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 YP11: Poster Session IX: The crossover between high-energy-density plasmas and ultracold neutral plasmas ; Supplemental; Post-Deadline Abstracts (9:30am-12:30pm)
Friday, November 9, 2018
OCC
Room: Exhibit Hall A1&A
Abstract ID: BAPS.2018.DPP.YP11.54
Abstract: YP11.00054 : Numerical Simulation of an Experimental Turbulent Dynamo on the OMEGA-EP Laser*
Presenter:
Andy Sha Liao
(Los Alamos National Laboratory)
Authors:
Andy Sha Liao
(Los Alamos National Laboratory)
Shengtai Li
(Los Alamos National Laboratory)
Kirk Flippo
(Los Alamos National Laboratory)
Hui Li
(Los Alamos National Laboratory)
Chikang Li
(Massachusetts Inst of Tech-MIT)
Turbulent dynamos that exponentially amplify initially small, seed magnetic fields are crucial in magnetizing the universe. Until now, the ideal environment for turbulent dynamos to grow has proved difficult to recreate. In a new approach, we leverage the long pulse capability of the OMEGA-EP laser to recreate the highly conductive and inviscid (Rem ~ 3000, Prm ~ 1) growth environment of the turbulent dynamo within the magnetized plasma jet ablated from a simple cone target of CH plastic. In 3-D FLASH simulations of our scheme, we find that the dynamo environment is a typically ~ 0.5 mm3, ~ 1 keV hot spot where the laser beams intersect to produce maximum direct heating of the jet plasma. The dynamo environment is maintained from the onset of steady flows through the ~ 10 ns length of the laser pulse. For a plasma vorticity of 0.3-1.5 ns-1 and a dynamo active over 2-4 ns, the magnetic energy detectably increases on an exponential trajectory by a factor of a few. By demonstrating the tight dependence of dynamo activity on an easily-controlled variable, i.e. the laser beams, we show that our scheme can readily be extended to study even more complex behaviors.
*This research used resources provided by the LANL LDRD program 20170367ER, and the LANL IC program DE-AC52-06NA25396.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DPP.YP11.54
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