Gyrotron Research at Forschungszentrum Karlsruhe
G. Dammertz, A. Arnold, D. Bariou, E. Giguet, R. Heidinger, S. Illy, J. Jin, F. Legrand, W. Leonhardt, C. Lievin, G. Neffe, B. Piosczyk, T. Rzesnicki, M. Schmid, M. Thumm
German Microwave Conference - GeMiC 2006 -
1st January 0001
gyrotron, coaxial cavity, quasi-optical system, diamond window, mode converter, depressed collector
One of the important heating schemes for fusion plasma devices is given by the electron-cyclotron-resonanceheating. This application, however, is limited to the lack of powerful sources operated at the appropriate frequency. At the Forschungszentrum Karlsruhe, a 1 MW, 140 GHz gyrotron for continuous wave operation has been developed for the ECRH system built up at the new stellarator facility in Greifswald / Germany. Due to the successful results with the prototype, seven 140 GHz CW gyrotrons were ordered. The first series tube was operated at the Forschungszentrum Karlsruhe. A power of 920 kW at an efficiency of 45 % (with energy recovery) could be obtained for pulse lengths of 180 s (limited by the available highvoltage power supply). A 30 minute pulse was performed with an output power of 570 kW. For the next fusion plasma device ITER, gyrotrons with higher output power of about 2 MW are desirable. In short-pulse experiments, the feasibility of coaxialcavity gyrotrons with an output power up to 2 MW in continuous wave operation has been demonstrated and the information for a technical design has been obtained.
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