Travelling wave tubes

Details Travelling wave tubes Travelling wave tubes

1984-10-09

1987-04-14

Moore, David K.

Electric lamp and discharge devices

Electrode and shield structures

Cathodes containing and/or coated with electron emissive...

313341, 313346DC, 315 35, 315343, H01J 114

Patent

active

046581812

ABSTRACT:
The invention provides a travelling wave tube having a directly heated cathode. Cathode material is applied in a depression in one U-shaped member of a high resistance alloy material and the return path for heater current is provided by another U-shaped strip member beneath the first. The configurations of the two strip members are similar so that stray magnetic fields generated by the equal but opposite currents flowing therein, tend to neutralize one another. In another embodiment the two strip members are replaced by generally cylindrical members, one member being within the other. The surface of the member providing the return path for heater current is polished where it faces the member carrying the cathode material so as to reflect back heat radiated by the last-mentioned member.

REFERENCES:
patent: 3633062 (1972-01-01), Tamura
patent: 4129801 (1978-12-01), Soeno et al.
patent: 4310777 (1982-01-01), Fukushima et al.
patent: 4349766 (1982-09-01), Ando et al.
patent: 4388551 (1983-06-01), Ray
patent: 4459322 (1984-07-01), Lin
patent: 4471267 (1984-09-01), Amboss
patent: 4553064 (1985-11-01), Amboss
J. Turnbull, One-Piece Bimetal Cathode Cup and Sleeve, Jul. 23, 1976, 1-2, RCA.

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