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Title: Effects of dimensionality on kinetic simulations of laser-ion acceleration in the transparency regime

Journal Article · · Physics of Plasmas
DOI:https://doi.org/10.1063/1.4982741· OSTI ID:1364554

A particle-in-cell study of laser-ion acceleration mechanisms in the transparency regime illustrates how two-dimensional (2D) S and P simulations (laser polarization in and out of the simulation plane, respectively) capture different physics characterizing these systems, visible in their entirety often in cost-prohibitive three-dimensional (3D) simulations. The electron momentum anisotropy induced in the target by a laser pulse is dramatically different in the two 2D cases, manifested in differences in target expansion timescales, electric field strengths, and density thresholds for the onset of relativistically induced transparency. In particular, 2D-P simulations exhibit dramatically greater electron heating in the simulation plane, whereas 2D-S ones show a much more isotropic energy distribution, similar to 3D. An ion trajectory analysis allows one to isolate the fields responsible for ion acceleration and to characterize the acceleration regimes in time and space. The artificial longitudinal electron heating in 2D-P exaggerates the effectiveness of target-normal sheath acceleration into its dominant acceleration mechanism throughout the laser-plasma interaction, whereas 2D-S and 3D both have sizable populations accelerated preferentially during transparency.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1364554
Alternate ID(s):
OSTI ID: 1375641
Report Number(s):
LA-UR-17-22260
Journal Information:
Physics of Plasmas, Vol. 24, Issue 5; ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 28 works
Citation information provided by
Web of Science

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Cited By (8)

Laser-plasmas in the relativistic-transparency regime: Science and applications journal May 2017
Harnessing the relativistic Buneman instability for laser-ion acceleration in the transparency regime journal June 2018
A detailed examination of laser-ion acceleration mechanisms in the relativistic transparency regime using tracers journal April 2018
Electrostatic capacitance-type acceleration of ions with an intense few-cycle laser pulse journal April 2019
Laser-ion acceleration using mixed compositions: Tailoring the target for each species journal December 2019
Dominance of hole-boring radiation pressure acceleration regime with thin ribbon of ionized solid hydrogen journal February 2018
Enhanced ion acceleration in the ultra-intense laser driven magnetized collisionless shocks journal April 2019
Dominance of hole-boring radiation pressure acceleration regime with thin ribbon of ionized solid hydrogen text January 2017

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