Plasma Effect on the Fast- and Mixed-Wave Modes of Gyrotron Devices

The linear theory of a plasma-loaded gyrotron amplifier is studied in the fast- and mixed-wave modes. The dispersion relation is derived using the Vlasov-Maxwell equations. The effects of beam location, plasma column radius, electron beam parameters, and azimuthal harmonic number on the growth rate for the fast- and mixed-wave modes are investigated. In addition, the radial behavior of the electric field is studied. The results show that the growth rate and bandwidth of the mixed-wave mode are larger than those of the fast-wave mode. It is shown that the bandwidth of this structure is largest for a small value of the axial momentum spread. Moreover, it is indicated that for a lower harmonic number, the axial electric field has its maximum value at the center of the plasma.

[1]  Manfred Thumm,et al.  The Gyrotron at 50: Historical Overview , 2014 .

[2]  K. Reddy,et al.  Review on microwave generation using backward wave oscillator , 2014 .

[3]  刘濮鲲,et al.  Analysis of the axial electric field in a plasma-loaded-helix travelling wave tube , 2006 .

[4]  Gregory S. Nusinovich,et al.  Introduction to the Physics of Gyrotrons , 2004 .

[5]  Manfred Thumm,et al.  Gyrotrons: High-Power Microwave and Millimeter Wave Technology , 2003 .

[6]  T. Antonsen,et al.  Linear theory of a plasma-loaded, helix type, slow wave amplifier , 1998, 25th Anniversary, IEEE Conference Record - Abstracts. 1998 IEEE International Conference on Plasma Science (Cat. No.98CH36221).

[7]  T. Antonsen,et al.  Electromagnetic properties of corrugated and smooth waveguides filled with radially inhomogeneous plasma , 1996, IEEE Conference Record - Abstracts. 1996 IEEE International Conference on Plasma Science.

[8]  Weaver,et al.  Plasma influence on the dispersion properties of finite-length, corrugated waveguides. , 1996, Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics.

[9]  V. Granatstein,et al.  High-power microwave generation by excitation of a plasma-filled rippled boundary resonator , 1990 .

[10]  V. K. Jain,et al.  Effect of plasma and dielectric loading on the slow-wave properties of a traveling-wave tube , 1990 .

[11]  V. A. Flyagin,et al.  Gyrotron oscillators , 1988, Proc. IEEE.

[12]  H. Uhm,et al.  Theory of gyrotron amplifier in a waveguide with inner dielectric material , 1981 .

[13]  H. Uhm,et al.  Broad-Band Operation in a Dielectric Loaded Gyrotron , 1981, IEEE Transactions on Nuclear Science.

[14]  H. Uhm,et al.  Mixed slow‐wave operation of a wide‐band dielectric gyrotron , 1981 .

[15]  H. Uhm,et al.  Analysis of the wide band gyrotron amplifier in a dielectric loaded waveguide , 1981 .