Blob wakes in NSTX

Zweben, S. J. ; Myra, J. R. ; Diallo, A. ; Russell, D. A. ; Scotti, F. ; Stotler, D. P.
Issue date: 2019
Rights:
 Creative Commons Attribution 4.0 International (CC BY)
Cite as:
Zweben, S. J., Myra, J. R., Diallo, A., Russell, D. A., Scotti, F., & Stotler, D. P. (2019). Blob wakes in NSTX [Data set]. Princeton Plasma Physics Laboratory, Princeton University. https://doi.org/10.11578/1562095
@electronic{zweben_s_j_2019,
  author      = {Zweben, S. J. and
                Myra, J. R. and
                Diallo, A. and
                Russell, D. A. and
                Scotti, F. and
                Stotler, D. P.},
  title       = {{Blob wakes in NSTX}},
  publisher   = {{Princeton Plasma Physics Laboratory, Pri
                nceton University}},
  year        = 2019,
  url         = {https://doi.org/10.11578/1562095}
}
Description:

Transient small-scale structures were identified in the wake of blobs moving poloidally through the SOL of high-powered H-mode plasmas in NSTX, using the gas puff imaging (GPI) diagnostic. These blob wakes had a poloidal wavelength in the range 3.5 cm, which is significantly smaller than the average blob scale of~12 cm, and the wakes had a poloidal velocity of 1.5 km/sec in the electron diamagnetic direction, which is opposite to the blob poloidal velocity in these shots. These wakes were radially localized 0-4 cm outside the separatrix and occurred within ~50 microsec after the passage of a blob through the GPI field of view. The clearest wakes were seen when the GPI viewing angle was well aligned with the local B field line, as expected for such small-scale structures given the diagnostic geometry. A plausible theoretical interpretation of the wakes is discussed: the observed wakes share some features of drift waves and/or drift-Alfven waves which could be excited by the blobs.

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More about this record
Authors Zweben, S. J. (Princeton Plasma Physics Laboratory)
Myra, J. R.
Diallo, A. (Princeton Plasma Physics Laboratory)
Russell, D. A.
Scotti, F.
Stotler, D. P. (Princeton Plasma Physics Laboratory)
Domains Natural Sciences
Communities Princeton Plasma Physics Laboratory
Subcommunities NSTX-U, Spherical Torus, Tokamak Experimental Sciences
Issue date 2019
URI https://doi.org/10.11578/1562095
URI http://arks.princeton.edu/ark:/88435/dsp01vm40xv421
Publisher Princeton Plasma Physics Laboratory, Princeton University
Type Dataset
Funders United States Department of Energy, DE-AC02-09CH11466
United States Department of Energy, DE-AC52-07NA27344
Office of Fusion Energy Sciences, DE-FG02-02ER54678
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