GB918586A - High power klystron tube apparatus - Google Patents

Abstract

918,586. Velocity-modulated tubes. VARIAN ASSOCIATES. Dec. 9, 1959 [Jan. 15, 1959], No. 41941/59. Class 39 (1). A high-power klystron tube comprises an electron collector, an R.F. output window structure associated with an output cavity resonator, a body portion comprising a gun anode, a plurality of cavity resonators including the output cavity resonator and at least one drift tube and a tube connecting the output cavity resonator with the electron collector's body, cooling means for circulating cooling fluid to a plurality of the body components said means including at least two flow portions in parallel and collector cooling means for circulating cooling fluid to the electron collector in fluid flow in parallel with the flow through the body cooling means. There are three watercooling paths in parallel: (a) 105 for the window 63 in the output guide; (b) for the collector 55; (c) for the drift tubes, gun anode and timing piston and diaphragm in the output resonator. The drift tube 33, Fig. 3, is cooled more intensively than the other drift tubes. The collector has a helical cooling channel 139, channel 136 of diminishing width and conical channel 142 of increasing width, in order to obtain a uniform temperature over the collector in spite of unequal impingement of electrons on equal areas thereof. Each resonator (four in all) has a water-cooled inductive tuning piston the output resonator is cylindrical, the others rectangular. The output waveguide has an impedance matching baffle 59 and the window 63 is of aluminium oxide and is #/2 in diameter. Polepieces 72, 73 are integral with the tube envelope. The first three cavity resonators may be stagger tuned, the cathode and focusing electrode subassembly are aligned and spaced from the gun anode 27 by brazing 14 to polepiece 72 and temporarily sealing 13 to 14 so that mandrel(s) can be inserted. Ceramic cylinder 18 is brazed to corona shield 172, Fig. 2A, a U- shaped member 173 is inserted and members 171, 174 are made to abut and are sealed by a heliarc weld while a mandrel maintains transverse alignment of cathode and focusing electrode with gun anode. Next 173, 174 are sealed together to define the longitudinal spacing of cathode and focusing electrode from gun anode. The seal 13-14 can now be broken and the mandrel(s) removed, after which it is resealed by a heliarc weld; window 63, Fig. 3, is also sealed by a heliarc weld. The cathode has a heat shield 45, and the cathode heater is pulsed for pulsed operation. Specification 918,587 is referred to.