Abstract
We investigate the formation of a laser-produced magnetized jet under conditions of a varying mass ejection rate and a varying divergence of the ejected plasma flow. This is done by irradiating a solid target placed in a 20T magnetic field with, first, a collinear precursor laser pulse (10^{12} W/cm^{2}) and, then, a main pulse (10^{13} W/cm^{2}) arriving 9-19ns later. Varying the time delay between the two pulses is found to control the divergence of the expanding plasma, which is shown to increase the strength of and heating in the conical shock that is responsible for jet collimation. These results show that plasma collimation due to shocks against a strong magnetic field can lead to stable, astrophysically relevant jets that are sustained over time scales 100 times the laser pulse duration (i.e., >70 ns), even in the case of strong variability at the source.
Highlights
We investigate the formation of a laser-produced magnetized jet under conditions of a varying mass ejection rate and a varying divergence of the ejected plasma flow. This is done by irradiating a solid-target placed in a 20 T magnetic field with, first, a co-linear precursor laser pulse (1012 W/cm2) and, a main pulse (1013 W/cm2) arriving 9 to 19 ns later
Varying the timedelay between the two pulses is found to control the divergence of the expanding plasma, which is shown to increase the strength of and heating in the conical shock that is responsible for jet collimation
These results show that plasma collimation due to shocks against a strong magnetic field can lead to stable, astrophysically-relevant jets, that are sustained over time-scales one-hundred times the laser pulse duration (i.e. > 70 ns), even in the case of strong variability at the source
Summary
The article has been published as: Enhancement of Quasistationary Shocks and Heating via Temporal Staging in a Magnetized Laser-Plasma Jet Enhancement of quasi-stationary shocks and heating via temporal-staging in a magnetized, laser-plasma jet This is done by irradiating a solid-target placed in a 20 T magnetic field with, first, a co-linear precursor laser pulse (1012 W/cm2) and, a main pulse (1013 W/cm2) arriving 9 to 19 ns later.
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