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

ID: 20904.0, MPI für Plasmaphysik / Articles, Books, Inbooks
Characteristics and scaling of energy and particle losses during Type I ELMs in JET H-modes
Authors:Loarte, A.; Becoulet, M.; Saibene, G.; Sartori, R.; Campbell, D. J.; Eich, T.; Herrmann, A.; Laux, M.; Suttrop, W.; Alper, B.; Lomas, P. J.; Matthews, G.; Jachmich, S.; Ongena, J.; Innocente, P.; EFDA-JET Work Programme Collaborators
Date of Publication (YYYY-MM-DD):2002-09
Title of Journal:Plasma Physics and Controlled Fusion
Journal Abbrev.:Plasma Phys. Control. Fusion
Issue / Number:9
Start Page:1815
End Page:1844
Review Status:Peer-review
Audience:Experts Only
Abstract / Description: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.
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Plasmaphysik/E1
External Affiliations:EFDA 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
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