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



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ID: 56319.0, MPI für Plasmaphysik / Articles, Books, Inbooks
JET carbon screening experiments using methane gas puffing and its relation to intrinsic carbon impurities
Authors:Strachan, J. D.; Fundamenski, W.; Charlet, M.; Corrigan, G.; Erents, K.; Gafert, J.; Giroud, C.; Gowers, C.; von Hellermann, M.; Horton, L. D.; Matthews, G. F.; McCracken, G.; Philipps, V.; Spence, J.; Stamp, M. F.; Zastrow, K.-D.; EFDA-JET Work Programme Collaborators
Language:English
Date of Publication (YYYY-MM-DD):2003
Title of Journal:Nuclear Fusion
Journal Abbrev.:Nucl. Fusion
Volume:43
Issue / Number:9
Start Page:922
End Page:941
Copyright:Copyright © Institute of Physics and IOP Publishing Limited 2003
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:JET carbon screening experiments were performed using methane gas injection. L-Mode experiments scanned parameters influencing the JET scrape-off-layer (SOL) and/or intrinsic impurity level. Scaling relations are derived to describe methane injected into L-Mode plasmas from the JET horizontal mid-plane. L-Mode screening was 3–20 times better for plasmas connected to the divertor than for similar limited plasmas. The screening was worse for methane injection from the mid-plane and best for injection from the divertor. The screening was 1.5–2 times worse for H-Mode than L-Mode. Both ELM-averaged and inter-ELM H-Mode screening was documented. The screening results were used to understand the intrinsic impurity levels. Zeff reduced at higher densities partly due to better carbon screening at the higher density, and partly due to decreased carbon influxes. Diverted L-Mode intrinsic carbon levels arose from both main chamber and divertor sources, while H-mode carbon primarily originated from the divertor. DIVIMP and EDGE2D were used to model the observed screening. The modelling indicated that carbon removal to the divertor required lower temperatures for Coulomb collisions to couple the impurity ions to the SOL deuterium flows. The carbon removal occurred primarily in the outer SOL regions.
Free Keywords:SCRAPE-OFF LAYER, ONION-SKIN MODEL, VARIED GEOMETRY, H-MODES, DIVERTOR, TOKAMAK, PLASMAS, CODE, BEHAVIOR, LIMITER
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Plasmaphysik/E4
External Affiliations:PPPL, Princeton University, USA; UKAEA, Culham, UK; CEA, Cadarache, France; FOM, Netherlands; KFA, Juelich, Germany
Identifiers:DOI:10.1088/0029-5515/43/9/317
URL:http://stacks.iop.org/0029-5515/43/922
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