High-density plasma with internal diffusion barrier in the Large Helical Device

被引：26

作者：

Sakamoto, R. ^{[1
]}

Kobayashi, M. ^{[1
]}

Miyazawa, J. ^{[1
]}

Ohdachi, S. ^{[1
]}

Yamada, H. ^{[1
]}

Funaba, H. ^{[1
]}

Goto, M. ^{[1
]}

Masuzaki, S. ^{[1
]}

Morisaki, T. ^{[1
]}

Yamada, I. ^{[1
]}

Narihara, K. ^{[1
]}

Tanaka, K. ^{[1
]}

Morita, S. ^{[1
]}

Ida, K. ^{[1
]}

Sakakibara, S. ^{[1
]}

Narushima, Y. ^{[1
]}

Watanabe, K. Y. ^{[1
]}

Suzuki, Y. ^{[1
]}

Ashikawa, N. ^{[1
]}

Nagayama, Y. ^{[1
]}

Peterson, B. J. ^{[1
]}

Shoji, M. ^{[1
]}

Suzuki, C. ^{[1
]}

Tokitani, M. ^{[1
]}

Yoshimura, S. ^{[1
]}

Ohyabu, N. ^{[1
]}

Komori, A. ^{[1
]}

Motojima, O. ^{[1
]}

机构：

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

来源：

NUCLEAR FUSION | 2009年 / 49卷 / 08期

关键词：

ENERGY CONFINEMENT; PERFORMANCE; TOKAMAK; REGIMES; LHD;

D O I：

10.1088/0029-5515/49/8/085002

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：

An attractive high-density operational regime which is a so-called internal diffusion barrier (IDB) has been discovered in a helical divertor configuration on the Large Helical Device (LHD). The IDB is characterized by steep density gradients and the plasma profile is divided by the IDB into a high-density core plasma and a low density mantle plasma. The IDB enables the core plasma to access the high-density/high-pressure regime. The attainable central density exceeds 1 x 10(21) m(-3) and the central pressure reaches approximate to 1.5 times atmospheric pressure. Core pellet fuelling is absolutely essential for the IDB formation and it is reproducibly obtained by employing intensive multiple-pellet injection. In the IDB core plasma, the particle diffusion coefficient is kept at a considerably low level, 0.05 m(2) s(-1), in spite of high-density and steep-density gradients whereas an inward particle convection velocity is not observed.

引用

页数：8

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