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Title: Blob structure and motion in the edge and SOL of NSTX

Here, the structure and motion of discrete plasma blobs (a.k.a. filaments) in the edge and scrape-off layer of NSTX is studied for representative Ohmic and H-mode discharges. Individual blobs were tracked in the 2D radial versus poloidal plane using data from the gas puff imaging diagnostic taken at 400 000 frames s -1. A database of blob amplitude, size, ellipticity, tilt, and velocity was obtained for ~45 000 individual blobs. Empirical relationships between various properties are described, e.g. blob speed versus amplitude and blob tilt versus ellipticity. The blob velocities are also compared with analytic models.
Authors:
ORCiD logo [1] ;  [2] ; ORCiD logo [1] ;  [2] ;  [3] ;  [1] ;  [1] ;  [4] ;  [2] ; ORCiD logo [1]
  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  2. Lodestar Research Corp., Boulder, CO (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); X Science LLC, Plainsboro, NJ 08536, USA.
Publication Date:
Report Number(s):
PPPL-5194
Journal ID: ISSN 0741-3335
Grant/Contract Number:
AC02-09CH11466; FG02-02ER54678; AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Plasma Physics and Controlled Fusion
Additional Journal Information:
Journal Volume: 58; Journal Issue: 4; Related Information: The digital data for this paper can be found at: http://arks.princeton.edu/ark:/88435/dsp01vx021h49j; Journal ID: ISSN 0741-3335
Publisher:
IOP Science
Research Org:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Contributing Orgs:
The NSTX-U Team
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; scrape-off layer (SOL); tokamaks; NSTX; turbulence; tokamak; edge
OSTI Identifier:
1254654
Alternate Identifier(s):
OSTI ID: 1266861

Zweben, S. J., Myra, J. R., Davis, W. M., D’Ippolito, D. A., Gray, T. K., Kaye, S. M., LeBlanc, B. P., Maqueda, R. J., Russell, D. A., and Stotler, D. P.. Blob structure and motion in the edge and SOL of NSTX. United States: N. p., Web. doi:10.1088/0741-3335/58/4/044007.
Zweben, S. J., Myra, J. R., Davis, W. M., D’Ippolito, D. A., Gray, T. K., Kaye, S. M., LeBlanc, B. P., Maqueda, R. J., Russell, D. A., & Stotler, D. P.. Blob structure and motion in the edge and SOL of NSTX. United States. doi:10.1088/0741-3335/58/4/044007.
Zweben, S. J., Myra, J. R., Davis, W. M., D’Ippolito, D. A., Gray, T. K., Kaye, S. M., LeBlanc, B. P., Maqueda, R. J., Russell, D. A., and Stotler, D. P.. 2016. "Blob structure and motion in the edge and SOL of NSTX". United States. doi:10.1088/0741-3335/58/4/044007. https://www.osti.gov/servlets/purl/1254654.
@article{osti_1254654,
title = {Blob structure and motion in the edge and SOL of NSTX},
author = {Zweben, S. J. and Myra, J. R. and Davis, W. M. and D’Ippolito, D. A. and Gray, T. K. and Kaye, S. M. and LeBlanc, B. P. and Maqueda, R. J. and Russell, D. A. and Stotler, D. P.},
abstractNote = {Here, the structure and motion of discrete plasma blobs (a.k.a. filaments) in the edge and scrape-off layer of NSTX is studied for representative Ohmic and H-mode discharges. Individual blobs were tracked in the 2D radial versus poloidal plane using data from the gas puff imaging diagnostic taken at 400 000 frames s-1. A database of blob amplitude, size, ellipticity, tilt, and velocity was obtained for ~45 000 individual blobs. Empirical relationships between various properties are described, e.g. blob speed versus amplitude and blob tilt versus ellipticity. The blob velocities are also compared with analytic models.},
doi = {10.1088/0741-3335/58/4/044007},
journal = {Plasma Physics and Controlled Fusion},
number = 4,
volume = 58,
place = {United States},
year = {2016},
month = {1}
}