Non-neoclassical up/down asymmetry of impurity emission on Alcator C-Mod

被引：16
|
作者：
Reinke, M. L. [1 ]
Rice, J. E. [1 ]
Hutchinson, I. H. [1 ]
Greenwald, M. [1 ]
Howard, N. T. [1 ]
Hughes, J. W. [1 ]
Irby, J. [1 ]
Podpaly, Y. [1 ]
Terry, J. L. [1 ]
White, A. [1 ]
机构：
[1] MIT, Plasma Sci & Fus Ctr, Cambridge, MA 02139 USA
来源：
NUCLEAR FUSION | 2013年 / 53卷 / 04期
关键词：
POLOIDAL ASYMMETRIES; ZONAL FLOWS; SPECTRA; TOMOGRAPHY; PLASMA; ARGON; EDGE;
D O I：
10.1088/0029-5515/53/4/043006
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：
We demonstrate that existing theories are insufficient to explain up/down asymmetries of argon x-ray emission in Alcator C-Mod ohmic plasmas. Instead of the poloidal variation, (n) over tilde (z)/< n(z)>, being of order the inverse aspect ratio, is an element of, and scaling linearly with B-t(n) over bar (e)/I-p(2), it is observed over 0.8 < r/a < 1.0 to be of order unity and exhibits a threshold behaviour between 3.5 B-t<(n) over bar (e)/I-p < 4.0 (T10(20) m(-3) MA(-1)). The transition from a poloidally symmetric to asymmetric impurity distribution is shown to occur at densities just below those that trigger a reversal of the core toroidal rotation direction, thought to be linked to the transition between the linear and saturated ohmic confinement regimes. A possible drive is discussed by which anomalous radial transport might sustain the impurity density asymmetry as the ratio of the perpendicular to parallel equilibration times, tau(perpendicular to),(z)/tau(parallel to,z), approaches unity. This explanation requires a strong up/down asymmetry in radial flux which, while not observable on C-Mod, has been measured in TEXT and Tore Supra ohmic plasmas.
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页数：10
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