CST – Computer Simulation Technology

Title:
Gyrotron Research at Forschungszentrum Karlsruhe
Author(s):
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
Source:
German Microwave Conference - GeMiC 2006 -
Vol./Issue/Date:
1st January 0001
Year:
2006
Page(s):
4
Keywords:
gyrotron, coaxial cavity, quasi-optical system, diamond window, mode converter, depressed collector
Abstract:
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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