High Performance of Neutral Beam Injectors for Extension of LHD Operational Regime
Fusion Science and Technology / Volume 58 / Number 1 / July/August 2010 / Pages 482-488
Chapter 9. Neutral Beam Interaction / Special Issue on Large Helical Device (LHD) / dx.doi.org/10.13182/FST10-A10834
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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.
