Issue date: 2020
Creative Commons Attribution 4.0 International (CC BY)
Cite as:
Zweben, S. J., Fredrickson, E. D., Myra, J. R., Podesta, M., & Scotti, F. (2020). MHD-blob correlations in NSTX [Data set]. Princeton Plasma Physics Laboratory, Princeton University.
  author      = {Zweben, S. J. and
                Fredrickson, E. D. and
                Myra, J. R. and
                Podesta, M. and
                Scotti, F.},
  title       = {{MHD-blob correlations in NSTX}},
  publisher   = {{Princeton Plasma Physics Laboratory, Pri
                nceton University}},
  year        = 2020,
  url         = {}

This paper describes a study of the cross-correlations between edge fluctuations as seen in the gas puff imaging (GPI) diagnostic and low frequency coherent magnetic fluctuations (MHD) in H-mode plasmas in NSTX. The main new result was that large blobs in the SOL were significantly correlated with MHD activity the 3-6 kHz range in 21 of the 223 shots examined. There were also many other shots in which fluctuations in the GPI signal level and its peak radius Rpeak were correlated with MHD activity, but without any significant correlation of the MHD with large blobs. The structure and motion of the MHD is compared with that of the correlated blobs, and some possible theoretical mechanisms for the MHD-blob correlation are discussed.

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