Experimental Check of Deceleration of Neutral Beam-Injected Energetic Ions in the HL-2A Tokamak

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  • ISOBE Mitsutaka
    National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
  • LIU Yi
    Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China
  • YUAN Guoliang
    Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China
  • ZHANG Yipo
    Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China
  • YANG Jinwei
    Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China
  • CHEN Wei
    Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China
  • YANG Qingwei
    Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China
  • DUAN Xuru
    Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China
  • MORITA Shigeru
    National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
  • TOI Kazuo
    National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan

抄録

Short pulses of a deuterium neutral beam (NB) with a duration of less than ∼ 5 ms were co-injected into magnetohydrodynamic (MHD)-quiescent ohmic deuterium plasmas of the HL-2A tokamak to study the variation of the slowing-down time in two different electron temperature environments. Analyses were made for the decay rate of D-D neutrons produced by beam-plasma interaction following NB turn-off, i.e., experimentally observed neutron decay rates were compared with those predicted by a classical slowing-down model. The results suggest the beam ions decelerate without significant loss in the HL-2A tokamak in round terms. When the critical energy for beam ions is higher than the beam injection energy, it seems that a small fraction of the beam ions is lost.

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