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Title: Spectral treatment of gyrokinetic profile curvature

Abstract

Using a novel wavenumber-advection algorithm, we show that profile curvature (shear in the profile gradient) can be implemented with spectral accuracy in gyrokinetic turbulence simulations. Here, this approach enables a global simulation capability with the relatively low cost and high accuracy of local simulations. Using this new algorithm, we show that for a well-studied tokamak core test case, the effect of temperature-gradient curvature is below the threshold of detectability for experimentally-relevant values of curvature.

Authors:
ORCiD logo [1];  [1]; ORCiD logo [1]
  1. General Atomics, San Diego, CA (United States)
Publication Date:
Research Org.:
General Atomics, San Diego, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
OSTI Identifier:
1740022
Grant/Contract Number:  
FC02-06ER54873; FG02-95ER54309; AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Plasma Physics and Controlled Fusion
Additional Journal Information:
Journal Volume: 62; Journal Issue: 4; Journal ID: ISSN 0741-3335
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Gyrokinetic; turbulence; shear; global; spectral

Citation Formats

Candy, J., Belli, E. A., and Staebler, G.. Spectral treatment of gyrokinetic profile curvature. United States: N. p., 2020. Web. https://doi.org/10.1088/1361-6587/ab759c.
Candy, J., Belli, E. A., & Staebler, G.. Spectral treatment of gyrokinetic profile curvature. United States. https://doi.org/10.1088/1361-6587/ab759c
Candy, J., Belli, E. A., and Staebler, G.. Wed . "Spectral treatment of gyrokinetic profile curvature". United States. https://doi.org/10.1088/1361-6587/ab759c. https://www.osti.gov/servlets/purl/1740022.
@article{osti_1740022,
title = {Spectral treatment of gyrokinetic profile curvature},
author = {Candy, J. and Belli, E. A. and Staebler, G.},
abstractNote = {Using a novel wavenumber-advection algorithm, we show that profile curvature (shear in the profile gradient) can be implemented with spectral accuracy in gyrokinetic turbulence simulations. Here, this approach enables a global simulation capability with the relatively low cost and high accuracy of local simulations. Using this new algorithm, we show that for a well-studied tokamak core test case, the effect of temperature-gradient curvature is below the threshold of detectability for experimentally-relevant values of curvature.},
doi = {10.1088/1361-6587/ab759c},
journal = {Plasma Physics and Controlled Fusion},
number = 4,
volume = 62,
place = {United States},
year = {2020},
month = {2}
}

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