Present status of the development and procurement on neutral beam injectors for JT-60 SA

Hanada, Masaya; Kojima, Atsushi; Akino, Noboru; Komata, Masao; Mogaki, Kazuhiko; Sasaki, Shunichi; Nemoto, Shuji; Shimizu, Tatsuo; Ozeki, Masahiro; Oasa, Kazumi; Watanabe, Kazuhiro; Kashiwagi, Mieko; Tobari, Hiroyuki; Endo, Yasuei

This paper reports the present status of the research and developments to realize the neutral beam (NB) injectors for JT-60 SA where a total injection power and pulse duration time are 34 MW and 100 s, respectively. The research and development for the positive-ion-based NB injector has been well in progress, which ensures to inject 24 MW, 85 keV for 100 s from twelve injectors. As for the negative-ion-based NB (N-NB) injector, the performance of the negative ion beam has been energetically improved by modifying the JT-60 negative ion source to realize a 10 MW, 500 keV for 100 s. The achievements of the beam performance fulfills the beam current of 22A, the beam energy of 500 keV, pulse duration time of 100 s required for JT-60 SA independently. In addition, the long pulse production of the high-current beam is being tested, where 15 A of the high-current beam is produced for 100 s.