Extension of high power deuterium operation of negative ion based neutral beam injector in the large helical device

DOI PDF 被引用文献3件 参考文献31件
  • K. Ikeda
    National Institute for Fusion Science (NIFS), National Institutes of Natural Sciences 1 , 322-6 Oroshi, Toki 509-5292, Japan
  • K. Tsumori
    National Institute for Fusion Science (NIFS), National Institutes of Natural Sciences 1 , 322-6 Oroshi, Toki 509-5292, Japan
  • K. Nagaoka
    National Institute for Fusion Science (NIFS), National Institutes of Natural Sciences 1 , 322-6 Oroshi, Toki 509-5292, Japan
  • H. Nakano
    National Institute for Fusion Science (NIFS), National Institutes of Natural Sciences 1 , 322-6 Oroshi, Toki 509-5292, Japan
  • M. Kisaki
    National Institute for Fusion Science (NIFS), National Institutes of Natural Sciences 1 , 322-6 Oroshi, Toki 509-5292, Japan
  • Y. Fujiwara
    National Institute for Fusion Science (NIFS), National Institutes of Natural Sciences 1 , 322-6 Oroshi, Toki 509-5292, Japan
  • S. Kamio
    National Institute for Fusion Science (NIFS), National Institutes of Natural Sciences 1 , 322-6 Oroshi, Toki 509-5292, Japan
  • Y. Haba
    Graduate School of Science, Nagoya University 3 , Nagoya 464-8603, Japan
  • S. Masaki
    The Graduate University for Advanced Studies, SOKENDAI 2 , 322-6 Oroshi, Toki 509-5292, Japan
  • M. Osakabe
    National Institute for Fusion Science (NIFS), National Institutes of Natural Sciences 1 , 322-6 Oroshi, Toki 509-5292, Japan

抄録

<jats:p>Second deuterium operation of the negative ion based neutral beam injector was performed in 2018 in the large helical device. The electron and ion current ratio improves to Ie/Iacc(D) = 0.31 using the short extraction gap distance of 7 mm between the plasma grid (PG) and the extraction grid (EG). The strength of the magnetic field by the electron deflection magnet installed in the EG increases by 17% at the PG ingress surface, which effectively reduces the electron component in the negative ion rich plasma in the vicinity of PG apertures. The reduction of the electron current made it possible to operate at a high power arc discharge and beam extraction. Then, the deuterium negative ion current increases to 55.4 A with the averaged current density of 233 A/m2. The thermal load on the EG using 7 mm gap distance is 0.6 times smaller than the thermal load using a 8 mm gap caused by the reduction of coextracted electron current. The injection beam power increases to 2.9 MW in the beam line BL3, and the total beam injection power increases to 7 MW by three beam lines in the second deuterium campaign.</jats:p>

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