Plasma Effect on the Fast- and Mixed-Wave Modes of Gyrotron Devices
The linear theory of a plasma-loaded gyrotron amplifier is studied within the quick- and mixed-wave modes. The dispersion relation comes using the Vlasov-Maxwell equations. The effects of beam location, plasma column radius, electron beam parameters, and azimuthal harmonic range on the expansion rate for the quick- and mixed-wave modes are investigated. In addition, the radial behavior of the electric field is studied. The results show that the expansion rate and bandwidth of the mixed-wave mode are larger than those of the quick-wave mode. It's shown that the bandwidth of this structure is largest for a small value of the axial momentum unfold. Moreover, it is indicated that for a lower harmonic number, the axial electrical field has its most price at the middle of the plasma.
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