Electric lamp and discharge devices – Cathode ray tube – Ray generating or control
Patent
1983-08-30
1985-11-12
Smith, William F.
Electric lamp and discharge devices
Cathode ray tube
Ray generating or control
313449, 313460, 313348, 313349, 315 35, 315 36, H01J 2948
Patent
active
045530645
ABSTRACT:
A dual-mode electron gun for a traveling-wave tube is disclosed which selectively generates an electron beam of two different cross-sectional areas. The electron gun includes radially inner and annular control grids as well as a shadow grid disposed between the cathode and the control grids along the electron beam path. The shadow grid is provided with a suppressor ring which precludes electron emission from an annular portion of the cathode immediately radially outwardly of the cathode region over which the inner control grid projects, thereby eliminating generation of a spurious beam portion radially outwardly from the desired smaller cross-section beam.
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Hechtel et al., "A Dual Mode Electron Gun Having Non-Intercepting Grids", 1973, IEDM Technical Digest, pp. 171-174.
Coble Paul M.
Hughes Aircraft Company
Karambelas A. W.
Smith William F.
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