Title :
Development of a high power and long pulse gyrotron with collector potential depression
Author :
Kasugai, A. ; Sakamoto, K. ; Tsuneoka, M. ; Takahashi, K. ; Maebara, S. ; Imai, T. ; Kariya, T. ; Okazaki, Y. ; Hayashi, K. ; Mitsunaka, Y. ; Hirata, Y.
Author_Institution :
JAERI, Ibaraki, Japan
Abstract :
A design and experimental results of a 110 GHz gyrotron with a single stage depressed collector are presented. By recovering a spent beam energy, efficiency of the gyrotron was improved from 30% to 50% with the RF output power of 610 kW and the pulse duration of 50 ms. A stable 5 sec oscillation was performed at 350 kW (output energy 1.75 MJ) with high efficiency of /spl sim/48% and the 420 kW-3.3 sec oscillation was also obtained. Conditioning time was short compared with the conventional gyrotron since a collector heat load was significantly reduced by the application of the beam retarding voltage.<>
Keywords :
electron beams; gyrotrons; millimetre wave generation; millimetre wave tubes; 110 GHz; 50 ms; 50 percent; 610 kW; RF output power; beam retarding voltage; collector heat load; collector potential depression; conditioning time; efficiency; long pulse gyrotron; pulse duration; single stage depressed collector; spent beam energy; Atom optics; Electrons; Fusion reactors; Gyrotrons; Optical pulses; Power generation; Power supplies; Pulsed power supplies; Radio frequency; Voltage;
Conference_Titel :
Electron Devices Meeting, 1994. IEDM '94. Technical Digest., International
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-2111-1
DOI :
10.1109/IEDM.1994.383422
