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M. Hanada, N. Akino, N. Ebisawa, Y. Fujiwara,
A. Honda, T. Itoh, K. Kawai, M. Kazawa,
M. Kuriyama, K. Miyamoto, K. Mogaki, T. Ohga,
Y. Okumura, H. Oohara, K. Oomori, K. Usui, and
K. Watanabe
Japan Atomic Energy Research Institute, 801-1 Mukohyama, Naka-machi, Naka-gun, Ibaraki-ken 311-0193, Japan
Abstract. High energy and high power negative ion sources and accelerators
have been developed for neutral beam (NB) injectors of future fusion
machines such as International Thermonuclear Experimental Reactor (ITER).
Using a 5-stage electrostatic accelerator, negative ion beam has been
successfully accelerated up to the energy of 1 MeV, which is the required
energy for ITER. Powerful negative ion beams of 18.5 A, 360 keV
H-
and 14.3 A, 380 keV
D- have been produced with a high arc efficiency
of 0.11 A/kW at a low source pressure of 0.15 Pa in JT-60 negative ion
sources, and neutral beams of 5.2 MW have been injected into the plasma.
Continuous operation of a Cs-seeded negative ion source has also been
demonstrated for 140 hours, which is equivalent to the half year operation
in the ITER-NB system.
IAEA 2001
