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Towards a general scaling of the Scrape-off Layer density width
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SYSNO ASEP 0474109 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Towards a general scaling of the Scrape-off Layer density width Author(s) Carralero, D. (DE)
Sun, H.J. (DE)
Artene, S.A. (DE)
Manz, P. (DE)
Müller, H.W. (DE)
Groth, M. (FI)
Komm, Michael (UFP-V) RID, ORCID
Adámek, Jiří (UFP-V) RID, ORCID
Aho-Mantila, L. (FI)
Birkenmeier, G. (DE)
Brix, M. (FI)
Stroth, U. (DE)
Vianello, N. (IT)
Viezzer, E. (DE)
Wischmeier, M. (DE)
Wolfrum, E. (DE)Article number O2.106 Source Title EPS 2015:42nd European Physical Society Conference on Plasma Physics, 39E. - Mulhouse : European Physical Society, 2015 - ISBN 2-914771-98-3 Number of pages 4 s. Publication form Online - E Action EPS 2015 Conference on Plasma Physics/42./ Event date 22.06.2015-26.06.2015 VEvent location Lisbon Country PT - Portugal Event type EUR Language eng - English Country PT - Portugal Keywords Scrape-off Layer ; ITER ; COMPASS ; tokamak Subject RIV BL - Plasma and Gas Discharge Physics OECD category Fluids and plasma physics (including surface physics) Institutional support UFP-V - RVO:61389021 EID SCOPUS 84979671282 Annotation The width of the Scrape-off Layer –defined here as the typical radial distance travelled by particles ejected at the separatrix before hitting some PFC- is a key feature for next generation tokamaks, as it will determine erosion levels and heat loads at many critical
plasma facing components, and most critically at the main chamber first wall. Recent Lmode experiments carried out on the ITER stepladder (including COMPASS, ASDEX Upgrade and JET tokamaks) [1] have proven the link between an increase in filament size
at the outer midplane and the onset of the density profile flattening known as “shoulder” [2-4]. This study indicates that the increased effective collisionality, Ldiv, [5,6] in the divertor region at the onset of detachment leads to a change in the regime of filamentary propagation, greatly enhancing radial particle and heat transport. This has been explained as the effect of filament disconnection from the wall: when collisionality along the field line increases over a certain value, the parallel term of the charge conservation equation becomes negligible and the filament goes from Sheath Limited (SL) regime [7] to Inertial (IN) regime [8]. In order to refine the findings in [1] and confirm the validity of this model, a series of dedicated experiments have been carried out in AUG.
Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2018
Number of the records: 1