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Velocity-space sensitivity and inversions of synthetic ion cyclotron emission
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Schmidt, B. S., Salewski, M., Reman, B. C. G., Dendy, R. O., Dong, Y., Järleblad, H., Moseev, D., Ochoukov, R., Rud, M. and Valentini, A. (2023) Velocity-space sensitivity and inversions of synthetic ion cyclotron emission. Physics of Plasmas, 30 (9). 092109. doi:10.1063/5.0157126 ISSN 1089-7674.
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WRAP-Velocity-space-sensitivity-inversions-synthetic-ion-cyclotron-23.pdf - Accepted Version - Requires a PDF viewer. Download (4Mb) | Preview |
Official URL: https://doi.org/10.1063/5.0157126
Abstract
This paper introduces a new model to find the velocity-space location of energetic ions generating ion cyclotron emission (ICE) in plasmas. ICE is thought to be generated due to inverted gradients in the v⊥ direction of the velocity distribution function or due to anisotropies, i.e., strong gradients in the pitch direction. Here, we invert synthetic ICE spectra generated from first principles PIC-hybrid computations to find the locations of these ICE-generating ions in velocity space in terms of a probability distribution function. To this end, we compute 2D ICE weight functions based on the magnetoacoustic cyclotron instability, which reveals the velocity-space sensitivity of ICE measurements. As an example, we analyze the velocity-space sensitivity of synthetic ICE measurements near the first 15 harmonics for plasma parameters typical for the Large Helical Device. Furthermore, we investigate the applicability of a least-square subset search, Tikhonov regularization, and Lasso regularization to obtain the locations in velocity space of the ions generating the ICE.
Item Type: | Journal Article | |||||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||
SWORD Depositor: | Library Publications Router | |||||||||
Journal or Publication Title: | Physics of Plasmas | |||||||||
Publisher: | AIP Publishing | |||||||||
ISSN: | 1089-7674 | |||||||||
Official Date: | 11 September 2023 | |||||||||
Dates: |
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Volume: | 30 | |||||||||
Number: | 9 | |||||||||
Article Number: | 092109 | |||||||||
DOI: | 10.1063/5.0157126 | |||||||||
Status: | Peer Reviewed | |||||||||
Publication Status: | Published | |||||||||
Reuse Statement (publisher, data, author rights): | This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in B. S. Schmidt, M. Salewski, B. C. G. Reman, R. O. Dendy, Y. Dong, H. Järleblad, D. Moseev, R. Ochoukov, M. Rud, A. Valentini; Velocity-space sensitivity and inversions of synthetic ion cyclotron emission. Phys. Plasmas 1 September 2023; 30 (9): 092109. and may be found at https://doi.org/10.1063/5.0157126 | |||||||||
Access rights to Published version: | Free Access (unspecified licence, 'bronze OA') | |||||||||
Copyright Holders: | © 2023 Author(s). Published under an exclusive license by AIP Publishing. | |||||||||
Date of first compliant deposit: | 26 September 2023 | |||||||||
Date of first compliant Open Access: | 26 September 2023 | |||||||||
RIOXX Funder/Project Grant: |
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