TITLE

Coupling of laser energy into hot-electrons in high-contrast relativistic laser-plasma interactions

AUTHOR(S)
Kemp, G. E.; Link, A.; Ping, Y.; Schumacher, D. W.; Freeman, R. R.; Patel, P. K.
PUB. DATE
March 2013
SOURCE
Physics of Plasmas;Mar2013, Vol. 20 Issue 3, p033104
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We use particle-in-cell simulations to explain the mechanisms responsible for the coupling of laser energy into relativistic electrons for the case of sharp interface, solid density metal targets free of pre-plasma. For perfectly flat interfaces, the accelerated electron trajectories are dominated by the standing-wave (SW) field structure formed by interference between incident and reflected pulses. We find that quasi-static magnetic fields that develop near the interface play only a minor role in perturbing the relativistic electron trajectories but can contribute to enhanced absorption. Target surfaces that are structured exhibit enhanced absorption, and the acceleration mechanism deviates from the clean standing-wave acceleration mechanism leading to more stochastic electron heating and larger divergence angles.
ACCESSION #
86447081

 

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