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Orb5: A global electromagnetic gyrokinetic code using the PIC approach in toroidal geometry

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Lanti, E., Ohana, N., Tronko, N., Hayward-Schneider, T., Bottino, A., McMillan, Ben F., Mishchenko, A., Scheinberg, A., Biancalani, A., Angelino, P. et al.
(2020) Orb5: A global electromagnetic gyrokinetic code using the PIC approach in toroidal geometry. Computer Physics Communications, 251 . 107072. doi:10.1016/j.cpc.2019.107072

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Official URL: https://doi.org/10.1016/j.cpc.2019.107072

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Abstract

This paper presents the current state of the global gyrokinetic code Orb5 as an update of the previous reference (Jolliet et al., 2007). The Orb5 code solves the electromagnetic Vlasov-Maxwell system of equations using a PIC scheme and also includes collisions and strong flows. The code assumes multiple gyrokinetic ion species at all wavelengths for the polarization density and drift-kinetic electrons. Variants of the physical model can be selected for electrons such as assuming an adiabatic response or a “hybrid” model in which passing electrons are assumed adiabatic and trapped electrons are drift-kinetic. A Fourier filter as well as various control variates and noise reduction techniques enable simulations with good signal-to-noise ratios at a limited numerical cost. They are completed with different momentum and zonal flow-conserving heat sources allowing for temperature-gradient and flux-driven simulations. The code, which runs on both CPUs and GPUs, is well benchmarked against other similar codes and analytical predictions, and shows good scalability up to thousands of nodes.

Item Type: Journal Article
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
SWORD Depositor: Library Publications Router
Library of Congress Subject Headings (LCSH): Tokamaks, Plasma turbulence, Physics -- Computer programs
Journal or Publication Title: Computer Physics Communications
Publisher: Elsevier
ISSN: 0010-4655
Official Date: June 2020
Dates:
DateEvent
June 2020Published
30 November 2019Available
20 November 2019Accepted
Volume: 251
Article Number: 107072
DOI: 10.1016/j.cpc.2019.107072
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
ID s760Centro Svizzero di Calcolo Scientificohttp://viaf.org/viaf/135813097
633053H2020 Euratomhttp://dx.doi.org/10.13039/100010687
UNSPECIFIEDSchweizerischer Nationalfonds zur Förderung der Wissenschaftlichen ForschungUNSPECIFIED

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