MHD-blob correlations in NSTX

Zweben SJ; Fredrickson ED; Myra JR; Podesta M; Scotti F
Issue date: May 2020
Cite as:
Zweben SJ, Fredrickson ED, Myra JR, Podesta M, & Scotti F. (2020). MHD-blob correlations in NSTX [Data set]. Princeton Plasma Physics Laboratory, Princeton University.
  author      = {Zweben SJ and
                Fredrickson ED and
                Myra JR and
                Podesta M and
                Scotti F},
  title       = {{MHD-blob correlations in NSTX}},
  publisher   = {{Princeton Plasma Physics Laboratory, Pri
                nceton University}},
  year        = 2020

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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