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

Zweben, S. J.; Stotler, D. P.; Scotti, F.; Myra, J. R.

doi:10.1063/1.5002695

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

Journal Article · Tue Sep 26 00:00:00 EDT 2017 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5002695· OSTI ID:1394963

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^[1]; Scotti, F. ^[2];

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Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Lodestar Research Corporation, Boulder, CO (United States)

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 ε and tilt angle φ 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 ε = 2.2 ± 0.9, φ = 87° ± 34° (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. In conclusion, 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.

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Research Organization:: Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC02-09CH11466; FG02-02ER54678; AC52-07NA27344

OSTI ID:: 1394963

Alternate ID(s):: OSTI ID: 1394861; OSTI ID: 1883026

Report Number(s):: LLNL-JRNL-839009

Journal Information:: Physics of Plasmas, Vol. 24, Issue 10; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 19 works

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Experimental investigation of the tilt angle of turbulent structures in the core of fusion plasmas Pinzón, J. R.; Happel, T.; Hennequin, P. Nuclear Fusion, Vol. 59, Issue 7 https://doi.org/10.1088/1741-4326/ab227e	journal	June 2019
Disconnection of scrape off layer turbulence between the outer midplane and divertor target plate in NSTX Scotti, F.; Zweben, S.; Myra, J. Nuclear Fusion, Vol. 60, Issue 2 https://doi.org/10.1088/1741-4326/ab5886	journal	December 2019

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