Plasma-assisted tube with helical slow-wave structure

Details Plasma-assisted tube with helical slow-wave structure Plasma-assisted tube with helical slow-wave structure

1994-05-13

1997-09-16

Lee, Benny T.

Electric lamp and discharge devices: systems

Combined load device or load device temperature modifying...

Distributed parameter resonator-type magnetron

315 393, 313 35, 313 36, H01J 2327, H01J 2561

Patent

active

056684428

ABSTRACT:
Microwave amplifiers are disclosed having a hollow helix slow-wave structure coupled directly to input and output waveguides. This helix-waveguide coupling structure couples the TEM mode of the helix to the TE10 mode of the rectangular waveguides and also defines ports communicating with the helix interior. Heating of the helix during high-power operation can be removed by cooling liquid pumped through the helix via these ports. The helix is surrounded by a cylindrical housing containing a low-pressure ionizable gas which forms a plasma channel that focuses the electron beam without the need for surrounding magnetic structures. A plasma cathode electron gun is arranged to inject an electron beam through the helix. Backflowing ions from the housing are harmlessly absorbed into the face of the plasma cathode. The microwave amplifier is converted to a backward wave oscillator by coupling a load to one of the waveguides.

REFERENCES:
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patent: 3171053 (1965-02-01), Targ et al.
patent: 3309556 (1967-03-01), Lien
patent: 3617798 (1971-11-01), Marchese et al.
patent: 3663858 (1972-05-01), Lisitano
patent: 4138625 (1979-02-01), Koyama et al.
patent: 4585973 (1986-04-01), Finch et al.
patent: 4912367 (1990-03-01), Schumacher et al.
patent: 4916361 (1990-04-01), Schumacher et al.
Samuel Y. Liao, Microwave Devices and Circuits, Prentice Hall, Englewood Cliffs, 1990, pp. 382-398.

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