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 CP11: Poster Session II: In-Person, Hall A (2:00-3:30pm) and Virtual Poster Presentations (3:45-5:00pm)
MFE: Low Aspect Ratio; Superconducting
FUND: Nonneutral, Antimatter, Strong coupled Plasmas; Waves
2:00 PM - 5:00 PM
Monday, October 17, 2022
Room: Exhibit Hall A and Online
Abstract: CP11.00059 : Developing an iterative synthetic diagnosis workflow for light impurities on WEST*
Presenter:
Curtis A Johnson
(Oak Ridge National Laboratory)
Authors:
Curtis A Johnson
(Oak Ridge National Laboratory)
Ezekial A Unterberg
(Oak Ridge National Laboratory)
Chris Klepper
(Oak Ridge National Laboratory)
Yannick Marandet
(Aix-Marsielle University)
Madhusudan Raghunathan
(Aix-Marseille University)
Sean R Kosslow
(University of Tennessee)
Christophe Guillemaut
(CEA)
Nicolas Fedorczak
(CEA)
Alex GROSJEAN
(University of Tennessee, Knoxville)
David C Donovan
(University of Tennessee)
Collaboration:
WEST See http://west.cea.fr/WESTteam
An iterative synthetic diagnosis workflow is developed to infer impurity sources and transport through the main Scrape Off Layer (SOL) plasma. Often, fusion devices are limited in poloidal diagnostic coverage. However, full knowledge of impurity distributions over the poloidal extent is necessary to interpret experimental results. The workflow starts with a fixed background plasma to be used by a SOL impurity transport code to determine poloidal charge state abundances. The collisional radiative code ColRadPy is used to convert these abundances to spectral line intensities. Raysect is used to account for both 3D effects of sightlines and reflections off in-vessel components. Experimental measurements are compared with synthetic ones from this workflow, then used to iterate free parameters in the impurity transport code to spatially adjust the gridded charge state distribution and find consistency between the synthetic and experimental results. Both experimental and SOLEDGE SOL power scans were conducted on WEST focusing on oxygen, which is assumed to dominate W sputtering. A direct comparison of measured O II emission shows good agreement with the constructed synthetic workflow. The synthetic diagnosis workflow is used to inform future measurements of higher charge states.
**This work is supported by the U.S. DOE under Grant Numbers DE-SC0014664 & DE-AC05-00OR22725.
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