scholarly journals Influence of laser polarization on collective electron dynamics in ultraintense laser–foil interactions

2016 ◽  
Vol 4 ◽  
Author(s):  
Bruno Gonzalez-Izquierdo ◽  
Ross J. Gray ◽  
Martin King ◽  
Robbie Wilson ◽  
Rachel J. Dance ◽  
...  
Keyword(s):  
Electron Beam ◽  
Laser Pulse ◽  
Laser Light ◽  
Major Axis ◽  
Target Thickness ◽  
Laser Polarization ◽  
Particle In Cell ◽  
Collective Response ◽  
Polarization Axis ◽  
Foil Target

The collective response of electrons in an ultrathin foil target irradiated by an ultraintense ( ${\sim}6\times 10^{20}~\text{W}~\text{cm}^{-2}$ ) laser pulse is investigated experimentally and via 3D particle-in-cell simulations. It is shown that if the target is sufficiently thin that the laser induces significant radiation pressure, but not thin enough to become relativistically transparent to the laser light, the resulting relativistic electron beam is elliptical, with the major axis of the ellipse directed along the laser polarization axis. When the target thickness is decreased such that it becomes relativistically transparent early in the interaction with the laser pulse, diffraction of the transmitted laser light occurs through a so called ‘relativistic plasma aperture’, inducing structure in the spatial-intensity profile of the beam of energetic electrons. It is shown that the electron beam profile can be modified by variation of the target thickness and degree of ellipticity in the laser polarization.

ENERGETIC PROTON ACCELERATION BY ULTRAINTENSE LASER PULSES IN INHOMOGENEOUS PLASMA TARGETS

2007 ◽  
Vol 21 (03n04) ◽  
pp. 642-646 ◽  
Author(s):  
A. ABUDUREXITI ◽  
Y. MIKADO ◽  
T. OKADA
Keyword(s):  
Laser Pulse ◽  
Inhomogeneous Plasma ◽  
Laser Pulses ◽  
Proton Acceleration ◽  
Particle In Cell ◽  
Target Plasma ◽  
Plasma Target ◽  
Experimental Process ◽  
Foil Target ◽  
Proton Bunch

Particle-in-Cell (PIC) simulations of fast particles produced by a short laser pulse with duration of 40 fs and an intensity of 1020W/cm2 interacting with a foil target are performed. The experimental process is numerically simulated by considering a triangular concave target illuminated by an ultraintense laser. We have demonstrated increased acceleration and higher proton energies for triangular concave targets. We also determined the optimum target plasma conditions for maximum proton acceleration. The results indicated that a change in the plasma target shape directly affects the degree of contraction accelerated proton bunch.

scholarly journals Laser-driven acceleration of heavy ions at ultra-relativistic laser intensity

2018 ◽  
Vol 36 (4) ◽  
pp. 507-512 ◽  
Author(s):  
J. Domański ◽  
J. Badziak ◽  
M. Marchwiany
Keyword(s):  
Laser Pulse ◽  
Heavy Ions ◽  
Ion Beam ◽  
Heavy Ion ◽  
High Energy ◽  
Target Thickness ◽  
High Energy Density ◽  
Ion Acceleration ◽  
Acceleration Process ◽  
Particle In Cell

AbstractThis paper presents the results of numerical investigations into the acceleration of heavy ions by a multi-PW laser pulse of ultra-relativistic intensity, to be available with the Extreme Light Infrastructure lasers currently being built in Europe. In the numerical simulations, performed with the use of a multi-dimensional (2D3V) particle-in-cell code, the thorium target with a thickness of 50 or 200 nm was irradiated by a circularly polarized 20 fs laser pulse with an energy of ~150 J and an intensity of 1023 W/cm2. It was found that the detailed run of the ion acceleration process depends on the target thickness, though in both considered cases the radiation pressure acceleration (RPA) stage of ion acceleration is followed by a sheath acceleration stage, with a significant role in the post-RPA stage being played by the ballistic movement of ions. This hybrid acceleration mechanism leads to the production of an ultra-short (sub-picosecond) multi-GeV ion beam with a wide energy spectrum and an extremely high intensity (>1021 W/cm2) and ion fluence (>1017 cm−2). Heavy ion beams of such extreme parameters are hardly achievable in conventional RF-driven ion accelerators, so they could open the avenues to new areas of research in nuclear and high energy density physics, and possibly in other scientific domains.

scholarly journals Evolution of a high-density electron beam in the field of a super-intense laser pulse

2008 ◽  
Vol 26 (3) ◽  
pp. 397-409 ◽  
Author(s):  
V.V. Kulagin ◽  
V.A. Cherepenin ◽  
M.S. Hur ◽  
J. Lee ◽  
H. Suk
Keyword(s):  
Electron Beam ◽  
Laser Pulse ◽  
Equations Of Motion ◽  
Thomson Scattering ◽  
High Density ◽  
Intense Laser ◽  
Low Density ◽  
Intense Laser Pulse ◽  
Particle In Cell ◽  
The One

