H - Electricity – 01 – J
Patent
H - Electricity
01
J
353/3
H01J 23/087 (2006.01) H01J 23/065 (2006.01)
Patent
CA 1213054
- 26 - Abstract Adjustable-Beam Permanent-Magnet-Focused Linear Beam Microwave Tube 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 pro- viding an enlarged cavity within the cathode pole- piece within which is housed a confined-flow mag- netically-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 concen- trically 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 degra- dation of the beam in the interaction region is observed.
412904
Miram George V.
Mizuhara Yosuke M.
R. William Wray & Associates
Varian Associates Inc.
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