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Gyrokinetic simulations of turbulence and zonal flows driven by steep profile gradients using a delta-f approach with an evolving background Maxwellian
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Murugappan, M., Villard, L., Brunner, S., McMillan, Ben F. and Bottino, A. (2022) Gyrokinetic simulations of turbulence and zonal flows driven by steep profile gradients using a delta-f approach with an evolving background Maxwellian. Physics of Plasmas, 29 (10). 103904. doi:10.1063/5.0106661 ISSN 1089-7674.
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Official URL: https://doi.org/10.1063/5.0106661
Abstract
Long global gyrokinetic turbulence simulations are particularly challenging in situations where the system deviates strongly from its initial state and when fluctuation levels are high, for example, in strong gradient regions. For particle-in-cell simulations, statistical sampling noise accumulation from large marker weights due to large deviations from the control variate of a delta-f scheme makes such simulations often impractical. An adaptive control variate in the form of a flux-surface-averaged Maxwellian with a time-dependent temperature profile is introduced in an attempt to alleviate the former problem. Under simplified collisionless physics, this adaptive delta-f scheme is shown to reduce noise accumulation in the zonal flows and the simulated heat flux in a quasi-steady turbulent state. The method also avoids the collapse of the signal-to-noise ratio, which occurs in the standard non-adaptive scheme, and, therefore, allows one to reach numerically converged results even with lower marker numbers.
Item Type: | Journal Article | ||||||||||||
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Subjects: | Q Science > QC Physics | ||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||||
SWORD Depositor: | Library Publications Router | ||||||||||||
Library of Congress Subject Headings (LCSH): | Plasma (Ionized gases) -- Research, Nuclear fusion, Plasma dynamics, Controlled fusion | ||||||||||||
Journal or Publication Title: | Physics of Plasmas | ||||||||||||
Publisher: | AIP Publishing | ||||||||||||
ISSN: | 1089-7674 | ||||||||||||
Official Date: | 24 October 2022 | ||||||||||||
Dates: |
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Volume: | 29 | ||||||||||||
Number: | 10 | ||||||||||||
Article Number: | 103904 | ||||||||||||
DOI: | 10.1063/5.0106661 | ||||||||||||
Status: | Peer Reviewed | ||||||||||||
Publication Status: | Published | ||||||||||||
Re-use Statement: | 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 M. Murugappan, L. Villard, S. Brunner, B. F. McMillan, and A. Bottino , "Gyrokinetic simulations of turbulence and zonal flows driven by steep profile gradients using a delta-f approach with an evolving background Maxwellian", Physics of Plasmas 29, 103904 (2022) and may be found at https://doi.org/10.1063/5.0106661 | ||||||||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||||||||
Date of first compliant deposit: | 30 November 2022 | ||||||||||||
RIOXX Funder/Project Grant: |
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