devices,ED-27, 526 (1980).Google Scholar
  9. [9]
    D. A. Watkins, Topics inElectromagnetic Theory (John Wiley, N.Y., 1958) Chap 2.Google Scholar
  10. [10]
    H. S. Uhm, Phys. Fluids26, in press (1983).Google Scholar
  11. [11]
    H. S. Uhm and J. Y. Choe, “Electromagnetic Wave Propagation in a Tape Helix Waveguide,” submitted for publication.Google Scholar

Copyright information

© Plenum Publishing Corporation 1983

Authors and Affiliations

  • Han S. Uhm
    • 1
  • Joon Y. Choe
    • 1
  • Chung M. Kim
    • 1
  1. 1.Naval Surface Weapons CenterSilver Spring

Personalised recommendations