19 research outputs found
Multi-Cascade Proton Acceleration by Superintense Laser Pulse in the Regime of Relativistically Induced Slab Transparency
A regime of multi-cascade proton acceleration in the interaction of
W/cm laser pulse with a structured target is proposed.
The regime is based on the electron charge displacement under the action of
laser ponderomotive force and on the effect of relativistically induced slab
transparency which allows to realize idea of multi-cascade acceleration. It is
shown that a target comprising several properly spaced apart thin foils can
optimize the acceleration process and give at the output quasi-monoenergetic
beams of protons with energies up to hundreds of MeV with energy spread of just
few percent.Comment: 5 pages with 4 figure
Ultrarelativistic nanoplasmonics as a new route towards extreme intensity attosecond pulses
The generation of ultra-strong attosecond pulses through laser-plasma
interactions offers the opportunity to surpass the intensity of any known
laboratory radiation source, giving rise to new experimental possibilities,
such as quantum electrodynamical tests and matter probing at extremely short
scales. Here we demonstrate that a laser irradiated plasma surface can act as
an efficient converter from the femto- to the attosecond range, giving a
dramatic rise in pulse intensity. Although seemingly similar schemes have been
presented in the literature, the present setup deviates significantly from
previous attempts. We present a new model describing the nonlinear process of
relativistic laser-plasma interaction. This model, which is applicable to a
multitude of phenomena, is shown to be in excellent agreement with
particle-in-cell simulations. We provide, through our model, the necessary
details for an experiment to be performed. The possibility to reach intensities
above 10^26 W/cm^2, using upcoming 10 petawatt laser sources, is demonstrated.Comment: 15 pages, 5 figure
One-dimensional steady-state structures at relativistic interaction of laser radiation with overdense plasma for finite electron temperature
One-dimensional steady-state plasma-field structures in overdense plasma are
studied assuming that the electron temperature is uniform over plasma bulk and
the ions are stationary. It is shown that there may exist solutions for
electron distributions with cavitation regions in plasma under the action of
ponderomotive forceComment: 6 pages, 4 figure
Effect of finite ion mass on relativistic self-induced transparency of plasma layers with a sharp boundary
Towards attosecond-scale highly directed GeV gamma-ray sources with multipetawatt-class lasers
We consider a possibility of constructing a gamma-ray source based on the multibeam configuration of a multipetawatt laser system which we simulate using a converging dipole wave. It is shown that such a configuration of fields allows the generation of gamma radiation with narrow directivity of about 1 mrad in the form of pulse trains or isolated pulses on the attosecond timescale. The influence of quantum electrodynamic cascade development on the parameters of generated gamma bursts is studied
Hybrid CPU + Xeon Phi implementation of the Particle-in-Cell method for plasma simulation
This paper presents experimental results of Particle-in-Cell plasma simulation on a hybrid system with CPUs and Intel Xeon Phi coprocessors. We consider simulation of two relevant laserdriven particle acceleration regimes using the Particle-in-Cell code PICADOR. On a node of a cluster with 2 CPUs and 2 Xeon Phi coprocessors the hybrid CPU + Xeon Phi configuration allows to fully utilize the computational resources of the node. It outperforms both CPU-only and Xeon Phi-only configurations with the speedups between 1.36 x and 1.68 x
Particle-in-Cell laser-plasma simulation on Xeon Phi coprocessors
This paper concerns the development of a high-performance implementation of the Particle-in-Cell method for plasma simulation on Intel Xeon Phi coprocessors. We discuss the suitability of the method for Xeon Phi architecture and present our experience in the porting and optimization of the existing parallel Particle-in-Cell code PICADOR. Direct porting without code modification gives performance on Xeon Phi close to that of an 8-core CPU on a benchmark problem with 50 particles per cell. We demonstrate step-by-step optimization techniques, such as improving data locality, enhancing parallelization efficiency and vectorization leading to an overall 4.2 x speedup on CPU and 7.5 x on Xeon Phi compared to the baseline version. The optimized version achieves 16.9 ns per particle update on an Intel Xeon E5-2660 CPU and 9.3 ns per particle update on an Intel Xeon Phi 5110P. For a real problem of laser ion acceleration in targets with surface grating, where a large number of macroparticles per cell is required, the speedup of Xeon Phi compared to CPU is 1.6x