GB747650A - High frequency klystron tube construction - Google Patents

Abstract

747,650. Velocity-modulated tubes. SPERRY CORPORATION. Dec. 11, 1953 [Jan. 30, 1953], No. 34555/53. Class 39 (1). A klystron has within the envelope a tubular metallic aligning element 41, Fig. 1, of unitary construction which defines one of the outer walls of cavity resonator 14 and the gun is secured to insulating support means 59, the means 59 engaging the inner wall surface of the member 41 to maintain the gun coaxial with 41, 14. In the reflex klystron shown the reflector, drift tube and gun sub-assemblies 34, 13, 11 are carried from metallic aligning member 41. In assembly flexible resonator wall 33 is brazed to tube 32, using a jig to keep the parts coaxial, and grid 16 is welded to 33. Reflector 17 is inserted within dielectric body 34, a metal ring 38 is slipped over the end 37 and soldered thereto, keeping 38 and 36 against body 34, so that on cooling the parts are tightly held together. Lead 39 is welded to the reflector, and the reflector structure with ring of solder 40 is inserted into metal tube 32 and heated to melt the solder after which the lower end 31 of the differential screw tuning mechanism 29, 30, 31 is welded to tube 32. The entire reflector subassembly is now inserted into metallic aligning member 41 from the larger end thereof and moved up until diaphragm 33 can be welded to the smaller flanged end of 41, using a jig to keep the parts coaxial. The drift tube subassembly is then constructed by welding or brazing together smoother grid 12, washers 48, 49, tapered member 46 and resonator grid 15, the assembly is inserted into 41 and washer 48 is tack welded thereto, a jig being used to keep the members coaxial and for the insertion. Aligning member 41 carrying the two subassemblies is inserted into metal envelope 19 to the position shown in Fig. 1, reflector lead 39 is welded to metal sleeve 50, and member 41 is brazed to semi-annular metal body 22, washers 48, 49 are permanently brazed to 41 and diaphragm 51 which maintains the vacuum is brazed in position. The gun sub-assembly, comprising cathode 52 carried by metal foil member 57 and focusing electrode 53 is now constructed by welding the parts together, using a jig to ensure coaxial alignment. Support members 57, 58 after being spot welded together are riveted to dielectric disc 59; the latter is provided with U-shaped wire elements 60 which are spot welded to support 62. The gun assembly is carried from a header (not shown) by three springs 66. The entire gun subassembly is then inserted into aligning member 41 until it contacts three or more tabs 67 and reflector lead 68 fits within metal sleeve 50. Flanges on the header and envelope 19 are then brazed together to seal the tube. The aligning member 41 is drawn from a flat piece of metal. The output is taken from rectangular coupling aperture 26 to rectangular guide section 21 having sealed-off window 18. Semi-annular metal body 22 conducts heat to envelope 19 which can be air-cooled.