Xiao-Tong Guan, Wen-Jie Fu, Dun Lu, Tong-Bin Yang, Yang Yan, Xue-Song Yuan. Design of second harmonic terahertz gyrotron cavity based on double confocal waveguide [J]. Acta Physica Sinica, 2020, 69(6): 068401-1
- Acta Physica Sinica
- Vol. 69, Issue 6, 068401-1 (2020)
Fig. 1. Cross section of quasi-optical waveguides in elliptic coordinate system: (a) Normal confocal waveguide; (b) double confocal waveguide.
Fig. 2. Transverse geometry with the annular electron beam and electric field distributions of TE0, 11 mode in two types of quasi-optical waveguides: (a) Normal confocal waveguide; (b) double confocal waveguide.
Fig. 3. Mode spectrum in double confocal waveguide.
Fig. 4. Double confocal cavity: (a) Structural diagram; (b) axial field profile of TE0,11,1 mode.
Fig. 5. Beam-wave coupling factors
as functions of electron beam radius R b for different modes in double confocal waveguides.
as functions of electron beam radius Fig. 6. Beam-wave coupling factors for TE0,11 mode in single and double confocal waveguide: (a) Radial distribution of coupling factor
; (b) azimuthal distribution of coupling factor Ls for an annular electron beam with R b = 1.65 mm.
; (b) azimuthal distribution of coupling factor Fig. 7. Calculated results of starting current I st (V 0 = 40 kV, α = 1.5, R b = 1.65 mm): (a) For different modes in double confocal cavity; (b) for
mode in double and single confocal cavity.
mode in double and single confocal cavity. Fig. 8. Simulation results of output field Ex and Ey for double confocal cavity: (a) Time variation; (b) spectrum.
Fig. 9. Simulation results of the distribution of electronic field Ex in double confocal cavity: (a) At output port; (b) at the xz plane (y = 0); (c) at the yz plane (x = 0).
Fig. 10. Simulation results of the distribution of electronic field Ey in double confocal cavity: (a) At output port; (b) at the xz plane (y = 0); (c) at the yz plane (x = 0).
Fig. 11. Simulation results for single confocal cavity: (a) Time variation of the output field Ex and Ey ; (b) spectrum of the output field Ex .
Fig. 12. Simulation results of output power for double confocal cavity and single confocal cavity.
Fig. 13. Expanded results of the output field Ex and Ey for double confocal cavity around 100 ns.
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Table 1. Design parameters of the proposed double confocal cavity.
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