TOROIDALLY ASYMMETRIC ELM PRECURSORS IN TCV

Citation
H. Reimerdes et al., TOROIDALLY ASYMMETRIC ELM PRECURSORS IN TCV, Nuclear fusion, 38(3), 1998, pp. 319-323
Citations number
8
Categorie Soggetti
Phsycs, Fluid & Plasmas","Physics, Nuclear
Journal title
ISSN journal
00295515
Volume
38
Issue
3
Year of publication
1998
Pages
319 - 323
Database
ISI
SICI code
0029-5515(1998)38:3<319:TAEPIT>2.0.ZU;2-T
Abstract
Coherent magnetic oscillations precede edge localized modes (ELMs) in TCV. The precursor has been detected prior to ELMs considered to be of type III and others previously referred to as TCV large: ELMs. This p ermits the identification of both as type III ELMs according to the us ual classification scheme. The strong localization of these precursors on the bad curvature side of the plasma and their medium toroidal mod e numbers indicate their ballooning character. Unlike conventional MHD modes, these modes start toroidally localized and grow in amplitude a nd toroidal extent. When the precursor encompasses the whole toroidal circumference, the increased transport phase, as indicated by the char acteristic D-alpha spike, begins.