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 PI01: Magnetic Confinement Fusion V
2:00 PM–5:00 PM,
Wednesday, October 19, 2022
Room: Ballroom 100 A
Chair: Kathreen Thome, GA
Abstract: PI01.00005 : The physics of plasma detachment in the novel MAST-Upgrade Super-X divertor*
4:00 PM–4:30 PM
Presenter:
Kevin Verhaegh
(United Kingdom Atomic Energy Agency)
Authors:
Kevin Verhaegh
(United Kingdom Atomic Energy Agency)
Bruce Lipschultz
(University of York)
James R Harrison
(United Kingdom Atomic Energy Agency)
Nick Osborne
(University of Liverpool)
Aelwyn C Williams
(University of York)
Peter Ryan
(United Kingdom Atomic Energy Agency)
Joseph Allcock
(United Kingdom Atomic Energy Agency)
James Clark
(University of Liverpool)
Fabio Federici
(University of York)
Bob Kool
(Dutch Institute For Fundamental Energy Research)
Tijs A Wijkamp
(Eindhoven University of Technology)
David Moulton
(United Kingdom Atomic Energy Agency)
Omkar Myatra
(United Kingdom Atomic Energy Agency)
Christopher Bowman
(United Kingdom Atomic Energy Agency)
Andrew J Thornton
(United Kingdom Atomic Energy Agency)
Lingyang Xiang
(United Kingdom Atomic Energy Agency)
Jack Lovell
(Oak Ridge National Laboratory)
Thomas van den Biggelaar
(University of Eindhoven)
Collaboration:
MAST Upgrade
During detachment, first the ionisation source detaches from the target, leaving behind a region with elevated molecular densities. In that region, molecular ions are formed that interact with the plasma, resulting in strong hydrogen emission, ion sinks through molecular activated recombination (MAR) and neutral atom sources from molecular activated dissociation. The MAR Ion sinks are significant compared to the ion source and ion target flux and occur earlier in the detachment sequence than electron-ion recombination (EIR). EIR only has a similar magnitude to MAR when target electron temperatures of < 0.3 eV are reached.
Comparison of our experimental results against SOLPS-ITER modelling indicates that plasma-molecular interactions are strongly underestimated in modelling. However, once corrected rates for molecular charge exchange were implemented in Eirene, plasma-molecular interactions are stronger, resulting in a greatly improved agreement between experiment and simulation.
*Funding received from: the EUROfusion Consortium, funded by the European Union via the Euratom Research and Training Programme (Grant Agreement No 101052200 — EUROfusion); the RCUK Energy Programme and EPSRC Grants EP/T012250/1 and EP/N023846/1.
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