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Abstract

Gyrotrons at high frequency with high-output power are mainly developed for microwave heating and current drive in plasmas for thermonuclear fusion. For the stellarator Wendelstein 7-X, now under construction, a 10MW electron-cyclotron-resonance-heating (ECRH) system is foreseen. A 1MW 140GHz gyrotron with synthetic diamond window for continuous wave operation and with a single stage depressed collector for energy recovery and improvement of efficiency has been designed, constructed and tested. After some problems with the RF-load, long-pulse operation was performed. The pulsemengths were mainly determined by the preset values. Only for the 100-s pulse at 0.74MW, a limitation was found due to a pressure increase beyond about 10{-7} hPa. The ITER task on development of coaxial cavity gyrotrons ended in 2001. Their potential was investigated and data necessary for an industrial realisation of a 2MW CW 170GHz tube were obtained. In addition the results of first work on tube integration are discussed. By biasing the coaxial insert a fast frequency tuning has been demonstrated, and at the nominal mode a continuous frequency variation within the bandwidth of up to 70MHz has been done.

Additional information

Authors: KUNTZE M ET AL, Forschungszentrum Karlsruhe, Association EURATOM-FZK, Institut für Hochleistungsimpuls- und Mikrowellentechnik, Karlsruhe (DE);ALBERTI S, Centre de Recherches en Physique des Plasmas, Association EURATOM-Confédération Suisse, Ecole Polytechnique Fédérale de Lausanne (CH);TRAN M Q, Centre de Recherches en Physique des Plasmas, Association EURATOM-Confédération Suisse, Ecole Polytechnique Fédérale de Lausanne (CH);GIGUET E, Thales Electron Devices, Vélizy-Villacoublay (FR);LeCLOAREC G, Thales Electron Devices, Vélizy-Villacoublay (FR);LeGOFF Y, Thales Electron Devices, Vélizy-Villacoublay (FR);THUMM M K, Universität Karlsruhe, Institute für Hochfrequenztechnik und Elektronik, Karlsruhe (DE)
Bibliographic Reference: An article published in: IEEE Transactions on Plasma Science, Vol 31, No 1, February 2003, pp. 25-31
Availability: Available free of charge from: École Polytechnique Fédérale de Lausanne (EPFL), Ecublens, CH-1015 Lausanne Fax +41-21-6934747
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