High Speed Imaging of Edge Turbulence in NSTX

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The two-dimensional radial versus poloidal structure and motion of edge turbulence in NSTX (National Spherical Torus Experiment) were measured by using high-speed imaging of the visible light emission from a localized neutral gas puff. Edge turbulence images are shown and analyzed for Ohmic, L-mode (low-confinement mode) and H-mode (high-confinement mode) plasma conditions. Typical edge turbulence poloidal correlation lengths as measured using this technique are = 4 {+-} 1 cm and autocorrelation times are 40 {+-} 20 {micro}sec in all three regimes. The relative fluctuation level is typically smaller in H-mode than in L-mode, and transitions from H- to L-mode and ... continued below

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2.7 Megabytes pages

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Zweben, S. J.; Maqueda, R.; Stotler, D. P.; Keesee, A.; Boedo, J.; Bush, C. et al. March 2003.

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Description

The two-dimensional radial versus poloidal structure and motion of edge turbulence in NSTX (National Spherical Torus Experiment) were measured by using high-speed imaging of the visible light emission from a localized neutral gas puff. Edge turbulence images are shown and analyzed for Ohmic, L-mode (low-confinement mode) and H-mode (high-confinement mode) plasma conditions. Typical edge turbulence poloidal correlation lengths as measured using this technique are = 4 {+-} 1 cm and autocorrelation times are 40 {+-} 20 {micro}sec in all three regimes. The relative fluctuation level is typically smaller in H-mode than in L-mode, and transitions from H- to L-mode and can occur remarkably quickly (=30 {micro}sec). The two-dimensional images often show localized regions of strong light emission which move both poloidally and radially through the observed region at a typical speed of =10{sup 5} cm/sec, and sometimes show spatially coherent modes.

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2.7 Megabytes pages

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INIS; OSTI as DE00812921

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  • Other Information: PBD: 1 Mar 2003

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  • Report No.: PPPL-3795
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/812921 | External Link
  • Office of Scientific & Technical Information Report Number: 812921
  • Archival Resource Key: ark:/67531/metadc740889

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Office of Scientific & Technical Information Technical Reports

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  • March 2003

Added to The UNT Digital Library

  • Oct. 18, 2015, 6:40 p.m.

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  • June 30, 2016, 1:21 p.m.

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Zweben, S. J.; Maqueda, R.; Stotler, D. P.; Keesee, A.; Boedo, J.; Bush, C. et al. High Speed Imaging of Edge Turbulence in NSTX, report, March 2003; (digital.library.unt.edu/ark:/67531/metadc740889/: accessed November 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.