e-PLAS Analysis of Short Pulse Laser-Matter Interaction Experiments
SAN DIEGO UNIV CA
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The transport of relativistic electrons1 generated in wire and foil targets by short-pulse lasers is examined with the new e-PLAS simulation code based on implicit-moment hybrid2 techniques. In a 50 m diameter Cu wire Zeff 15 as recently illuminated on the TITAN LLNL laser, for example, a 1.7x1020 Wcm2 simulated laser beam delivering a flat 30 m spot from the left with 40 absorption generates the hot electron density profile depicted below at 940 fs. The peak hot density in the laser spot is 3x1021 electronscm3. This density drops to 3x1019 electronscm3 200 microns into the wire. A peak temperature of 2 keV is achieved through Joule heating of the background electrons in the wire head near the deposition surface a significantly lower 0.4 keV is achieved in the wire body. Here, 300 MG thermoelectric B-fields are also calculated. Parameter studies relate the hot electron stopping to the surface B-field, modest drag slowing, and the background cold electron resisitvity, which is bleached by background heating to low values at late times.
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