Carbon impurities behavior and its impact on ion thermal confinement in high-ion-temperature deuterium discharges on the Large Helical Device

被引：12

作者：

Mukai, K. ^{[1
,2
]}

Nagaoka, K. ^{[1
,3
]}

Takahashi, H. ^{[1
,2
]}

Yokoyama, M. ^{[1
,2
]}

Murakami, S. ^{[4
]}

Nakano, H. ^{[1
,2
]}

Ida, K. ^{[1
,2
]}

Yoshinuma, M. ^{[1
,2
]}

Seki, R. ^{[1
,2
]}

Kamio, S. ^{[1
]}

Fujiwara, Y. ^{[1
]}

Oishi, T. ^{[1
,2
]}

Goto, M. ^{[1
,2
]}

Morita, S. ^{[1
,2
]}

Morisaki, T. ^{[1
,2
]}

Osakabe, M. ^{[1
,2
]}

机构：

[1] Natl Inst Fus Sci, Natl Inst Nat Sci, Toki, Gifu 5095292, Japan

[2] SOKENDAI Grad Univ Adv Studies, Toki, Gifu 5095292, Japan

[3] Nagoya Univ, Grad Sch Sci, Nagoya, Aichi 4648601, Japan

[4] Kyoto Univ, Dept Nucl Engn, Kyoto, Kyoto 6158510, Japan

来源：

PLASMA PHYSICS AND CONTROLLED FUSION | 2018年 / 60卷 / 07期

关键词：

carbon impurity; ion thermal transport; particle transport; confinement improvement; LHD; isotope effect; deuterium plasma; RADIATIVELY IMPROVED MODE; TEXTOR-94; TOKAMAK;

D O I：

10.1088/1361-6587/aac06c

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

The behavior of carbon impurities in deuterium plasmas and its impact on thermal confinement were investigated in comparison with hydrogen plasmas in the Large Helical Device (LHD). Deuterium plasma experiments have been started in the LHD and high-ion-temperature plasmas with central ion temperature (T-i) of 10keV were successfully obtained. The thermal confinement improvement could be sustained for a longer time compared with hydrogen plasmas. An isotope effect was observed in the time evolution of the carbon density profiles. A transiently peaked profile was observed in the deuterium plasmas due to the smaller carbon convection velocity and diffusivity in the deuterium plasmas compared with the hydrogen plasmas. The peaked carbon density profile was strongly correlated to the ion thermal confinement improvement. The peaking of the carbon density profile will be one of the clues to clarify the unexplained mechanisms for the formations of ion internal transport barrier and impurity hole on LHD. These results could also lead to a better understanding of the isotope effect in the thermal confinement in torus plasma.

引用

页数：7

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