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Operation and Development on the Positive-Ion Based Neutral Beam Injection System for JT-60 and JT-60U

M. Kuriyama, N. Akino, N. Ebisawa, A. Honda, T. Itoh, M. Kawai, K. Mogaki, T. Ohga, H. Oohara, N. Umeda, K. Usui, M. Yamamoto, T. Yamamoto, M. Matsuoka

Fusion Science and Technology / Volume 42 / Number 2,3 / September 2002 / Pages 424-434

Technical Paper

The positive-ion based neutral beam injection (NBI) system for JT-60, which consists of 14 beamline units and has a beam energy of 70 to 100 keV, started operation in 1986 with hydrogen beams and injected a neutral beam power of 27 MW at 75 keV into the JT-60 plasma. In 1991, the NBI system was modified to be able to handle deuterium beams as part of the JT-60 upgrade modification. After executing some research and developments, deuterium beams of 40 MW at 95 keV were injected in 1996. As a result, NBI has contributed to the achievement of the highest performance plasmas, a DT-equivalent fusion power gain of 1.25 and a fusion triple product of 1.55 × 1021 keVs/m3, in the world on JT-60U.

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