Operation of a 118 GHz - 0.5 MW gyrotron with cryogenic window: Design and long pulse experiments
Conference
·
OSTI ID:391210
- Thomson Tubes Electroniques, Velizy-Villacoublay (France); and others
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-Velizy for ECRH experiments on Tore Supra and TCV. The gyrotron operates in a TE{sub 22,6} cavity mode and provides a TEM{sub 00} mode, converted into a HE{sub 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-ohmic-loss cavity with an optimized non linear taper, a highly efficient internal quasi-optical mode converter, 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.
- OSTI ID:
- 391210
- Report Number(s):
- CONF-951240--
- Country of Publication:
- United States
- Language:
- English
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