Bulletin of the American Physical Society
64th Annual Meeting of the APS Division of Plasma Physics
Volume 67, Number 15
Monday–Friday, October 17–21, 2022; Spokane, Washington
Session JO05: Edge and Pedestal Physics
2:00 PM–5:00 PM,
Tuesday, October 18, 2022
Room: Ballroom 111 B
Chair: Roberto Maurizio, Oak Ridge Associated Universities / General Atomics
Abstract: JO05.00012 : Impact of the separatrix plasma on core L mode performances in the WEST full W environment
4:24 PM–4:36 PM
Presenter:
Clarisse Bourdelle
(CEA)
Authors:
Clarisse Bourdelle
(CEA)
Jorge Morales
(CEA)
Jean-François Artaud
(CEA)
Tenessee Radenac
(CEA)
Ondrej Grover
(IPP)
Collaboration:
WEST
WEST data, natively in IMAS, automatically generated 804 D L mode plasma plateaus (stable power and Ip >0.3s) used for time averaging. The best core performances correlate with the lowest density at the separatrix, nsep, similarly to AUG and JET in H mode. Reflectometry in the midplane provides nsep while Tsep is inferred by the 2 point model using Langmuir Probe data on targets. nsep scales as Tsep1/2 hence the separatrix resistivity does not correlate with core performances.
As expected in presence of efficient neutral recycling fluxes, nsep does not correlate with the controlled line integrated density but rather with the D recycled particle flux at the divertor from visible spectroscopy. Coherently, lower nsep correlates with larger density gradient around the separatrix as well as larger global density peaking from interferometry. The later correlates as well with lower collisionality in the core, questioning the causality chain from SOL to core.
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