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          Institute: MPI für Plasmaphysik     Collection: Articles, Books, Inbooks     Display Documents



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ID: 20899.0, MPI für Plasmaphysik / Articles, Books, Inbooks
Incomplete reconnection in sawtooth crashes in ASDEX Upgrade
Authors:Letsch, A.; Zohm, H.; Ryter, F.; Suttrop, W.; Gude, A.; Porcelli, F.; Angioni, C.; Furno, I.
Language:English
Date of Publication (YYYY-MM-DD):2002-09
Title of Journal:Nuclear Fusion
Journal Abbrev.:Nucl. Fusion
Volume:42
Issue / Number:9
Start Page:1055
End Page:1059
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:The temporal evolution of the sawtooth crash in ASDEX Upgrade Ohmic and ECRH heated discharges is analysed using a heuristic reconnection model to simulate measured ECE signals. The method turns out to be well suited to detect islands of width above 0.1-0.2 times the mixing radius; for smaller island widths, we cannot distinguish between the resistive and the ideal mode. Thus, the nature of the precursor oscillation cannot be fully resolved. In contrast, we find that during the crash phase, reconnection is incomplete and a large island persists that fully reconnects on a slower time-scale after the crash. The observations are consistent with a recent sawtooth model.
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Plasmaphysik/E2
External Affiliations:Inst Plasmaforsch, Pfaffenwaldring 31, D-70569 Stuttgart,; Germany; MIT, PSFC, Cambridge, MA 02139 USA; Politecn Turin, Ist Nazl Fis Mat, Dept Energet, I-10129 Turin, Italy; EPFL, CRPP, CH-1015 Lausanne, Switzerland
Identifiers:ISI:000178425500003
ISSN:0029-5515
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