Plasma startup by neutral beam injection in the Large Helical Device
O. Kaneko; Y. Takeiri; K. Tsumori; Y. Oka; M. Osakabe; H. Funaba; S. Morita; B.J. Peterson; S. Sakakibara; K. Tanaka; T. Mutoh; M. Sato; K. Ohkubo; A. Komori; H. Yamada; N. Ohyabu; K. Kawahata; O. Motojima; O. Kaneko; National Institute for Fusion Science, Oroshi, Toki, Japan; Y. Takeiri; National Institute for Fusion Science, Oroshi, Toki, Japan; K. Tsumori; National Institute for Fusion Science, Oroshi, Toki, Japan; Y. Oka; National Institute for Fusion Science, Oroshi, Toki, Japan; M. Osakabe; National Institute for Fusion Science, Oroshi, Toki, Japan; H. Funaba; National Institute for Fusion Science, Oroshi, Toki, Japan; S. Morita; National Institute for Fusion Science, Oroshi, Toki, Japan; B.J. Peterson; National Institute for Fusion Science, Oroshi, Toki, Japan; S. Sakakibara; National Institute for Fusion Science, Oroshi, Toki, Japan; K. Tanaka; National Institute for Fusion Science, Oroshi, Toki, Japan; T. Mutoh; National Institute for Fusion Science, Oroshi, Toki, Japan; M. Sato; National Institute for Fusion Science, Oroshi, Toki, Japan; K. Ohkubo; National Institute for Fusion Science, Oroshi, Toki, Japan; A. Komori; National Institute for Fusion Science, Oroshi, Toki, Japan; H. Yamada; National Institute for Fusion Science, Oroshi, Toki, Japan; N. Ohyabu; National Institute for Fusion Science, Oroshi, Toki, Japan; K. Kawahata; National Institute for Fusion Science, Oroshi, Toki, Japan; O. Motojima; National Institute for Fusion Science, Oroshi, Toki, Japan
Журнал:
Nuclear Fusion
Дата:
1999-09-01
Аннотация:
Plasma was successfully built up by neutral beams alone in LHD. After injecting 1.6 MW neutral beams through a low density neutral gas target of 10<sup>-3</sup>Pa for about 0.3 s, fully ionized plasma of 10<sup>18</sup> m<sup>-3</sup> was generated. Keeping the beams on, additional gas puff could increase the plasma density sufficiently for absorption of the beam, and a dense plasma of 5 × 10<sup>19</sup> m<sup>-3</sup> was sustained afterwards. This technique is specific to a helical system that has a vacuum confining magnetic field structure, and no other assisting heating tools are required such as ECH, which has been used for producing target plasma with NBI.
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