Time dependent neutron emission rate analysis for neutral-beam-heated deuterium plasmas in a helical system and tokamaks

doi:10.1088/1361-6587/aad4b7

	Time dependent neutron emission rate analysis for neutral-beam-heated deuterium plasmas in a helical system and tokamaks
	Ogawa, Kunihiro 1,2; Isobe, Mitsutaka 1,2; Nishitani, Takeo 1; Seki, Ryosuke 1,2; Nuga, Hideo 1; Murakami, Sadayoshi 3; Nakata, Motoki 1,2; Pu, Neng 2; Osakabe, Masaki 1,2; Jo, Jungmin 4; Cheon, MunSeong 5; Kim, Junghee 5; Zhong, Guoqiang6 ; Xiao, Min 6; Hu, Liqun6
	2018-09-01
发表期刊	PLASMA PHYSICS AND CONTROLLED FUSION
ISSN	0741-3335
通讯作者	Ogawa, Kunihiro(kogawa@nifs.ac.jp)
摘要	A neutron emission rate analysis code called FBURN, based on the classical energetic ion confinement assumption with radial diffusion, is developed for the time-dependent analysis of the total neutron emission rate (S-n) in neutral beam (NB) heated deuterium plasmas. The time trend of S-n evaluated by FBURN shows good agreement with the S-n measured by the neutron flux monitor on the deuterium operation of the Large Helical Device. The dependence of S-n on line-averaged electron density (n(e)_(avg)) has a peak at n(e)_(avg) of around 2.5 x 10(19) m(-3) in both experiment and calculation. Here, the absolute value of S-n evaluated by calculation agrees with that obtained in experiments within a factor of two. A time trend analysis of S-n in an electron cyclotron heated plasma with a short pulse NB injection is performed. The analysis shows that the diffusion coefficient of co-going transit beam ions is 0.2 to 0.3 m(2) s(-1). In addition, the diffusion coefficient of helically trapped beam ions decreases from 5 to 3 m(2) s(-1) with the inward shift of the magnetic axis position. Time-resolved analysis of the triton burnup experiment shows that the diffusion coefficient of tritons is around 0.15 m(2) s(-1). It is found that the diffusion coefficients of the beam and tritons are of a similar value as obtained in JT-60U. The trend of the triton burnup ratio on the n(e)_(avg) calculated by the FBURN agrees with the experiments. The results suggest that the decrease of the triton burnup ratio with the increase of n(e)_(avg) is due to the shorter slowing down time of tritons by the decrease of the electron temperature, and the increase of the triton burnup ratio with the increase of n(e)_(avg) is due to the diffusion of tritons. Time trend analysis of S-n in the Korea Superconducting Tokamak Advanced Research and the Experimental Advanced Superconducting Tokamak plasmas with a short pulse NB injection is performed. The time trend of S-n is successfully reproduced by FBURN.
关键词	neutron emission rate deuterium plasma LHD KSTAR EAST
DOI	10.1088/1361-6587/aad4b7
关键词[WOS]	TRITON BURNUP ; DIII-D ; CONFINEMENT ; DIAGNOSTICS ; INJECTION ; DEVICE ; JT-60U ; IONS ; LHD
收录类别	SCI
语种	英语
资助项目	LHD project budgets[ULHH003] ; LHD project budgets[ULHH034] ; Japan-Korea Fusion Collaborations ; Japan-China Collaboration for Fusion Research (Post-CUP Collaboration) ; MEXT of Japan ; MOST of China ; LHD project budgets[ULHH003] ; LHD project budgets[ULHH034] ; Japan-Korea Fusion Collaborations ; Japan-China Collaboration for Fusion Research (Post-CUP Collaboration) ; MEXT of Japan ; MOST of China
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WOS研究方向	Physics
WOS类目	Physics, Fluids & Plasmas
WOS记录号	WOS:000441189800001
出版者	IOP PUBLISHING LTD
引用统计	被引频次：14[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.hfcas.ac.cn:8080/handle/334002/37706
专题	中科院等离子体物理研究所
通讯作者	Ogawa, Kunihiro
作者单位	1.Natl Inst Nat Sci, Natl Inst Fus Sci, Toki, Gifu, Japan 2.SOKENDAI Grad Univ Adv Studies, Toki, Gifu, Japan 3.Kyoto Univ, Kyoto, Japan 4.Seoul Natl Univ, Seoul, South Korea 5.Natl Fus Res Inst, Daejeon, South Korea 6.Chinese Acad Sci, Inst Plasma Phys, Hefei, Anhui, Peoples R China
推荐引用方式 GB/T 7714	Ogawa, Kunihiro,Isobe, Mitsutaka,Nishitani, Takeo,et al. Time dependent neutron emission rate analysis for neutral-beam-heated deuterium plasmas in a helical system and tokamaks[J]. PLASMA PHYSICS AND CONTROLLED FUSION,2018,60(9):8.
APA	Ogawa, Kunihiro.,Isobe, Mitsutaka.,Nishitani, Takeo.,Seki, Ryosuke.,Nuga, Hideo.,...&Hu, Liqun.(2018).Time dependent neutron emission rate analysis for neutral-beam-heated deuterium plasmas in a helical system and tokamaks.PLASMA PHYSICS AND CONTROLLED FUSION,60(9),8.
MLA	Ogawa, Kunihiro,et al."Time dependent neutron emission rate analysis for neutral-beam-heated deuterium plasmas in a helical system and tokamaks".PLASMA PHYSICS AND CONTROLLED FUSION 60.9(2018):8.