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  Characteristics and scaling of energy and particle losses during Type I ELMs in JET H-modes

Loarte, A., Becoulet, M., Saibene, G., Sartori, R., Campbell, D. J., Eich, T., et al. (2002). Characteristics and scaling of energy and particle losses during Type I ELMs in JET H-modes. Plasma Physics and Controlled Fusion, 44(9), 1815-1844.

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Loarte, A.1, Autor
Becoulet, M.1, Autor
Saibene, G.1, Autor
Sartori, R.1, Autor
Campbell, D. J.1, Autor
Eich, T.2, Autor           
Herrmann, A.2, Autor           
Laux, M.3, 4, Autor           
Suttrop, W.5, Autor           
Alper, B.1, Autor
Lomas, P. J.1, Autor
Matthews, G.1, Autor
Jachmich, S.1, Autor
Ongena, J.1, Autor
Innocente, P.1, Autor
EFDA-JET Work Programme Collaborators1, Autor
Affiliations:
1EFDA CSU, D-85748 Garching,; Germany; CEA Cadarache, EURATOM Assoc, DRFC, F-13108 St Paul Les Durance, France; UKAEA Euratom Fus Assoc, Abingdon OX14 3DB, Oxon, England; EURATOM, ERM KMS LPP, B-1000 Brussels, Belgium; EURATOM, Consorzio RFX, CNR, I-35127 Padua, Italy, ou_persistent22              
2Experimental Plasma Physics 1 (E1), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856295              
3Plasma Diagnostics Group (HUB), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856324              
4W7-X: Physics (PH), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856305              
5Experimental Plasma Physics 2 (E2), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856292              

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 Zusammenfassung: Recent experiments on the Type I ELMy H-mode regime performed at JET with improved diagnostics have expanded the range of parameters for the study of Type I ELM energy and particle losses. Deviations from the standard behaviour of such losses in some areas of the Type I ELMy H-mode operating space have revealed that the ELM losses are correlated with the parameters (density and temperature) of the pedestal plasma before the ELM crash, while other global ELM characteristics (such as ELM frequency) are a consequence of the ELM-driven energy and particle flux and of the in-between ELM energy and particle confinement. The relative Type I ELM plasma energy loss (to the pedestal energy) is found to correlate well with the collisionality of the pedestal plasma, showing a weak dependence on the method used to achieve those pedestal plasma parameters: plasma shaping, heating, pellet injection and impurity seeding. Effects of edge plasma collisionality and transport along the magnetic field,on the Type I ELM particle and energy fluxes onto the divertor target have also been observed. Two possible physical mechanisms that may give rise to the observed collisionality dependence of ELM energy losses are proposed and their consistency with the experimental measurements investigated: collisionality dependence of the edge bootstrap current with its associated influence on the ELM MHD origin and the limitation of the ELM energy loss by the impedance of the divertor target sheath to energy flow during the ELM event.

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Sprache(n): eng - English
 Datum: 2002-09
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: eDoc: 20904
ISI: 000178415900004
 Art des Abschluß: -

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Titel: Plasma Physics and Controlled Fusion
  Alternativer Titel : Plasma Phys. Control. Fusion
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: -
Seiten: - Band / Heft: 44 (9) Artikelnummer: - Start- / Endseite: 1815 - 1844 Identifikator: ISSN: 0741-3335