DocumentCode :
3009777
Title :
Millimeter wave, 25 kW CW gyrotrons using permanent-magnets
Author :
McDermott, D.B. ; Luhmann, N.C.
Author_Institution :
Dept. of Appl. Sci., California Univ., Davis, CA, USA
fYear :
1996
fDate :
3-5 June 1996
Firstpage :
208
Abstract :
Summary form only given. Two compact 25 kW CW, low magnetic field gyrotrons have been designed for use in Ka-Band and W-Band systems. Both 50 kV devices have been designed to minimize their size and weight by using a 4.5 kG Samarium Cobalt permanent magnet. Their designs are presented. The 35 GHz gyrotron uses a 3 A MIG and operates at the third harmonic in the TE/sub 411/ mode of a smooth-bore cylindrical cavity. For an output power of 25 kW, the predicted conversion efficiency is 25%, yielding an output efficiency of 17%. An ideal 33 kV single-stage depressed collector following a magnetic downtaper could increase the device efficiency to 50%. The 94 GHz gyrotron utilizes a Cusp gun and operates at the eighth-harmonic in a sixteen-vane slotted cavity. The efficiency of the 95 GHz gyrotron is predicted to be 10%, which could also be boosted to /spl sim/50% with a depressed collector. Either device can be reconfigured as a tunable gyro-BWO. Mode competition is controlled in both gyrotrons by slicing the cavities to interrupt the azimuthal wall currents of unwanted modes as utilized recently in our successful second-harmonic TE/sub 21/ gyro-TWT amplifier experiment.
Keywords :
gyrotrons; 10 percent; 17 percent; 25 kW; 25 percent; 3 A; 33 kV; 35 GHz; 4.5 kG; 50 kV; 50 percent; 94 GHz; CW gyrotrons; Cusp gun; Ka-band; Sa-Co permanent magnet; Sm-Co; TE/sub 411/ mode; W-band; azimuthal wall currents; conversion efficiency; depressed collector; device efficiency; low magnetic field gyrotrons; magnetic downtape; millimeter wave gyrotrons; mode competition; output efficiency; output power; permanent-magnets; single-stage depressed collector; sixteen-vane slotted cavity; smooth-bore cylindrical cavity; third harmonic; tunable gyro-BWO; Cobalt; Contracts; Gyrotrons; Magnetic devices; Magnetic fields; Permanent magnets; Power generation; Samarium; Tellurium;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Plasma Science, 1996. IEEE Conference Record - Abstracts., 1996 IEEE International Conference on
Conference_Location :
Boston, MA, USA
ISSN :
0730-9244
Print_ISBN :
0-7803-3322-5
Type :
conf
DOI :
10.1109/PLASMA.1996.550907
Filename :
550907
Link To Document :
بازگشت