Schematic representation of axial profiles of the magnetic field (top), waveguide wall, and electron beam in the gyrotron after cavity region.
Dispersion diagrams illustrating the cyclotron resonance interaction in the cavity (solid lines) and after cavity (dashed lines).
The coupling coefficient for the -mode as the function of the ratio of the electron guiding center radius to the cavity wall radius.
The axial dependence of the cyclotron resonance detuning in the aftercavity region. (a) and (b) correspond to different values of the magnetic field tapering parameter, (a) and (b).
Axial dependence of the shift in the ratio of the electron guiding center radius to the wall radius for two values of the magnetic field tapering parameter, (a) and (b).
The dependence of the optimal wall tapering parameter discriminating the aftercavity interaction (solid line) and the axial coordinate of the aftercavity interaction region (dashed line) as functions of the magnetic field tapering parameter.
Axial dependence of the transit angle advance in the aftercavity region for two values of the magnetic field tapering parameter, (a) and (b).
(a) Axial dependence of the efficiency in the original version of a design; (b) gyrotron efficiency as the function of the magnetic field tapering parameter at the cavity exit and after launcher; solid lines show results for an ideal beam, dashed lines show results for a beam with 5% spread in electron orbital velocities; (c) axial dependence of the gyrotron efficiency for a beam with and without electron velocity spread.
Histograms characterizing the energy distribution in a spent beam in three cross sections: (a) the end of a cavity, , (b) the end of the uptaper, , and (c) the end of a launcher . Calculations are done for an ideal beam (no spread in electron velocities at the entrance).
The same histograms as in Fig. 9. Calculations are done for a beam with 5% RMS spread in electron orbital velocities at the cavity entrance.
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