Dynamic mode decomposition for gyrokinetic eigenmode analysis

Dudkovskaia, Alexandra V.; Li, D.; Candy, J.; Belli, E. A.; Yang, C.

doi:10.1088/1361-6587/addb73

Dynamic mode decomposition for gyrokinetic eigenmode analysis

Journal Article · Wed Jun 11 00:00:00 EDT 2025 · Plasma Physics and Controlled Fusion

DOI:https://doi.org/10.1088/1361-6587/addb73· OSTI ID:2584418

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University of York (United Kingdom)
University of Massachusetts, Amherst, MA (United States)
General Atomics, San Diego, CA (United States)
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Dynamic mode decomposition (DMD) is a post-processing approach to decompose a complex time series into a set of modes via spectral analysis. DMD provides a new and powerful method to recover gyrokinetic drift-wave eigenfrequencies and eigenfunctions based only on the solution of the gyrokinetic-Maxwell initial value problem with almost no added cost to the initial value solver. In the present paper, DMD is applied to the CGYRO gyrokinetic code using a newly-developed CGYRO-DMD post-processor. CGYRO-DMD is numerically efficient, even on a single CPU. It does not set any restrictions on the plasma shape, beta (ratio of the plasma pressure to the magnetic field pressure), collisionality or number of species, and allows one to resolve numerous eigenmodes, even of comparable growth rates. In addition, DMD is not limited to unstable modes, but rather can capture stable and unstable branches simultaneously. In this work, we illustrate the accuracy of DMD through gyrokinetic analysis of mode transition for electromagnetic drift wave instabilities.

View Accepted Manuscript (DOE)

Research Organization:: General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: SC0024425; FG02-95ER54309

OSTI ID:: 2584418

Alternate ID(s):: OSTI ID: 2572721

Journal Information:: Plasma Physics and Controlled Fusion, Journal Name: Plasma Physics and Controlled Fusion Journal Issue: 6 Vol. 67; ISSN 0741-3335; ISSN 1361-6587

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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eigenmode analysis
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Dynamic mode decomposition for gyrokinetic eigenmode analysis

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