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Simulations of edge localised mode instabilities in MAST-U Super-X tokamak plasmas.
- Source :
- Nuclear Fusion; Jun2020, Vol. 60 Issue 6, p1-19, 19p
- Publication Year :
- 2020
-
Abstract
- The high heat fluxes to the divertor during edge localised mode (ELM) instabilities have to be reduced for a sustainable future tokamak reactor. A solution to reduce the heat fluxes could be the Super-X divertor, which will be tested on MAST-U. ELM simulations for MAST-U Super-X tokamak plasmas have been obtained, using JOREK. A factor 10 decrease in the peak heat flux to the outer target and almost a factor 8 decrease in the ELM energy fluence when comparing the Super-X to a conventional divertor configuration has been found. A detached MAST-U case, after the roll-over in the target parallel electron density flux, is used as a starting point for ELM burn-through simulations. The plasma burns through the neutrals front during the ELM causing the divertor plasma to re-attach. After the crash a transition back to detachment is indicated, where the recovery to pre-ELM divertor conditions occurs in a few milliseconds, when the neutral pressure is high in the divertor. Recovery times are shorter than the inter-ELM phase in previous MAST experiments. The peak ELM energy fluence obtained after the ELM burn-through is 0.82 kJ/m<superscript>2</superscript>, which is significantly lower than that predicted from the empirical scaling of the ELM energy fluence - indicating promising results for future MAST-U operations. [ABSTRACT FROM AUTHOR]
- Subjects :
- FUSION reactor divertors
HEAT flux
ELECTRON density
ACTINIC flux
EDGES (Geometry)
Subjects
Details
- Language :
- English
- ISSN :
- 00295515
- Volume :
- 60
- Issue :
- 6
- Database :
- Complementary Index
- Journal :
- Nuclear Fusion
- Publication Type :
- Academic Journal
- Accession number :
- 143762074
- Full Text :
- https://doi.org/10.1088/1741-4326/ab826a