Senstius, Mads Givskov, Nielsen, S Kragh, Vann, Roddy G L orcid.org/0000-0002-3105-2546 et al. (1 more author) (2019) Particle-in-cell simulations of parametric decay instabilities at the upper hybrid layer of fusion plasmas to determine their primary threshold. Plasma Physics and Controlled Fusion. 025010. ISSN 1361-6587
Abstract
Parametric decay instabilities (PDIs) are nonlinear processes by which energy from a strong pump wave may be directed into other waves at other frequencies, in particular natural modes of the medium, provided that energy and momentum are conserved. The particle-in-cell (PIC) code EPOCH is used to simulate PDIs in a magnetically confined fusion plasma converting a 105 GHz microwave X-mode pump wave into electrostatic daughter waves at the upper hybrid (UH) layer. Modes associated with the PDIs as well as a linearly converted electron Bernstein wave (EBW) are identified in f- and k-space. The PDI daughter modes are found to agree with experimental observations from ASDEX Upgrade as well as with analytical predictions, showing a nonlinear increase in power above a predicted threshold.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2019 Technical University of Denmark. 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. |
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: | 02 Oct 2019 08:31 |
Last Modified: | 23 Oct 2024 00:09 |
Published Version: | https://doi.org/10.1088/1361-6587/ab49ca |
Status: | Published |
Refereed: | Yes |
Identification Number: | 10.1088/1361-6587/ab49ca |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:151629 |
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