Operation of a 118 GHz - 0.5 MW gyrotron with cryogenic window : Design and long pulse experimentsFunded under: EAEC-FUSION 12C
A 210 s, 0.5 MW, 118 GHz gyrotron with a cryogenic window has been designed, constructed and tested as a joint collaboration between CEA-Cadarache, CRPP-Lausanne, FZK-Karlsruhe and TTE-Vélizy for ECRH experiments on Tore Supra and TCV. The gyrotron operates in a TE(22.6) cavity mode and provides a TEM(00) mode, converted into a HE(11) mode in an external optics unit. It is composed of a triode-type electron gun, an improved beam tunnel, a high mode purity, low ohmics loss cavity with an optimised non-linear taper, a highly efficient internal quasi-optical mode convertor, a large collector with a beam sweeping magnet, and a horizontal RF output through a liquid nitrogen edge-cooled single-disk sapphire window. Output powers of 0.7 MW-0.1 s and 0.5 MW-2 s have been achieved with the desired frequency, efficiency and mode pattern.
Bibliographic Reference: Article: Proceedings of the 20th International Conference on Infrared and Millimeter Waves (1995) pp. 11-12
Record Number: 199511519 / Last updated on: 1995-12-12
Original language: en
Available languages: en