Details

Autor(en) / Beteiligte

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

Titel

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

Ist Teil von

• Fusion science and technology, 2010-08, Vol.58 (1), p.482-488

Ort / Verlag

Taylor & Francis

Erscheinungsjahr

2010

Quelle

Taylor & Francis

Beschreibungen/Notizen

• 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.