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High Performance of Neutral Beam Injectors for Extension of LHD Operational Regime

Y. Takeiri, O. Kaneko, K. Tsumori, M. Osakabe, K. Ikeda, K. Nagaoka, H. Nakano, E. Asano, T. Kondo, M. Sato, M. Shibuya, S. Komada, LHD Experiment Group

Fusion Science and Technology

Volume 58 / Number 1 / July 2010 / Pages 482-488


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High-power negative and positive ion-based neutral beam injectors (NBIs) are operated with high reliability in the Large Helical Device (LHD). The total injection power is >20 MW, and such high-power beams are available every 3 min. The high performance of the LHD NBI system has extended the LHD parameter regime to levels equivalent to those obtained in large tokamaks. Three negative NBIs inject a total power of 16 MW with an energy of 180 keV, which is the world's highest power from a negative NBI system (H-), and one positive NBI (H+) injects 7 MW at 40 keV. The injection duration can be extended beyond 1 min with reduced power from the negative and positive NBIs, and long-pulse plasmas are successfully sustained with the NBIs. The structure and performance of the LHD NBI system is reviewed.

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