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 CP11: Poster Session II: In-Person, Hall A (2:00-3:30pm) and Virtual Poster Presentations (3:45-5:00pm)
MFE: Low Aspect Ratio; Superconducting
FUND: Nonneutral, Antimatter, Strong coupled Plasmas; Waves
2:00 PM - 5:00 PM
Monday, October 17, 2022
Room: Exhibit Hall A and Online
Abstract: CP11.00115 : Nonlocal transport witnessed in Vlasov-Fokker-Planck simulations of the return current instability
Presenter:
Jeffery Zielinski
(University of Alberta)
Authors:
Jeffery Zielinski
(University of Alberta)
Mark Sherlock
(Lawrence Livermore Natl Lab)
Avram Milder
(University of Alberta)
Colin J Bruulsema
(Univ of Alberta)
George F Swadling
(Lawrence Livermore Natl Lab)
Wojciech Rozmus
(Univ of Alberta)
due to the buildup of an electric field from the rapid motion of superthermal electrons. This
electric field drives a return current in the bulk of the electrons, which can couple to Ion Acoustic
Waves (IAWs), becoming unstable if the electron drift velocity exceeds the sound speed. Several
nonlocal transport models can approximate these kinetic effects, however hydrodynamic codes
often employ constant-valued flux limiters, and an accurate understanding of the transport
processes, including the role of the Return Current Instability (RCI), is lacking.
Kinetic simulations with the code K2 [1], considering Vlasov-Fokker-Planck electrons, and
Vlasov ions show the growth of IAWs, as a result of the RCI. The growth rate and saturation
level of these IAWs is compared to experimental data [2], obtained using Thomson scattering
diagnostics. The effect of laser heating is accounted for, and was shown in steady-state K2
simulations to significantly impact the linear growth rate and threshold, by altering the shape
of the electron distribution function [2].
[1] M. Sherlock, J. P. Brodrick, and C.P. Ridgers, Phys. Plasmas 24, 082706 (2017)
[2] A. L. Milder, J. Zielinski, J. Katz, et al. Submitted for Publication (2022)
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