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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.
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):
Journal ID: ISSN 0741-3335
Grant/Contract Number:
AC02-09CH11466; FG02-02ER54678
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:; Journal ID: ISSN 0741-3335
IOP Science
Research Org:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org:
Contributing Orgs:
The NSTX-U Team
Country of Publication:
United States
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; scrape-off layer (SOL); tokamaks; NSTX; turbulence
OSTI Identifier: