Amplifiers – Parametric amplifiers – Semiconductor type
Patent
1982-06-16
1985-08-06
Buczinski, S. C.
Amplifiers
Parametric amplifiers
Semiconductor type
315 3, 315 513, 315 535, 330 47, H01S 100, H01J 2308
Patent
active
045338752
ABSTRACT:
A high power amplifier for amplifying millimeter-wave radiation comprising: a length of metallic waveguide tapered from a small cross-sectional end to a larger cross-sectional end; a magnetron-type electron injection gun for injecting a spiral beam of relativistic electrons at the small end of the waveguide for propagation axially therein so that the wall radius of the tapered waveguide increases in the downstream direction of the electron beam; an input coupler for launching electromagnetic waves to be amplified into the waveguide at the large waveguide end thereof such that the individual frequencies in the input waves are reflected at various points along the constriction of the waveguide taper so that they copropagate with and are amplified by the electron beam; and a magnetic circuit for generating an axial magnetic field within the tapered waveguide with a unique profile approximately in accordance with the following equation to maintain synchronism: ##EQU1## where the z subscript is the waveguide axial direction, the .perp. subscript designates the direction perpendicular to this axial direction, and the o subscript represents those quantities at the entrance point for the electron beam into the waveguide.
This device has been found experimentally to have negligible launching loss and low sensitivity to electron velocity spread.
REFERENCES:
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patent: 4370621 (1983-01-01), Sprangle et al.
patent: 4480234 (1984-10-01), Wachtel
Lau "Collective-Interaction Klystron"; Physical Review Letters, vol. 53, No. 4, 23 Jul. 1984; pp. 395-398.
Maximum Amplification Band of a CRM Twistron by M. A. Molseev vol. 20, No. 8, pp. 1218-1223, Aug. 1977.
NRL Memorandum Report 4346 (Dec. 10, 1980) by Y. Y. Lau and K. R. Chu.
Gyrotron Traveling Wave Amplifier: III by Y. Y. Lau and K. R. Chu; International Journal of Infrared and Millimeter Waves, vol. 2, No. 3, 1981.
Gyrotron Traveling Wave Amplifier: I. Analysis of Oscillations by Y. Y. Lau, K. R. Chu, L. R. Barnett and V. L. Granatstein International Journal of Infrared and Millimeter Waves, vol. 2, No. 3, 1981.
Barnett Larry R.
Chu Kwo R.
Granatstein Victor L.
Lau Yue-Ying
Beers Robert F.
Buczinski S. C.
Ellis William T.
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