MHD-blob correlations in NSTX

Dataset · Wed Jul 08 00:00:00 EDT 2020

DOI:https://doi.org/10.11578/1661167· OSTI ID:1661167

SJ, Zweben; ED, Fredrickson; Myra, JR; M, Podesta; F, Scotti

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.

• Research Organization: Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02 09CH11466; FG02-97ER54392; AC52-07NA27344
• OSTI ID: 1661167
• Country of Publication: United States
• Language: English

Related Subjects

blobs
MHD
NSTX