Scaling of the power exhaust channel in Alcator C-Mod

被引：69

作者：

LaBombard, B. ^{[1
]}

Terry, J. L. ^{[1
]}

Hughes, J. W. ^{[1
]}

Brunner, D. ^{[1
]}

Payne, J. ^{[1
]}

Reinke, M. L. ^{[1
]}

Cziegler, I. ^{[1
]}

Granetz, R. ^{[1
]}

Greenwald, M. ^{[1
]}

Hutchinson, I. H. ^{[1
]}

Irby, J. ^{[1
]}

Lin, Y. ^{[1
]}

Lipschultz, B. ^{[1
]}

Ma, Y. ^{[1
]}

Marmar, E. S. ^{[1
]}

Rowan, W. L. ^{[2
]}

Tsujii, N. ^{[1
]}

Wallace, G. ^{[1
]}

Whyte, D. G. ^{[1
]}

Wolfe, S. ^{[1
]}

Wukitch, S. ^{[1
]}

Wurden, G. ^{[3
]}

机构：

[1] MIT, Plasma Sci & Fus Ctr, Cambridge, MA 02139 USA

[2] Univ Texas Austin, Fus Res Ctr, Austin, TX 78712 USA

[3] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

来源：

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

关键词：

SCRAPE-OFF-LAYER; TOKAMAK EDGE TURBULENCE; TRANSPORT PHENOMENA; DIVERTOR-PHYSICS; HEAT-FLUX; SEPARATRIX;

D O I：

10.1063/1.3566059

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：

Parametric dependences of the heat flux footprint on the outer divertor target plate are explored in EDA H-mode and ohmic L-mode plasmas over a wide range of parameters with attached plasma conditions. Heat flux profile shapes are found to be independent of toroidal field strength, independent of power flow along magnetic field lines and insensitive to x-point topology (single-null versus double-null). The magnitudes and widths closely follow that of the "upstream" pressure profile, which are correlated to plasma thermal energy content and plasma current. Heat flux decay lengths near the strike-point in H-and L-mode plasmas scale approximately with the inverse of plasma current, with a diminished dependence at high collisionality in L-mode. Consistent with previous studies, pressure gradients in the boundary scale with plasma current squared, holding the magnetohydrodynamic ballooning parameter approximately invariant at fixed collisionality-strong evidence that critical-gradient transport physics plays a key role in setting the power exhaust channel. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3566059]

引用

页数：14

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