Title :
Frequency step-tunable 0.5 MW, 140 GHz gyrotron for fusion plasma applications
Author :
Kuntze, M. ; Gantenbein, G. ; Borie, E. ; Dammertz, G. ; Mobius, A. ; Nickel, H.-U. ; Piosczyk, B. ; Thumm, M.
Author_Institution :
Kernforschungszentrum Karlsruhe, Germany
Abstract :
Summary form only given. The state of development work at KfK Kernforschungszentrum Karlsruhe on 140-GHz high-power gyrotrons for EC wave applications is presented. In particular, the design and experimental results for a 0.5-MW TE/sub 10,4/ gyrotron with axial RF output coupling are discussed. An RF output power up to 0.69 MW at pulse lengths up to 5 ms has been obtained with an electronic efficiency of 31%. Experiments have shown that it is possible to use the aximuthal neighbors of the TE/sub 10,4/ mode TE/sub 9,4/ at 132.6 GHz and TE/sub 11,4/ at 147.3 GHz, as working modes, by decreasing and increasing the magnetic field, respectively (step frequency tuning). The achieved output power in TE/sub 9,4/ and TE/sub 11,4/ modes, 420 kW and 300 kW, respectively, is in good agreement with calculations assuming realistic beam properties and power reflections at the single disc (d = 5/2 /spl lambda/ = 2.76 mm) quartz output window which is optimized for 140.0 GHz.
Keywords :
gyrotrons; 0.5 MW; 140 GHz; 300 kW; 420 kW; EC wave applications; axial RF output coupling; electronic efficiency; frequency step-tunable gyrotron; fusion plasma applications; high-power gyrotrons; magnetic field; power reflections; quartz output window; realistic beam properties; Electron beams; Gyrotrons; Klystrons; Laser mode locking; Magnetic fields; Nonlinear equations; Plasma applications; Power generation; Power system harmonics; Radio frequency;
Conference_Titel :
Plasma Science, 1993. IEEE Conference Record - Abstracts., 1993 IEEE International Conference on
Conference_Location :
Vancouver, BC, Canada
Print_ISBN :
0-7803-1360-7
DOI :
10.1109/PLASMA.1993.593539
