DocumentCode :
1056322
Title :
High-power four-cavity S-band multiple-beam klystron design
Author :
Nguyen, Khanh T. ; Abe, David K. ; Pershing, Dean E. ; Levush, Baruch ; Wright, Edward L. ; Bohlen, Heinz ; Staprans, Armand ; Zitelli, Louis ; Smithe, David ; Pasour, John A. ; Vlasov, Alexander N. ; Antonsen, Thomas M., Jr. ; Eppley, Kenneth ; Petillo,
Author_Institution :
Beam Wave Res. Inc., Silver Spring, MD, USA
Volume :
32
Issue :
3
fYear :
2004
fDate :
6/1/2004 12:00:00 AM
Firstpage :
1119
Lastpage :
1135
Abstract :
We develop a methodology for the design of multiple-cavity klystron interaction circuits. We demonstrate our approach with the detailed design of a collector and a four-cavity circuit for a multiple-beam klystron (MBK) operating in the fundamental mode at a center frequency of 3.27 GHz (S-band). These elements are designed to be used with a 32-A 45-kV magnetically shielded eight-beam electron gun currently under fabrication . Upon integration of the gun, circuit, and collector, the MBK will be used for beam transport and beam-wave interaction studies and to validate developmental design codes and design methodologies. The device has a predicted gain of 33 dB at a peak pulsed output power of 750 kW with a corresponding electronic efficiency of 52%. For the present design, broad bandwidth is not a design objective, and the 3-dB bandwidth is 2.5%. Downstream of the output cavity, the magnetic field profile and the interior surface profile of the collector are carefully shaped to minimize the space-charge potential depression at the entrance to the collector, minimizing reflected electrons. The maximum calculated instantaneous power density on the walls of the collector is approximately 55 kW/cm2; at low duty cycles (<1.8%), the average power density is well within the limits for liquid cooling for pulse lengths up to 1.3 ms.
Keywords :
cavity resonators; electron guns; klystrons; microwave power amplifiers; space charge; 3.27 GHz; 32 A; 33 dB; 45 kV; 52 percent; 750 kW; S-band klystron; beam transport; beam-wave interaction; broad bandwidth; electron gun; electronic efficiency; four-cavity klystron; high-power klystron; instantaneous power density; interior surface profile; liquid cooling; magnetic field profile; multiple beam klystron; multiple-cavity klystron interaction circuits; pulsed output power; space-charge potential depression; Bandwidth; Circuits; Design methodology; Electrons; Fabrication; Frequency; Gain; Klystrons; Magnetic shielding; Power generation; Collector; MBA; MBK; klystron; multibeam; multiple-beam amplifier; multiple-beam klystron;
fLanguage :
English
Journal_Title :
Plasma Science, IEEE Transactions on
Publisher :
ieee
ISSN :
0093-3813
Type :
jour
DOI :
10.1109/TPS.2004.828884
Filename :
1321273
Link To Document :
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