April 15-17

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approveddimits_sherwood_18_rf_v1.pdf2019-02-21 17:18:54Andris Dimits

Abstracts

Author: Andris Dimits
Requested Type: Poster
Submitted: 2019-02-21 17:17:14

Co-authors: M. V. Umansky, I. Joseph, T. Rognlien , LLNL, J. Myra, Lodestar Research, D. Smithe, Tech-X Corporation

Contact Info:
Lawrence Livermore National Laboratory
PO Box 808
Livermore, USA   94550
USA

Abstract Text:
We discuss progress on including RF effects in tokamak edge/Scrape-Off-Layer (SOL)-relevant turbulence simulations. A capability for studying effects of boundary conditions representing RF launching structures on turbulent solutions such as those from the SOLT3D code is being developed. SOLT3D is a 3D BOUT++-based extension of the SOLT model [1] currently under development at LLNL. Simple model RF-sheath boundary conditions, involving regions on the outer flux surface biased at an effective potential relative to other parts of the surface and other boundary surfaces, are being implemented and tested in SOLT3D. A steady axisymmetric version of the SOLT3D model has also been implemented in the COMSOL Finite-EleMent (FEM) package. This can be used to benchmark SOLT3D solutions and is also capable of handling more complicated domains and boundary shapes, such as indentations representing antenna and shielding structures, than is currently possible under BOUT++. The values of fields on a flux surface in the FEM solutions can be used as boundary conditions in BOUT++-based (e.g., SOLT3D turbulence) simulations. Progress on developing such a simulation workflow will be discussed, and results from verification studies and initial simulations will be presented. The inclusion of ponderomotive effects in the SOLT3D model will also be discussed.

[1] J. R. Myra, D. A. Russell, D. A. D’Ippolito, Phys. Plasmas 15, 032304 (2008)

*Prepared for US DOE by LLNL under Contract DE-AC52-07NA27344 and supported by the U.S. DOE OFES, in part through SciDAC FWP-2017-LLNL-SCW1619, at Lodestar under DE-AC05-00OR22725 subcontract 4000158507, and at Tech-X under DE-SC0018319.

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