Quasi-optical gyrotron having an electron gun with alternating h

Details Quasi-optical gyrotron having an electron gun with alternating h Quasi-optical gyrotron having an electron gun with alternating h

1990-08-22

1992-07-28

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Combined cathode ray tube and circuit element structure

315 531, 315 533, 313338, 313346R, 313352, H01J 2307, H01J 2956, H03B 901

Patent

active

051343436

ABSTRACT:
For the purpose of generating an electron beam (5), a quasi-optical gyrotron comprises an electron-beam gun (1) with an annular cathode (2). The electron beam (5) passes along an electron beam axis (6) and in so doing is compressed by a static magnetic field and forced into gyration, so that it excites in a quasi-optical resonator a standing alternating electromagnetic field of specific wavelength. The resonator exhibits two mirrors (9a, 9b) arranged opposite to one another on a resonator axis (8) aligned perpendicular to the electron beam axis (6). In order to increase the efficiency of the gyrotron, the annular cathode (2) alternately exhibits segments of high and low emitting power such that the electron beam (5) has an azimuthally varying current density, values of low current density in the resonator coinciding spatially with nodal surfaces of the standing alternating electromagnetic field.

REFERENCES:
patent: 2627050 (1953-01-01), Bezy
patent: 3278791 (1966-10-01), Favre
Proceedings of the Twelfth International Conference on Infrared and Millimeter Waves, Dec. 14-18, 1987, pp. 238-239, T. A. Hargreaves, et al., "The NRL Quasi-Optical Gyrotron Experiment".
Proceedings of the 13th International Conference on Infrared and Millimeter Waves, Dec. 5-9, 1988, pp. 279-280, M. E. Read, et al., "Design of a Quasi-Optical Gyrotron with a Sheet Electron Beam".
RCA Technical Notes, No. 1198, Feb. 3, 1978, pp. 1-3, I. Shidlovsky, "Dispenser Cathode with Limited Emitting Area".
Brown Boveri Review No. 6-1987, pp. 3-7, H. G. Mathews, et al., "The Gyrotron-A Key Component of High-Power Microwave Transmitters".
IEDM 83, pp. 448 to 451, IEEE 1983, L. R. Falce, "Dispenser Cathodes: The Current State of the Technology".
Int. Conf. on Microwave Tubes in Systems, Problems and Prospects, Oct. 22-23, 1984, pp. 35-41, B. Latini, et al., "Performance Analysis of Three Different M-Type Dispenser Cathodes".

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