Achievement of Reactor-Relevant Performance in Negative Triangularity Shape in the DIII-D Tokamak

被引：148

作者：

Austin, M. E. ^{[1
]}

Marinoni, A. ^{[2
]}

Walker, M. L. ^{[3
]}

Brookman, M. W. ^{[3
]}

deGrassie, J. S. ^{[3
]}

Hyatt, A. W. ^{[3
]}

McKee, G. R. ^{[4
]}

Petty, C. C. ^{[3
]}

Rhodes, T. L. ^{[5
]}

Smith, S. P. ^{[3
]}

Sung, C. ^{[6
]}

Thome, K. E. ^{[3
]}

Turnbull, A. D. ^{[3
]}

机构：

[1] Univ Texas Austin, Austin, TX 78712 USA

[2] MIT, Plasma Sci & Fus Ctr, 77 Massachusetts Ave, Cambridge, MA 02139 USA

[3] Gen Atom, San Diego, CA 92186 USA

[4] Univ Wisconsin, Madison, WI 53706 USA

[5] Univ Calif Los Angeles, Los Angeles, CA 90095 USA

[6] Lam Res Corp, Fremont, CA 94538 USA

来源：

PHYSICAL REVIEW LETTERS | 2019年 / 122卷 / 11期

关键词：

PLASMAS; LIMITS;

D O I：

10.1103/PhysRevLett.122.115001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Plasma discharges with a negative triangularity (delta = -0.4) shape have been created in the DIII-D tokamak with a significant normalized beta (beta(N) = 2.7) and confinement characteristic of the high confinement mode (H-98y2 = 1.2) despite the absence of an edge pressure pedestal and no edge localized modes (ELMs). These inner-wall-limited plasmas have a similar global performance as a positive triangularity (delta = +0.4) ELMing H-mode discharge with the same plasma current, elongation and cross sectional area. For cases both of dominant electron cyclotron heating with T-e/T-i > 1 and dominant neutral beam injection heating with T-e/T-i = 1, turbulent fluctuations over radii 0.5 < rho < 0.9 were reduced by 10-50% in the negative triangularity shape compared to the matching positive triangularity shape, depending on the radius and conditions.

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页数：5

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