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High-harmonic gyrotron with sectioned cavity
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View: Figures


Image of FIG. 1.
FIG. 1.

Schematic of the sectioned microwave system consisting of (1) the input cavity, (2) the drift region, and (3) the output cavity. Typical axial structures of two neighboring eigenmodes are also shown.

Image of FIG. 2.
FIG. 2.

A regular cavity with a phase shift inside as an effective model of the sectioned cavity. The axial structure of the first eigenmode, and positions of various eigenmodes on the dispersion diagram in the cases of and .

Image of FIG. 3.
FIG. 3.

Schematic of the sectioned cavity, magnetic field profile, and results of simulations for the optimal regime: the total electron efficiency vs the axial coordinate, the axial structure of the rf field, and the efficiency of electron bunching vs the coordinate.

Image of FIG. 4.
FIG. 4.

Dispersion diagrams of parasitic transverse modes, which can be excited inside the regular part of the drift region at the fundamental (a) and the second (b) cyclotron harmonic, and numbers of axial modes, which are close to the electron-wave resonance. The dashed lines are electron cyclotron dispersion curves.

Image of FIG. 5.
FIG. 5.

Axial eigenmodes of the sectioned-cavity gyrotron at various lengths of the drift region, . The total and the output efficiencies vs the normalized frequency, as well as the magnetic field bands corresponding to the excitation of the modes.

Image of FIG. 6.
FIG. 6.

Axial structures of the first and second axial eigenmodes shown in Fig. 5.

Image of FIG. 7.
FIG. 7.

Output electronic efficiency vs the spread in electron pitch factor in the cases of uniform and profiled magnetostatic field.


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Scitation: High-harmonic gyrotron with sectioned cavity