Experimental results on the 140 GHz, 1 MW, CW gyrotrons for the stellarator W7-X

Author

Dammertz, G. ; Arnold, A. ; Borie, E. ; Illy, Stefan ; Alberti, S. ; Bariou, D. ; Brand, P. ; Braune, H. ; Erckmann, V. ; Gantenbein, G. ; Giguet, E. ; Heidinger, R. ; Hogge, J.-P. ; Kasparek, W. ; Koppenburg, K. ; Laqua, H. ; Legrand, F. ; Leonhardt, W.

Author_Institution

EURATOM-FZK, IHM, Eggenstein-Leopoldshafen, Germany

Volume

1

fYear

2005

fDate

19-23 Sept. 2005

Firstpage

235

Abstract

The development of high power gyrotrons (118 GHz, 140 GHz) in continuous wave operation (CW) has been in progress for several years in a joint collaboration between different European research institutes and industrial partners. In this frame, two 140 GHz prototype gyrotrons for CW operation had been constructed and tested at the Forschungszentrum Karlsruhe. According to the results of the prototypes, seven 140 GHz CW gyrotrons were ordered. The first tube was operated at the Forschungszentrum Karlsruhe. A power of 950 kW at efficiency of 43 % (with energy recovery) could be obtained for pulse lengths of 180 s (limited by the available high-voltage power supply). A 30 minute pulse was performed with an output power of 540 kW. During this pulse almost no decrease in performance was found, especially the tube pressure only increased in the range of 10^-9 mbar.

Keywords

gyrotrons; stellarators; 1 MW; 140 GHz; 180 s; 30 min; 43 percent; 540 kW; 950 kW; CW gyrotrons; continuous wave operation; high power gyrotrons; stellarator W7-X; Cathodes; Dielectric losses; Electron beams; Gyrotrons; Heating; Plasma devices; Plasma waves; Power generation; Prototypes; Pulsed power supplies;

fLanguage

English

Publisher

ieee

Conference_Titel

Infrared and Millimeter Waves and 13th International Conference on Terahertz Electronics, 2005. IRMMW-THz 2005. The Joint 30th International Conference on

Print_ISBN

0-7803-9348-1

Type

conf

DOI

10.1109/ICIMW.2005.1572495

Filename

1572495