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2021-06-29
AUTHORS ABSTRACTThis paper presents a model for zonal flows (ZFs) generation based on a Chew-Goldberger-Low double equations in the regime of finite banana width (FBW) length-scale creating polarization shielding. The coupled equation is used to investigate the interplay between marginally stable geodesic-acoustic modes (GAM) and low frequency zonal flow (LZF) branch. The effect of safety factor q and dimensionless parameter η=p⊥/p||\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\eta = {\text{p}}_{ \bot } /{\text{p}}_{{||}}$$\end{document} on the LZF as well as GAM is investigated. Furthermore, suppression of the growth rate due to polarization shielding is demonstrated. The mechanism of ZFs growth and suppression displays many of the features expected for avalanches in tokamak turbulence. More... »
PAGES17
http://scigraph.springernature.com/pub.10.1007/s10894-021-00307-3
DOIhttp://dx.doi.org/10.1007/s10894-021-00307-3
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