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 TP11: Poster Session VII: Basic Plasma Physics: Pure Electron Plasma, Strongly Coupled Plasmas, Self-Organization, Elementary Processes, Dusty Plasmas, Sheaths, Shocks, and Sources; Mini-conference on Nonlinear Waves and Processes in Space Plasmas - Posters; MHD and Stability, Transients (2), Runaway Electrons; NSTX-U; Spherical Tokamaks; Analytical and Computational Techniques; Diagnostics (9:30am-12:30pm)
Thursday, November 8, 2018
OCC
Room: Exhibit Hall A1&A
Abstract ID: BAPS.2018.DPP.TP11.77
Abstract: TP11.00077 : Plasma Response to Perturbed Nonaxisymmetric Fields in Double Null Configurations*
Presenter:
Alan Douglas Turnbull
(General Atomics - San Diego)
Authors:
Alan Douglas Turnbull
(General Atomics - San Diego)
Brendan C Lyons
(General Atomics - San Diego)
Todd E Evans
(General Atomics - San Diego)
Yueqiang Liu
(General Atomics)
Carlos Alberto Paz-Soldan
(General Atomics - San Diego)
Edward J Strait
(General Atomics - San Diego)
David Weisberg
(General Atomics)
Morgan Shafer
(Oak Ridge National Laboratory)
Andreas Wingen
(Oak Ridge National Lab)
Allan Reiman
(Princeton Plasma Phys Lab)
The plasma response to external nonaxisymmetric perturbations is a key ingredient in the observed ELM suppression from external fields. Dedicated experiments in DIII-D have confirmed a prior observation that the magnetic response on the inboard high field side in balanced double null (DN) plasmas is greatly reduced compared to the signal in similar single null (SN) discharges, as well as to the outboard signals. This is a key part of the puzzle in explaining ELM suppression: full suppression has not been observed in DN in any experiments despite the large density pumpout that typically occurs in those conditions. Analysis of sequences of equilibria with scans in the magnetic balance and edge safety factor q95 indicates that there is a relatively narrow window in magnetic balance over which the inboard signal is suppressed by a factor of five. In this range, the density pumpout is enhanced and the ELMs are mitigated but not suppressed. Comparisons of various code predictions for the response with external magnetic data and internal SXR data confirm the observed inboard magnetic field suppression. The results are discussed in the context of the key competing models for ELM suppression and mitigation.
**Work supported by US DOE under DE-FC02-04ER54698 and DE-FG02-95ER54309.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DPP.TP11.77
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