Abstract
The gyrotron amplifiers in two slow wave structures, disc and helix-loaded waveguides, are investigated for wideband applications, For each structure, properties of the vacuum waveguide mode are examined in connection with the gyrotron application, and the gyrotron dispersion relation is obtained. For the disc-loaded waveguide, it is found that the group velocity of the waveguide mode can be easily varied by the disc parameters, and the gain and the bandwidth are at least comparable to those of the ordinary gyrotron. In the helix-loaded waveguide configuration, the gyrotron can be very broad in its bandwidth. Moreover, the hybrid mode operation, using the helix mode as a carrier, shows possibility of fast wave wideband amplification by contouring the waveguide.
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