Bulletin of the American Physical Society
64th Annual Meeting of the APS Division of Plasma Physics
Volume 67, Number 15
Monday–Friday, October 17–21, 2022; Spokane, Washington
Session NP11: Poster Session V: In-Person, Hall A (9:30-11:00am) and Virtual Poster Presentations (11:15am-12:30pm)
MFE: Stellerators
HED: High Energy Density
BEAMS: Short Pulse Laser Plasmas
HED: Short Pulse Laser Plasma
SPACE: Space Plasmas
9:30 AM - 12:30 PM
Wednesday, October 19, 2022
Room: Exhibit Hall A and Online
Abstract: NP11.00155 : Investigation of Shear-Driven Electron-Ion Hybrid Scale Instabilities at Dipolarization Fronts
Presenter:
Landry Horimbere
(University of Maryland)
Author:
Landry Horimbere
(University of Maryland)
Additionally, I perform particle-in-cell simulations of the evolution of unmagnetized and magnetized plasma jets, to understand the relaxation mechanisms of plasma shear layers. I find that the unmagnetized system evolves symmetrically, develops small electron eddies that dissipate quickly, has minimally perturbed ions, and develops stabilizing antisymmetric electric and magnetic fields that bring it to a non-linear steady state. In contrast, the magnetized KH case evolves asymmetrically. On the misaligned (low field) side of the jet, the electrons develop vortices that dissipate relatively slowly, generate waves as they merge, and dramatically destabilize the entire plasma, including the ions.
Finally, I compare the numerical and analytical results to measurements from the NRL space simulation chamber sheared plasma experiment. I find that, in agreement with theory, the amplitude of the waves detected grows with the applied electric field gradient and resultant velocity shear.
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