Microwave tubes incorporating rare earth magnets

Details Microwave tubes incorporating rare earth magnets Microwave tubes incorporating rare earth magnets

1979-01-12

1980-09-16

Chatmon, Jr., Saxfield

Electric lamp and discharge devices: systems

Combined load device or load device temperature modifying...

Distributed parameter resonator-type magnetron

313 38, 313 46, 315 3951, 315 535, H01J 2550

Patent

active

042232465

ABSTRACT:
A microwave tube having a heated cathode with a rare earth magnet positioned inside the evacuated envelope of the tube and at least partially shielded from thermal radiation from the cathode and/or anode so that the magnet may be operated at elevated temperatures while protected from environment such as oxygen in the air to prevent degradation of the magnetic properties of the magnet at temperatures up to 500.degree. C. during processing of the tube or up to 250.degree. C. during operation of the tube with thermal shielding from the hot cathode preventing any surface of the magnet from exceeding such temperatures.

REFERENCES:
patent: 3989979 (1976-11-01), Konno et al.
patent: 4048542 (1977-09-01), Miura
patent: 4071804 (1978-01-01), Koinuma et al.

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