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.TP11.63
Abstract: TP11.00063 : Measurements of Canonical Helicity and Transport in a Gyrating Kink*
Presenter:
Jens Von Der Linden
(Lawrence Livermore Natl Lab)
Authors:
Jens Von Der Linden
(Lawrence Livermore Natl Lab)
Jason Sears
(Lawrence Livermore Natl Lab)
Thomas Intrator
(Los Alamos Natl Lab)
Setthivoine You
(University of Tokyo)
Canonical flux tubes provide a topological perspective on reconnection and dynamo problems as the flux tubes do not break, even under non-ideal conditions, and the conservation of their helicity constrains the energy transfer between magnetic field and particles. We present measurements of canonical flux tubes, their helicity, and their helicity transport in a gyrating plasma kink. The helicity gauge is removed with general techniques valid even if only a limited section of the plasma is measured. Taylor diagrams evaluate these gauge removal techniques in terms of their effect on the normalized helicity density, and root mean square difference and lengths of the vector fields. Temporal asymmetries in the helicities confirm irreducible 3D fields in the kink. The transport of canonical helicity includes static injection through an applied voltage, a resistive sink term, and the change in reference fields corresponding to the change in helicity due to the motion of the flux rope in and out of the measurement volume.
*LLNL-ABS-753762 is supported by US DOE Grant SE-SC0010340, NASA Geospace NNHIOA044I-Basic, the Center for Magnetic Self Organization funded by the NSF and DOE, Office of Fusion Energy Sciences and prepared in part by LLNL under Contract DE-AC52-07NA27344.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DPP.TP11.63
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