Bulletin of the American Physical Society
60th Annual Meeting of the APS Division of Plasma Physics
Volume 63, Number 11
Monday–Friday, November 5–9, 2018; Portland, Oregon
Session PP11: Poster Session VI: Relativistic Laser Plasma Interaction and Beam Physics; Boundary; MHD and Stability, Transients; FRC; Dusty Plasmas; Basic Studies; Computational and Diagnostic Methods (2:00pm-5:00pm)
Wednesday, November 7, 2018
OCC
Room: Exhibit Hall A1&A
Abstract ID: BAPS.2018.DPP.PP11.55
Abstract: PP11.00055 : NIMROD Simulations of Forced Magnetic Reconnection in DIII-D Limited L-mode Plasmas*
Presenter:
Matthew Beidler
(Univ of Wisconsin, Madison)
Authors:
Matthew Beidler
(Univ of Wisconsin, Madison)
James D Callen
(Univ of Wisconsin, Madison)
Todd E Evans
(General Atomics - San Diego)
Chris C Hegna
(Univ of Wisconsin, Madison)
Morgan Shafer
(Oak Ridge National Laboratory)
Carl Sovinec
(Univ of Wisconsin, Madison)
This work focuses on physics of mode penetration in limited, L-mode plasmas in the DIII-D tokamak using the extended-magnetohydrodynamic code NIMROD. Simulations are initialized with results from kinetic-EFIT for magnetic profiles, OMFIT for thermal and rotation profiles, and TRIP3D for vacuum magnetic perturbation fields. When the resonant magnetic perturbation (RMP) magnitude is increased in a rotating plasma, the electromagnetic force imparted by the RMP on the flow-screened island can decrease the local flow, causing the external field to rapidly penetrate. Furthermore, the plasma response at a rational surface depends on dissipation and rotation, setting the threshold RMP for mode penetration. To elucidate the plasma response due to applied RMPs, we present parametric analyses of linear simulations scaling rotation and dissipation. Numerical results are compared to conventional analytical treatments including tearing and twisting plasma responses. Intuition gained from linear results will be utilized in a nonlinear study of mode penetration with tentative comparisons to DIII-D results.
*Supported by DOE OFES grants DE-FG02-86ER53218 and DE-FC02-04ER54698, and the US DOE FES Postdoctoral Research program administered by ORISE and managed by ORAU under DOE contract DE-SC0014664.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DPP.PP11.55
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