JT-60Uの加熱用中性粒子ビーム中の酸素量とプラズマ中の酸素量との関係  [in Japanese] Relation between the Oxygen Contents in the Neutral Beam and in the Core Plasma in JT-60U  [in Japanese]

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Author(s)

    • 仲野 友英 NAKANO Tomohide
    • 日本原子力研究所那珂研究所炉心プラズマ研究部 Naka Fusion Research Establishment, Japan Atomic Energy Research Institute
    • 小出 芳彦 KOIDE Yoshihiko
    • 日本原子力研究所那珂研究所炉心プラズマ研究部 Naka Fusion Research Establishment, Japan Atomic Energy Research Institute
    • 本田 敦 [他] HONDA Atsushi
    • 日本原子力研究所那珂研究所炉心プラズマ研究部 Naka Fusion Research Establishment, Japan Atomic Energy Research Institute
    • 梅田 尚孝 UMEDA Naotaka
    • 日本原子力研究所那珂研究所炉心プラズマ研究部 Naka Fusion Research Establishment, Japan Atomic Energy Research Institute
    • 秋野 昇 AKINO Noboru
    • 日本原子力研究所那珂研究所炉心プラズマ研究部 Naka Fusion Research Establishment, Japan Atomic Energy Research Institute
    • 東島 智 HIGASHIJIMA Satoru
    • 日本原子力研究所那珂研究所炉心プラズマ研究部 Naka Fusion Research Establishment, Japan Atomic Energy Research Institute
    • 竹永 秀信 TAKENAGA Hidenobu
    • 日本原子力研究所那珂研究所炉心プラズマ研究部 Naka Fusion Research Establishment, Japan Atomic Energy Research Institute
    • 久保 博孝 KUBO Hirotaka
    • 日本原子力研究所那珂研究所炉心プラズマ研究部 Naka Fusion Research Establishment, Japan Atomic Energy Research Institute

Abstract

The D_α spectral lines emitted from the neutral beam colliding with residual D_2 in a beam chamber were observed. The Doppler shifts of these D_α spectral lines indicate that the neutral beam includes deuterium atoms with energies of E, E/2, E/3 and E/9~E/11 (E : beam acceleration energy), which originate from D^+, D^+_2, D^+_3 and D_i0^+ (i=1,2,3), respectively. From the intensity ratio of the D^α spectral lines, the fraction of oxygen atoms to deuterium atoms was determined by the analysis on atomic and molecular processes in the neutralizer for the neutral beam. The neutral beam has been found to contain more than 8% of oxygen atoms over deuterium when the neutral beam injection starts. About 50% of the oxygen ions in the core plasma originate from the neutral beam. The oxygen content in the neutral beam decreases gradulally with its injection, and it reaches ~1% around 850 injections. At this time, the fraction of the oxygen ions in the core plasma originating from the neutral beam is less than 20%. In L-mode plasmas, the confinement time of the oxygen ions originating from the neutral beam is estimated to be 0.5 s, and is longer than that of the deuterium ions ( 0.3 s ).

The D<sub>α</sub> spectral lines emitted from the neutral beam colliding with residual D<sub>2</sub> in a beam chamber were observed. The Doppler shifts of these D<sub>α</sub> spectral lines indicate that the neutral beam includes deuterium atoms with energies of E, E/2, E/3 and E/9 ˜ E/11 (E : beamaccelerationenergy), which originate from D<sup>+</sup>, D<sup>+</sup><sub>2</sub>, D<sup>+</sup><sub>3</sub> and D<sub>i</sub>O<sup>+</sup> (i=1,2,3), respectively. From the intensity ratio of the D<sub>α</sub> spectral lines, the fraction of oxygen atoms to deuterium atoms was determined by the analysis on atomic and molecular processes in the neutralizer for the neutral beam. The neutral beam has been found to contain more than 8% of oxygen atoms over deuterium when the neutral beam injection starts. About 50% of the oxygen ions in the core plasma originate from the neutral beam. The oxygen content in the neutral beam decreases gradulally with its injection, and it reaches ˜ 1% around 850 injections. At this time, the fraction of the oxygen ions in the core plasma originating from the neutral beam is less than 20%. In L-mode plasmas, the confinement time of the oxygen ions originating from the neutral beam is estimated to be 0.5 s, and is longer than that of the deuterium ions ( 0.3 s ).

Journal

  • Journal of Plasma and Fusion Research

    Journal of Plasma and Fusion Research 81(9), 708-716, 2005-09-25

    The Japan Society of Plasma Science and Nuclear Fusion Research

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Codes

  • NII Article ID (NAID)
    110006281979
  • NII NACSIS-CAT ID (NCID)
    AN10401672
  • Text Lang
    JPN
  • Article Type
    ART
  • ISSN
    09187928
  • NDL Article ID
    7678140
  • NDL Source Classification
    ZM35(科学技術--物理学)
  • NDL Call No.
    Z15-8
  • Data Source
    CJP  NDL  NII-ELS  J-STAGE  NDL-Digital 
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