Two-dimensional turbulence cross-correlation functions in the edge of NSTX

被引：21
作者：
Zweben, S. J. [1 ]
Stotler, D. P. [1 ]
Scotti, F. [2 ]
Myra, J. R. [3 ]
机构：
[1] Princeton Plasma Phys Lab, Princeton, NJ 08540 USA
[2] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA
[3] Lodestar Res Corp, Boulder, CO 80301 USA
来源：
PHYSICS OF PLASMAS | 2017年 / 24卷 / 10期
关键词：
TRANSPORT;
D O I：
10.1063/1.5002695
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 2D radial vs. poloidal cross-correlation functions of edge plasma turbulence were measured near the outer midplane using a gas puff imaging (GPI) diagnostic on NSTX. These correlation functions were evaluated at radii r = 0 cm, +/- 3 cm, and +/- 6 cm from the separatrix and poloidal locations p = 0 cm and +/- 7.5 cm from the GPI poloidal center line for 20 different shots. The ellipticity epsilon and tilt angle phi of the positive cross-correlation regions and the minimum negative cross-correlation "cmin" and total negative over positive values "neg/pos" were evaluated for each of these cases. The average results over this dataset were epsilon = 2.2 +/- 0.9, phi = 87 degrees +/- 34 degrees (i.e., poloidally oriented), cmin = -0.30 +/- 0.15, and neg/pos = 0.25 +/- 0.24. Thus, there was a significant variation in these correlation results within this database, with dependences on the location within the image, the magnetic geometry, and the plasma parameters. Possible causes for this variation are discussed, including the misalignment of the GPI view with the local B field line, the magnetic shear of field lines at the edge, the poloidal flow shear of the turbulence, blob-hole correlations, and the neutral density 'shadowing' effect in GPI. Published by AIP Publishing.
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页数：22
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