Edge transport and turbulence reduction with lithium coated plasma facing components in the National Spherical Torus Experiment

被引：61

作者：

Canik, J. M. ^{[1
]}

Maingi, R. ^{[1
]}

Kubota, S. ^{[2
]}

Ren, Y. ^{[3
]}

Bell, R. E. ^{[3
]}

Callen, J. D. ^{[4
]}

Guttenfelder, W. ^{[3
]}

Kugel, H. W. ^{[3
]}

LeBlanc, B. P. ^{[3
]}

Osborne, T. H. ^{[5
]}

Soukhanovskii, V. A. ^{[6
]}

机构：

[1] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

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

[3] Princeton Plasma Phys Lab, Princeton, NJ 08543 USA

[4] Univ Wisconsin, Madison, WI 53706 USA

[5] Gen Atom Co, San Diego, CA 92186 USA

[6] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA

来源：

PHYSICS OF PLASMAS | 2011年 / 18卷 / 05期

关键词：

DIII-D; CONFINEMENT; PHYSICS; PERFORMANCE; SHEAR; ITER;

D O I：

10.1063/1.3592519

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 coating of plasma facing components (PFCs) with lithium improves energy confinement and eliminates ELMs in the National Spherical Torus Experiment, the latter due to a relaxation of the density and pressure profiles that reduces the drive for peeling-ballooning modes. 2-D interpretive transport modeling of discharges without and with lithium shows that a reduction in the PFC recycling coefficient from R similar to 0.98 to R similar to 0.90 is required to match the drop in D-alpha emission with lithium coatings. A broadening of the edge barrier region showing reduced transport coefficients is observed, with a similar to 75% drop of the D and chi(e) from 0.8 < psi(N) < 0.93 needed to match the profile relaxation with lithium coatings. Turbulence measurements using an edge reflectometry system as well as high-k microwave scattering show a decrease in density fluctuations with lithium coatings. These transport changes allow the realization of very wide pedestals, with a similar to 100% width increase relative to the reference discharges. (C) 2011 American Institute of Physics. [doi:10.1063/1.3592519]

引用

页数：12

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