Spectral treatment of gyrokinetic profile curvature

Candy, J.; Belli, E. A.; Staebler, G.

doi:10.1088/1361-6587/ab759c

Title: Spectral treatment of gyrokinetic profile curvature

Journal Article · 25 February 2020 · Plasma Physics and Controlled Fusion

DOI: https://doi.org/10.1088/1361-6587/ab759c · OSTI ID:1740022

^[1]; Belli, E. A. ^[2];

^[2]

General Atomics, San Diego, CA (United States); General Atomics, Energy & Advanced Concepts, DIII-D
General Atomics, San Diego, CA (United States)

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.

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

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

Grant/Contract Number:: FC02-06ER54873; FG02-95ER54309; AC05-00OR22725

OSTI ID:: 1740022

Alternate ID(s):: OSTI ID: 23027371

Journal Information:: Plasma Physics and Controlled Fusion, Journal Name: Plasma Physics and Controlled Fusion Journal Issue: 4 Vol. 62; ISSN 0741-3335

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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