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Title: MHD-blob correlations in NSTX

Abstract

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.

Authors:
; ; ; ;
Publication Date:
DOE Contract Number:  
AC02 09CH11466; FG02-97ER54392; AC52-07NA27344
Product Type:
Dataset
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE
Keywords:
blobs; MHD; NSTX
OSTI Identifier:
1661167
DOI:
https://doi.org/10.11578/1661167

Citation Formats

SJ, Zweben, ED, Fredrickson, Myra, JR, M, Podesta, and F, Scotti. MHD-blob correlations in NSTX. United States: N. p., 2020. Web. doi:10.11578/1661167.
SJ, Zweben, ED, Fredrickson, Myra, JR, M, Podesta, & F, Scotti. MHD-blob correlations in NSTX. United States. doi:https://doi.org/10.11578/1661167
SJ, Zweben, ED, Fredrickson, Myra, JR, M, Podesta, and F, Scotti. 2020. "MHD-blob correlations in NSTX". United States. doi:https://doi.org/10.11578/1661167. https://www.osti.gov/servlets/purl/1661167. Pub date:Wed Jul 08 00:00:00 EDT 2020
@article{osti_1661167,
title = {MHD-blob correlations in NSTX},
author = {SJ, Zweben and ED, Fredrickson and Myra, JR and M, Podesta and F, Scotti},
abstractNote = {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.},
doi = {10.11578/1661167},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2020},
month = {7}
}