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10 papers · 1 filter
A robust plasma-based laser amplifier via stimulated Brillouin scattering
Paulo Alves, Raoul Trines, Kathryn Humphrey +6
It is shown here that Brillouin amplification can be used to produce picosecond pulses of petawatt power. Brillouin amplification is far more resilient to fluctuations in the laser…
Modeling of Laser wakefield acceleration in Lorentz boosted frame using EM-PIC code with spectral solver
Peicheng Yu, Xinlu Xu, Viktor K. Decyk +7
Simulating laser wakefield acceleration (LWFA) in a Lorentz boosted frame in which the plasma drifts towards the laser with can speedup the simulation by factors of $γ^2_b=(1…
Exploiting multi-scale parallelism for large scale numerical modelling of laser wakefield accelerators
Ricardo A. Fonseca, Jorge Vieira, Frederico Fiúza +4
A new generation of laser wakefield accelerators, supported by the extreme accelerating fields generated in the interaction of PW-Class lasers and underdense targets, promises the…
The spherically symmetric Einstein-scalar field system with positive and vanishing cosmological constant: a comparison
João L. Costa
We review recent results concerning the spherically symmetric Einstein-scalar field system with positive cosmological constant. We do so by comparing with the classical results of…
Magnetic field generation and amplification in an expanding plasma
K. M. Schoeffler, N. F. Loureiro, R. A. Fonseca +1
Particle-in-cell simulations are used to investigate the formation of magnetic fields, B, in plasmas with perpendicular electron density and temperature gradients. For system sizes…
Key Phrase Extraction of Lightly Filtered Broadcast News
Luis Marujo, Ricardo Ribeiro, David Martins de Matos +3
This paper explores the impact of light filtering on automatic key phrase extraction (AKE) applied to Broadcast News (BN). Key phrases are words and expressions that best character…