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Title: Gyroaveraging operations using adaptive matrix operators

A new adaptive scheme to be used in particle-in-cell codes for carrying out gyroaveraging operations with matrices is presented. This new scheme uses an intermediate velocity grid whose resolution is adapted to the local thermal Larmor radius. The charge density is computed by projecting marker weights in a field-line following manner while preserving the adiabatic magnetic moment μ. These choices permit to improve the accuracy of the gyroaveraging operations performed with matrices even when strong spatial variation of temperature and magnetic field is present. Accuracy of the scheme in different geometries from simple 2D slab geometry to realistic 3D toroidal equilibrium has been studied. As a result, a successful implementation in the gyrokinetic code XGC is presented in the delta-f limit.
Authors:
ORCiD logo [1] ;  [1] ; ORCiD logo [1]
  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Publication Date:
Grant/Contract Number:
17-SC-20-SC; AC02-09CH1466
Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 25; Journal Issue: 5; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Research Org:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
OSTI Identifier:
1440783
Alternate Identifier(s):
OSTI ID: 1437525

Dominski, Julien, Ku, Seung -Hoe, and Chang, Choong -Seock. Gyroaveraging operations using adaptive matrix operators. United States: N. p., Web. doi:10.1063/1.5026767.
Dominski, Julien, Ku, Seung -Hoe, & Chang, Choong -Seock. Gyroaveraging operations using adaptive matrix operators. United States. doi:10.1063/1.5026767.
Dominski, Julien, Ku, Seung -Hoe, and Chang, Choong -Seock. 2018. "Gyroaveraging operations using adaptive matrix operators". United States. doi:10.1063/1.5026767.
@article{osti_1440783,
title = {Gyroaveraging operations using adaptive matrix operators},
author = {Dominski, Julien and Ku, Seung -Hoe and Chang, Choong -Seock},
abstractNote = {A new adaptive scheme to be used in particle-in-cell codes for carrying out gyroaveraging operations with matrices is presented. This new scheme uses an intermediate velocity grid whose resolution is adapted to the local thermal Larmor radius. The charge density is computed by projecting marker weights in a field-line following manner while preserving the adiabatic magnetic moment μ. These choices permit to improve the accuracy of the gyroaveraging operations performed with matrices even when strong spatial variation of temperature and magnetic field is present. Accuracy of the scheme in different geometries from simple 2D slab geometry to realistic 3D toroidal equilibrium has been studied. As a result, a successful implementation in the gyrokinetic code XGC is presented in the delta-f limit.},
doi = {10.1063/1.5026767},
journal = {Physics of Plasmas},
number = 5,
volume = 25,
place = {United States},
year = {2018},
month = {5}
}