PROGRESS IN THE DEVELOPMENT OF THE 170 GHz COAXIAL CAVITY GYROTRON FOR ITER

B. Piosczyk^1a S. Alberti³, D. Bariou⁴ , P. Benin⁴, T. Bonicelli⁵,

G. Dammertz^1a, O. Dumbrajs⁶, D. Fasel³, E. Giguet⁴, T. Goodman³,

R. Heidinger^1b, M. Henderson³, J.P. Hogge³, S. Illy^1a, J. Jin^1a, C. Lievin⁴, G. Michel⁷, P.L. Mondino⁵, L. Porte³, T. Rzesnicki^1a,

M. Thumm^1a,2, M.Q. Tran^3,5, X. Yang^1a, I. Yovchev³

¹Forschungszentrum Karlsruhe, Association EURATOM-FZK,

^aInstitut für Hochleistungsimpuls- und Mikrowellentechnik, ^bInstitut für Materialforschung I, Postfach 3640, D-76021 Karlsruhe, Germany,

²Universität Karlsruhe, Institut für Höchstfrequenztechnik und Elektronik,

D-76128 Karlsruhe, Germany

³Centre de Recherche en Physique des Plasmas, Association EURATOM-Confédération Suisse, EPFL Ecublens, CH-1015 Lausanne, Suisse

⁴Thales Electron Devices (TED), F-78141 Vélizy, France

⁵European Fusion Development Agreement (EFDA), D-85748 Garching, Germany

⁶ Department of Engineering Physics and Mathematics, Helsinki University of Technology, Association EURATOM TEKES, FIN-02150 Espoo, Finland

⁷ Max-Planck-Institut für Plasmaphysik, D-17491Greifswald, Germany

For use at ITER the European Fusion Development Agreement (EFDA) supports the development of a 2 MW, CW, 170 GHz coaxial cavity gyrotron in cooperation between European Research Institutions (FZK Karlsruhe, CRPP Lausanne, HUT Helsinki) together with European tube industry (TED, Velizy, France). The manufacturing phase of the first industrial prototype started in June 2004 and the delivery is expected for beginning of 2006. A superconducting magnet has been ordered and a facility for testing the gyrotron is under construction at CRPP Lausanne. The design of the gyrotron components has been done already. At FZK the 165 GHz (TE_31,17) short pulse (~few ms) coaxial cavity gyrotron has been modified for operation at 170 GHz (TE_34,19) in order to verify the design of critical component under relevant conditions. This pre-prototype gyrotron uses the same cavity and same quasi-optical RF-output system as designed for the industrial prototype and a very similar electron gun.

In the talk the status of the work on the industrial prototype will be reported and experimental results obtained with the pre-prototype will be presented and compared with design calculations.