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  MHD stability analysis of type II ELMs in ASDEX Upgrade

Saarelma, S., Günter, S., Horton, L. D., & ASDEX Upgrade Team (2003). MHD stability analysis of type II ELMs in ASDEX Upgrade. Nuclear Fusion, 43(4), 262-267. doi:10.1088/0029-5515/43/4/307.

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Saarelma, S.1, Autor
Günter, S.2, Autor           
Horton, L. D.3, Autor           
ASDEX Upgrade Team4, Autor
Affiliations:
1Helsinki University of Technology, Euratom-TEKES Association, FIN-02015 HUT, Finland, ou_persistent22              
2Tokamak Theory (TOK), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856309              
3Experimental Plasma Physics 1 (E1), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856295              
4Max Planck Society, ou_persistent13              

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 Zusammenfassung: We investigated the differences between type I and type II edge localized modes (ELMs) in ASDEX Upgrade using the MHD stability analysis. When plasma conditions are changed from typical type I ELMy conditions to type II ELMy conditions, the character of the edge instabilities change. With increased triangularity and edge safety factor, the low-n peeling–ballooning mode becomes more stable and more localized to the edge region. We find the same mode localization effect in almost double null configuration. When the plasma density is increased, the access to the second stability of the high-n ballooning modes is closed. The changes in the stability properties give a qualitative explanation to the observed small amplitude of the type II ELMs.

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Sprache(n): eng - English
 Datum: 2003
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
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Titel: Nuclear Fusion
  Alternativer Titel : Nucl. Fusion
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Copyright © Institute of Physics and IOP Publishing Limited 2003
Seiten: - Band / Heft: 43 (4) Artikelnummer: - Start- / Endseite: 262 - 267 Identifikator: -