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High-confinement regime at high beta(N) values due to a changed behavior of the neoclassical tearing modes.
MedLine Citation:
PMID:  11800885     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
High confinement [with H = 1, ITERH- 98( y,2)] at beta(N) approximately 2.3 has been found in ASDEX Upgrade discharges with existing (m,n) = (3,2) neoclassical tearing modes (NTMs). The reason for the high confinement at high beta(N) values is a transition of the NTMs into the so-called frequently interrupted regime. In this regime, the NTM growth is frequently interrupted by sudden drops in amplitude. Because of the long NTM growth time, the resulting averaged NTM amplitude remains much smaller than the corresponding saturated value. As this behavior with the beneficial effect on energy confinement has been confirmed at JET, such a high confinement regime at beta(N)>2 might also be expected for ITER.
Authors:
S Günter; A Gude; M Maraschek; S Sesnic; H Zohm; D F Howell;
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Publication Detail:
Type:  Journal Article     Date:  2001-12-10
Journal Detail:
Title:  Physical review letters     Volume:  87     ISSN:  0031-9007     ISO Abbreviation:  Phys. Rev. Lett.     Publication Date:  2001 Dec 
Date Detail:
Created Date:  2002-01-21     Completed Date:  2002-03-01     Revised Date:  2003-10-31    
Medline Journal Info:
Nlm Unique ID:  0401141     Medline TA:  Phys Rev Lett     Country:  United States    
Other Details:
Languages:  eng     Pagination:  275001     Citation Subset:  -    
Affiliation:
Max-Planck-Institut für Plasmaphysik, EURATOM-Association, D-85748 Garching, Germany.
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