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Mean and Oscillating Plasma Flows and Turbulence Interactions across the L-H Confinement Transition.
MedLine Citation:
PMID:  21405471     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
A complex interaction between turbulence driven E×B zonal flow oscillations, i.e., geodesic acoustic modes (GAMs), the turbulence, and mean equilibrium flows is observed during the low to high (L-H) plasma confinement mode transition in the ASDEX Upgrade tokamak. Below the L-H threshold at low densities a limit-cycle oscillation forms with competition between the turbulence level and the GAM flow shearing. At higher densities the cycle is diminished, while in the H mode the cycle duration becomes too short to sustain the GAM, which is replaced by large amplitude broadband flow perturbations. Initially GAM amplitude increases as the H-mode transition is approached, but is then suppressed in the H mode by enhanced mean flow shear.
Authors:
G D Conway; C Angioni; F Ryter; P Sauter; J Vicente;
Publication Detail:
Type:  Journal Article     Date:  2011-02-08
Journal Detail:
Title:  Physical review letters     Volume:  106     ISSN:  1079-7114     ISO Abbreviation:  Phys. Rev. Lett.     Publication Date:  2011 Feb 
Date Detail:
Created Date:  2011-03-16     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0401141     Medline TA:  Phys Rev Lett     Country:  United States    
Other Details:
Languages:  eng     Pagination:  065001     Citation Subset:  IM    
Affiliation:
EURATOM-Association IPP, Max-Plank-Institut für Plasmaphysik, D-85748, Garching, Germany.
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