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Title: Thermal dynamics in the flux-coordinate independent turbulence code GRILLIX

Journal Article · · Contributions to Plasma Physics
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  1. Max Planck Inst. for Plasma Physics, Garching (Germany)
  2. MIT Plasma Science and Fusion Center, Cambridge, MA (United States)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  4. Dartmouth College, Hanover, NH (United States)
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GRILLIX employs the flux–coordinate independent approach (FCI), which allows us to study boundary plasma turbulence in realistic diverted configurations. Recently, the physical model in GRILLIX has been extended to a global drift–reduced Braginskii model, without any separation between background and fluctuations. It includes electromagnetic and thermal dynamics with hot ions, relaxation of the Boussinesq approximation and non–linear parametric dependencies. This contribution presents solutions to associated issues, that is, the ion diamagnetic polarization and the stiff parallel heat conduction. Simulations based on parameters characteristic for the Alcator C–Mod tokamak were carried out. In circular geometry, the self–consistent electric field contains zonal flows and geodesic acoustic modes in the confined region. In the scrape–off layer, the electron parallel heat conduction and its boundary condition determine the temperature and electric field, leading to sheared flows at the last closed flux surface.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1771445
Report Number(s):
LLNL-JRNL--820526; 1031904
Journal Information:
Contributions to Plasma Physics, Journal Name: Contributions to Plasma Physics Journal Issue: 5-6 Vol. 60; ISSN 0863-1042
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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Global 3D two-fluid simulations of the tokamak edge region: Turbulence, transport, profile evolution, and spontaneous E   ×   B rotation journal May 2017
Global turbulence simulations of the tokamak edge region with GRILLIX journal May 2019
Nonlinear reduced Braginskii equations with ion thermal dynamics in toroidal plasma journal June 1997
Direct measurement of zonal flows and geodesic acoustic mode oscillations in ASDEX Upgrade using Doppler reflectometry journal July 2005
Gyrofluid turbulence studies of the effect of the poloidal position of an axisymmetric Debye sheath journal April 2008
Hermes: global plasma edge fluid turbulence simulations journal April 2017
GRILLIX: a 3D turbulence code based on the flux-coordinate independent approach journal January 2018
The Plasma Boundary of Magnetic Fusion Devices book January 2000
Code Verification by the Method of Manufactured Solutions report June 2000

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70 PLASMA PHYSICS AND FUSION TECHNOLOGY
SOL
drifts
edge
flux‐coordinate independent
heat conduction
turbulence