Grid structure for certain plural mode electron guns

Details Grid structure for certain plural mode electron guns Grid structure for certain plural mode electron guns

1982-06-14

1984-09-11

Moore, David K.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Combined cathode ray tube and circuit element structure

315 36, 315 529, 315 537, 313348, H01J 2534, H01J 146

Patent

active

044712677

ABSTRACT:
A cathode/grid assembly for effecting a dual power mode electron gun for use with a traveling wave tube. The conventional "shadow grid" is both electrically and mechanically isolated from the cathode. A variable voltage source is connected to the shadow grid to bias it slightly above or slightly below the cathode potential, depending on the power mode. The electron emitting surface area of the cathode is the same in both modes. By changing the bias on the shadow grid, the transverse beam temperature may be increased to compensate for the reduced space charge density of the low power mode. Thus, the diameter of the low power beam is substantially the same as the diameter of the high power beam. This ensures good beam transmission and high electron beam rf interaction in the low power mode.

REFERENCES:
patent: 2943234 (1960-06-01), Zitelli
patent: 2975317 (1961-03-01), Susskind
patent: 3160782 (1964-12-01), Rich
patent: 3812395 (1974-05-01), Scott
patent: 3818260 (1974-06-01), Elfe, Jr. et al.
patent: 3843902 (1974-10-01), Miram et al.
patent: 4023061 (1977-05-01), Berwick et al.
patent: 4321505 (1982-03-01), Miram et al.
Scherba, "High Efficiency Triple Mode Space Traveling-Wave Tube", Int'l Electron Devices Meeting, Dec. 1-3, 1975, Wash. D.C., IEEE Technical Digest 1975, pp. 423-425.

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