Author :
Shimozuma, T. ; Takahashi, H. ; Ito, S. ; Kobayashi, S. ; Kubo, S. ; Yoshimura, Y. ; Igami, H. ; Nishiura, M. ; Ogasawara, S. ; Makino, R. ; Mizuno, Y. ; Okada, K. ; Takita, Y. ; Ito, Y. ; Mutoh, T. ; Minami, R. ; Kariya, T. ; Imai, T.
Abstract :
Three Mega-Watt 77GHz gyrotrons were developed for an ECRH system in LHD. Their operation could be highly optimized by means of two-step rise of an anode voltage. Output power of 1.78MW with 37.9% efficiency were obtained in the 3rd gyrotron. The system improvement has been promoted including the development of a mmw-beam position and profile monitor.
Keywords :
Tokamak devices; gyrotrons; plasma radiofrequency heating; ECRH; anode voltage; frequency 77 GHz; gyrotrons; high efficiency operation; high power operation; large helical device; mmw-beam position; power 3 MW; profile monitor; Anodes; Gyrotrons; Millimeter wave technology; Monitoring; Plasmas; Power generation; Power supplies;
