Bulletin of the American Physical Society
66th Annual Meeting of the APS Division of Plasma Physics
Monday–Friday, October 7–11, 2024; Atlanta, Georgia
Session BO05: MFE:Low Aspect Ratio Tokamaks
9:30 AM–12:30 PM,
Monday, October 7, 2024
Hyatt Regency
Room: Hanover C
Chair: James Yang, Princeton Plasma Physics Laboratory (PPPL)
Abstract: BO05.00007 : Global power balance on MAST Upgrade.*
10:54 AM–11:06 AM
Presenter:
Jack J Lovell
(Oak Ridge National Laboratory)
Authors:
Jack J Lovell
(Oak Ridge National Laboratory)
Andrew Kirk
(UKAEA)
Jessica M Stobbs
(UKAEA)
Fabio Federici
(Oak Ridge National Laboratory)
Peter Ryan
(UK Atomic Energy Authority (UKAEA))
Stuart Henderson
(United Kingdom Atomic Energy Authority)
James R Harrison
(UK Atomic Energy Authority (UKAEA))
Bartosz Lomanowski
(Oak Ridge National Laboratory)
Jeremy Lore
(Oak Ridge National Laboratory)
Collaboration:
The MAST Upgrade Team
Analysis of H mode plasmas with either conventional or Super-X divertors, heated with 3.5 MW of on- and off-axis netural beam injection (NBI), found a >30% power deficit in both single null and double null independent of divertor configuration [1]. Extending this analysis to L mode plasmas heated with a single NBI <1.5 MW, preliminary analysis has found that the 30% power deficit remains when off-axis NBI alone is used but the power deficit is significantly reduced to <10% when on-axis NBI alone is used.
These findings suggest that the coupling of auxiliary heating to the plasma plays a dominant role in the overall power balance. Accurate quantification of this coupling is important to constrain the upstream power entering the scrape-off layer.
[1] Lovell et al. PSI 2024
*This work was supported by the US Department of Energy under award DE-AC05-00OR22725 and by the EPSRC Energy Programme grant EP/W006839/1.
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