Plasma and Fusion Research
Volume 6, 2402107 (2011)
Regular Articles
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
- 1)
- Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China
Abstract
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.
Keywords
HL-2A, NBI, deuterium, energetic ion, neutron, beam blip
Full Text
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This paper may be cited as follows:
Mitsutaka ISOBE, Yi LIU, Guoliang YUAN, Yipo ZHANG, Jinwei YANG, Wei CHEN, Qingwei YANG, Xuru DUAN, Shigeru MORITA and Kazuo TOI, Plasma Fusion Res. 6, 2402107 (2011).