scholarly journals Spontaneous emergence of non-planar electron orbits during direct laser acceleration by a linearly polarized laser pulse

2016 ◽  
Vol 23 (2) ◽  
pp. 023111 ◽  
Author(s):  
A. V. Arefiev ◽  
V. N. Khudik ◽  
A. P. L. Robinson ◽  
G. Shvets ◽  
L. Willingale
Keyword(s):  
Laser Pulse ◽  
Direct Laser ◽  
Linearly Polarized ◽  
Laser Acceleration ◽  
Planar Electron

Hamiltonian formulation of direct laser acceleration in vacuum

2007 ◽  
Vol 73 (5) ◽  
pp. 635-647 ◽  
Author(s):  
M. ELOY ◽  
A. GUERREIRO ◽  
J. T. MENDONÇA ◽  
R. BINGHAM
Keyword(s):  
Laser Pulse ◽  
Hamiltonian Formulation ◽  
Particle Energy ◽  
Low Intensity ◽  
Hamiltonian Theory ◽  
Direct Laser ◽  
Laser Acceleration ◽  
Exact Shape ◽  
Energy Gains ◽  
New Formulation

AbstractWe present a new formulation for the direct laser acceleration of electrons in vacuum based on the Hamiltonian theory. Two different regimes for the snow-plowed, accelerated electrons are identified and characterized, the first pertaining to high-intensity and the second to low-intensity pulses, both leading to efficient electron acceleration. Particle energy yields are shown to be independent of the exact shape of the laser pulse and energy gains are estimated.

scholarly journals Novel aspects of direct laser acceleration of relativistic electrons

2015 ◽  
Vol 81 (4) ◽  
Author(s):  
A. V. Arefiev ◽  
A. P. L. Robinson ◽  
V. N. Khudik
Keyword(s):  
Laser Pulse ◽  
Electric Field ◽  
Electron Energy ◽  
Electric Fields ◽  
Energy Gain ◽  
Relativistic Electrons ◽  
Extra Energy ◽  
Direct Laser ◽  
Laser Acceleration ◽  
The Impact

We examine the impact of several factors on electron acceleration by a laser pulse and the resulting electron energy gain. Specifically, we consider the role played by: (1) static longitudinal electric field, (2) static transverse electric field, (3) electron injection into the laser pulse, and (4) static longitudinal magnetic field. It is shown that all of these factors lead, under certain conditions, to a considerable electron energy gain from the laser pulse. In contrast with other mechanisms such as wakefield acceleration, the static electric fields in this case do not directly transfer substantial energy to the electron. Instead, they reduce the longitudinal dephasing between the electron and the laser beam, which then allows the electron to gain extra energy from the beam. The mechanisms discussed here are relevant to experiments with under-dense gas jets, as well as to experiments with solid-density targets involving an extended pre-plasma.

scholarly journals Enhanced laser ion acceleration with a multi-layer foam target assembly

2014 ◽  
Vol 32 (4) ◽  
pp. 509-515 ◽  
Author(s):  
E. Yazdani ◽  
R. Sadighi-Bonabi ◽  
H. Afarideh ◽  
J. Yazdanpanah ◽  
H. Hora
Keyword(s):  
Proton Energy ◽  
Critical Density ◽  
Maximum Energy ◽  
Longitudinal Momentum ◽  
Free Electrons ◽  
Particle In Cell ◽  
Direct Laser ◽  
Linearly Polarized ◽  
Cell Simulation ◽  
Laser Acceleration

AbstractInteraction of a linearly polarized Gaussian laser pulse (at relativistic intensity of 2.0 × 1020 Wcm−2) with a multi-layer foam (as a near critical density target) attached to a solid layer is investigated by using two-dimensional particle-in-cell simulation. It is found that electrons with longitudinal momentum exceeding the free electrons limit of meca02/2 so-called super-hot electrons can be produced when the direct laser acceleration regime is fulfilled and benefited from self-focusing inside of the subcritical plasma. These electrons penetrate easily through the target and can enhance greatly the sheath field at the rear, resulting in a significant increase in the maximum energy of protons in target normal sheath acceleration regime. The results indicate that the maximum proton energy is enhanced by 2.7 times via using an assembled target arrangement compared to a bare solid target. Furthermore, by demonstration of this assembly, the maximum proton energy is improved beyond the optimum amount achieved by a two-layer target proposed by Sgattoni et al. (2012).

scholarly journals Cylindrically and non-cylindrically symmetric expansion dynamics of tin microdroplets after ultrashort laser pulse impact

