Nardon, E., Fil, A., Chauveau, P. et al. (6 more authors) (2017) On the mechanisms governing gas penetration into a tokamak plasma during a massive gas injection. Nuclear Fusion. 016027. ISSN 1741-4326
Abstract
A new 1D radial fluid code, IMAGINE, is used to simulate the penetration of gas into a tokamak plasma during a massive gas injection (MGI). The main result is that the gas is in general strongly braked as it reaches the plasma, due to mechanisms related to charge exchange and (to a smaller extent) recombination. As a result, only a fraction of the gas penetrates into the plasma. Also, a shock wave is created in the gas which propagates away from the plasma, braking and compressing the incoming gas. Simulation results are quantitatively consistent, at least in terms of orders of magnitude, with experimental data for a D 2 MGI into a JET Ohmic plasma. Simulations of MGI into the background plasma surrounding a runaway electron beam show that if the background electron density is too high, the gas may not penetrate, suggesting a possible explanation for the recent results of Reux et al in JET (2015 Nucl. Fusion 55 093013).
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details |
Keywords: | disruption mitigation,fluid dynamics,massive gas injection |
Dates: |
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Institution: | The University of York |
Academic Units: | The University of York > Faculty of Sciences (York) > Physics (York) |
Depositing User: | Pure (York) |
Date Deposited: | 05 Apr 2018 13:20 |
Last Modified: | 16 Oct 2024 14:36 |
Published Version: | https://doi.org/10.1088/0029-5515/57/1/016027 |
Status: | Published |
Refereed: | Yes |
Identification Number: | 10.1088/0029-5515/57/1/016027 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:129342 |
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