Fil, Alexandre, Lipschultz, Bruce orcid.org/0000-0001-5968-3684, Moulton, David et al. (4 more authors) (2022) Comparison between MAST-U conventional and Super-X configurations through SOLPS-ITER modelling. Nuclear Fusion. 096026. ISSN 1741-4326
Abstract
MAST-U has recently started operating with a Super-X divertor, designed to increase total flux expansion and neutral trapping, both predicted through simple analytic models and SOLPS calculations to reduce the plasma and impurity density detachment thresholds. In this study, utilising the SOLPS-ITER code, we are quantifying the possible gain allowed by the MAST-U Super-X and neutral baffling geometry, in terms of access to detachment. We show that a significant reduction of the upstream density detachment threshold (up to a factor 1.6) could be achieved in MAST-U, for the Super-X, as opposed to conventional divertor geometry, mainly through an increased total flux expansion, neutral trapping being found very similar between the different configurations. We also show that variations of the strike-point angle are complex to interpret in such a tightly baffled geometry, and that a case in which the target normal points more towards the separatrix does not necessarily imply a lower detachment threshold. As in previous calculations for TCV, we quantify the role of neutral effects through developing and applying a quantitative definition of neutral trapping.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2022 Crown copyright. |
Dates: |
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Institution: | The University of York |
Academic Units: | The University of York > Faculty of Sciences (York) > Physics (York) |
Funding Information: | Funder Grant number EPSRC EP/N023846/1 |
Depositing User: | Pure (York) |
Date Deposited: | 31 Aug 2022 14:00 |
Last Modified: | 27 Nov 2024 00:43 |
Published Version: | https://doi.org/10.1088/1741-4326/ac81d8 |
Status: | Published |
Refereed: | Yes |
Identification Number: | 10.1088/1741-4326/ac81d8 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:190487 |
Downloads
Filename: MAST_U_NF_Letter_final_submited_and_accepted.pdf
Description: MAST_U_NF_Letter_final_submited_and_accepted
Filename: Fil_2022_Nucl._Fusion_62_096026.pdf
Description: Comparison between MAST-U conventional and Super-X configurations through SOLPS-ITER modelling
Licence: CC-BY 2.5