2021 ◽  
Vol 127 (2) ◽  
Author(s):  
Tiago de Faria Pinto ◽  
Jan Mathijssen ◽  
Randy Meijer ◽  
Hao Zhang ◽  
Alex Bayerle ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Droplet Deformation ◽  
Cylindrically Symmetric ◽  
Linearly Polarized ◽  
Particle Hydrodynamics ◽  
Deformation Dynamics ◽  
Smoothed Particle ◽  
Asymmetric Shock

AbstractIn this work, the expansion dynamics of liquid tin micro-droplets irradiated by femtosecond laser pulses were investigated. The effects of laser pulse duration, energy, and polarization on ablation, cavitation, and spallation dynamics were studied using laser pulse durations ranging from 220 fs to 10 ps, with energies ranging from 1 to 5 mJ, for micro-droplets with an initial radius of 15 and 23 $$\upmu$$ μ m. Using linearly polarized laser pulses, cylindrically asymmetric shock waves were produced, leading to novel non-symmetric target shapes, the asymmetry of which was studied as a function of laser pulse parameters and droplet size. A good qualitative agreement was obtained between smoothed-particle hydrodynamics simulations and high-resolution stroboscopic experimental data of the droplet deformation dynamics.

scholarly journals Electron energy spectrum produced by stochastic acceleration in the laser–plasma interaction

2017 ◽  
Vol 35 (2) ◽  
pp. 265-273 ◽  
Author(s):  
E. Khalilzadeh ◽  
A. Chakhmachi ◽  
J. Yazdanpanah
Keyword(s):  
Energy Spectrum ◽  
Laser Pulse ◽  
Rise Time ◽  
Wave Breaking ◽  
Boundary Effect ◽  
Maximum Energy ◽  
Intense Laser ◽  
Stochastic Acceleration ◽  
Direct Laser ◽  
Short Rise Time

AbstractIn this paper, the electrons energy spectrum produced by stochastic acceleration in the interaction of an intense laser pulse with the underdense plasma is described by employing the fully kinetic 1D-3 V particle-in-cell simulation. In this way, two finite laser pulses with the same length 200 fs and with two different rise times 30 and 60 fs are typically selected. It is shown that the maximum energy of electrons in the laser pulse with the short rise time (30 fs) is about eight times greater than the maximum energy of the electrons with the long rise time (60 fs). Furthermore, unlike the pulse with the short rise time, the shape of energy spectrum and the electrons temperature in the long rise time laser pulse are approximately unchanged over the time. These results originated from the fact that in the case of long rise time laser pulse, all electrons are accelerated by the one chaotic mechanism because of the scattered fields generated in the plasma, but in the case of short rise time laser pulse, three different mechanisms accelerate the electrons: first, the stochastic acceleration because of the nonlinear wave breaking via plasma-vacuum boundary effect; second, the stochastic acceleration initiated by the wave breaking; and third, the direct laser acceleration of the released electrons.

scholarly journals Fabrication and Characterization of Woodpile Structures for Direct Laser Acceleration

2010 ◽  
Author(s):  
C. McGuinness ◽  
E. Colby ◽  
B. Cowan ◽  
R. J. England ◽  
J. Ng ◽  
...  
Keyword(s):  
Direct Laser ◽  
Laser Acceleration ◽  
Fabrication And Characterization

scholarly journals CONTROL OF CHARACTERISTICS OF SELF-INJECTED AND ACCELERATED ELECTRON BUNCH IN PLASMA BY LASER PULSE SHAPING ON RADIUS, INTENSITY AND SHAPE

2019 ◽  
pp. 39-42
Author(s):  
V.I. Maslov ◽  
D.S. Bondar ◽  
V. Grigorencko ◽  
I.P. Levchuk ◽  
I.N. Onishchenko
Keyword(s):  
Laser Pulse ◽  
Pulse Shaping ◽  
Electron Bunch ◽  
The Self ◽  
Energy Spread ◽  
Small Energy ◽  
Laser Acceleration ◽  
Laser Pulse Shaping ◽  
Plasma Wakefield

At the laser acceleration of self-injected electron bunch by plasma wakefield it is important to form bunch with small energy spread and small size. It has been shown that laser-pulse shaping on radius, intensity and shape controls characteristics of the self-injected electron bunch and provides at certain shaping small energy spread and small size of self-injected and accelerated electron bunch.

Design, fabrication, and testing of a fused-silica dual-layer grating structure for direct laser acceleration of electrons

2013 ◽  
Author(s):  
E. A. Peralta ◽  
E. Colby ◽  
R. J. England ◽  
C. McGuinness ◽  
B. Montazeri ◽  
...  
Keyword(s):  
Fused Silica ◽  
Grating Structure ◽  
Direct Laser ◽  
Laser Acceleration
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