Electric lamp and discharge devices: systems – Cathode ray tube circuits – Combined cathode ray tube and circuit element structure
Patent
1984-03-12
1985-11-26
Chatmon, Saxfield
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Combined cathode ray tube and circuit element structure
313442, 315 35, H01J 2308
Patent
active
045556466
ABSTRACT:
A permanent-magnet-focused linear-beam high power millimeter-wave tube is externally adjustable for optimum electron beam optics during initial tube operation. The adjustment is made possible by providing an enlarged cavity within the cathode polepiece within which is housed a confined-flow magnetically-focused electron gun, and a cylindrical insert of magnetic material axially symmetrically disposed about the gun and in spaced relationship to and adjacent the gun insulator envelope. The insert may comprise iron or a radially magnetized permanent magnet, either alone or in combination, and more than one insert of magnetic material may be concentrically employed. In this manner, and by movement of the insert axially within the cavity toward and away from the gun, a finely controllable smooth adjustment of the beam diameter in the beam-microwave interaction region of the tube is effected over a wide range during initial operation. Substantially only the magnetic field in the vicinity of the gun is affected, and essentially no scalloping degradation of the beam in the interaction region is observed.
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Miram George V.
Mizuhara Yosuke M.
Chatmon Saxfield
Cole Stanley Z.
Sgarbossa Peter J.
Varian Associates Inc.
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