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 NO05: Particle and Power Handling, Divertor Physics, and Plasma-Material Interactions
9:30 AM–12:30 PM,
Wednesday, October 19, 2022
Room: Ballroom 111 B
Chair: Michele Romanelli, Tokamak Energy Ltd
Abstract: NO05.00015 : Assessment of light impurity content at the WEST divertor during L-mode discharges based on an integrated multi-diagnostic workflow.*
12:18 PM–12:30 PM
Presenter:
Alex GROSJEAN
(Department of Nuclear Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA)
Authors:
Alex GROSJEAN
(Department of Nuclear Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA)
David C Donovan
(Department of Nuclear Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA)
Sean R Kosslow
(University of Tennessee)
Curtis Johnson
(Oak Ridge National Laboratory, Oak Ridge, TN 37831-6169, United States of America)
Jake B Maeker
(Department of Nuclear Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA)
Nicolas Fedorczak
(CEA, Institute for Research on Fusion by Magnetic confinement, 13108 St-Paul-Lez-Durance, France)
James P Gunn
(CEA, Institute for Research on Fusion by Magnetic confinement, 13108 St-Paul-Lez-Durance, France)
Christophe Guillemaut
(CEA, Institute for Research on Fusion by Magnetic confinement, 13108 St-Paul-Lez-Durance, France)
C.Christopher Klepper
(ORNL)
E.A. Unterberg
(Oak Ridge National Laboratory)
Jacob H Nichols
(Oak Ridge National Lab)
Collaboration:
WEST team
This work details how the integrated multi-diagnostic workflow [Grosjean, IEEE TPS, 2022] is used to refine the low-Z impurity content near the divertor target using visible spectroscopy. The content of all impurity charge states is inferred with the use of a collisional-radiative model “ColRadPy”. The work is performed on a dedicated session of W source characterization performed in L-mode in WEST. A power scan was performed in a standard WEST magnetic equilibrium with lower hybrid (LH) injected power up to 4.5 MW. First results show that O, commonly used as the main light impurity proxy in WEST impurity transport modeling may not be the main W sputtering contributor: ~10 % for O and ~35% for C [Grosjean, NME, 2022]. This refined light impurity content is then used as a constraint for transport modeling (OEDGE code suite) to evaluate the impurity charge state distribution in the scrape-off layer (SOL). Synthetic data based on OEDGE modeling is then created using CHERAB and compared with visible spectroscopy to improve the refined impurity content.
*This work is supported by the U.S. DOE under Grant Number DE-SC0020414.
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