AbstractThe evolution of a high-density electron beam in the field of a super-intense laser pulse is considered. The one-dimensional (1D) theory for the description of interaction, taking into account the space-charge forces of the beam, is developed, and exact solutions for the equations of motion of the electrons are found. It was shown that the length of the high-density electron beam increases slowly in time after initial compression of the beam by the laser pulse as opposed to the low-density electron beam case, where the length is constant on average. Also, for the high-density electron beam, the sharp peak frozen into the density distribution can appear in addition to a microbunching, which is characteristic for a low-density electron beam in a super-intense laser field. Characteristic parameters for the evolution of the electron beam are calculated by an example of a step-like envelope of the laser pulse. Comparison with 1D particle-in-cell simulations shows adequacy of the derived theory. The considered issue is very important for a special two-pulse realization of a Thomson scattering scheme, where one high-intensity laser pulse is used for acceleration, compression and microbunching of the electron beam, and the other probe counter-streaming laser pulse is used for scattering with frequency up-shifting and amplitude enhancement.

Laser polarization dependence of proton emission from a thin foil target irradiated by a 70fs, intense laser pulse

2005 ◽  
Vol 12 (10) ◽  
pp. 100701 ◽  
Author(s):  
A. Fukumi ◽  
M. Nishiuchi ◽  
H. Daido ◽  
Z. Li ◽  
A. Sagisaka ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Thin Foil ◽  
Polarization Dependence ◽  
Intense Laser ◽  
Proton Emission ◽  
Laser Polarization ◽  
Intense Laser Pulse ◽  
Foil Target

scholarly journals Numerical studies of acceleration of thorium ions by a laser pulse of ultra-relativistic intensity

2018 ◽  
Vol 167 ◽  
pp. 01004 ◽  
Author(s):  
Jaroslaw Domanski ◽  
Jan Badziak
Keyword(s):  
Laser Pulse ◽  
Nuclear Physics ◽  
Ion Beam ◽  
Target Thickness ◽  
Ion Beams ◽  
Particle In Cell ◽  
Numerical Studies ◽  
Fs Laser ◽  
Thorium Target ◽  
The Universe

One of the key scientific projects of ELI-Nuclear Physics is to study the production of extremely neutron-rich nuclides by a new reaction mechanism called fission-fusion using laser-accelerated thorium (232Th) ions. This research is of crucial importance for understanding the nature of the creation of heavy elements in the Universe; however, they require Th ion beams of very high beam fluencies and intensities which are inaccessible in conventional accelerators. This contribution is a first attempt to investigate the possibility of the generation of intense Th ion beams by a fs laser pulse of ultra-relativistic intensity. The investigation was performed with the use of fully electromagnetic relativistic particle-in-cell code. A sub-μm thorium target was irradiated by a circularly polarized 20-fs laser pulse of intensity up to 1023 W/cm2, predicted to be attainable at ELI-NP. At the laser intensity ~ 1023 W/cm2 and an optimum target thickness, the maximum energies of Th ions approach 9.3 GeV, the ion beam intensity is > 1020 W/cm2 and the total ion fluence reaches values ~ 1019 ions/cm2. The last two values are much higher than attainable in conventional accelerators and are fairly promising for the planned ELI-NP experiment.

Electromagnetic-wave-pumped free-electron laser in a plasma channel

1997 ◽  
Vol 58 (4) ◽  
pp. 613-621 ◽  
Author(s):  
JETENDRA PARASHAR ◽  
H. D. PANDEY ◽  
A. K. SHARMA ◽  
V. K. TRIPATHI
Keyword(s):  
Electron Beam ◽  
Electromagnetic Wave ◽  
Laser Radiation ◽  
Laser Pulse ◽  
Free Electron Laser ◽  
Relativistic Electron Beam ◽  
Plasma Channel ◽  
Beam Quality ◽  
Coherent Radiation ◽  
Millimetre Wave

An intense short laser pulse or a millimetre wave propagating through a plasma channel may act as a wiggler for the generation of shorter wavelengths. When a relativistic electron beam is launched into the channel from the opposite direction, the laser radiation is Compton/Raman backscattered to produce coherent radiation at shorter wavelengths. The scheme, however, requires a superior beam quality with energy spread less than 1% in the Raman regime.

Generation of a quasimonoenergetic electron beam using a single laser pulse

Laser Physics ◽  
2006 ◽  
Vol 16 (7) ◽  
pp. 1107-1110 ◽  
Author(s):  
H. Kotaki ◽  
A. Yamazaki ◽  
I. Daito ◽  
M. Kando ◽  
S. V. Bulanov ◽  
...  
Keyword(s):  
Electron Beam ◽  
Laser Pulse ◽  
Single Laser Pulse ◽  
Single Laser

Design Sheet Beam Gun for THz Traveling-Wave Tube

2014 ◽  
Vol 541-542 ◽  
pp. 470-473 ◽  
Author(s):  
Zhan Liang Wang ◽  
Yu Bin Gong ◽  
Hua Rong Gong ◽  
Jin Jun Feng ◽  
Xiong Xu
Keyword(s):  
Electron Beam ◽  
Traveling Wave ◽  
Design Method ◽  
Terahertz Wave ◽  
Wave Radiation ◽  
Traveling Wave Tube ◽  
Wave Tube ◽  
Electron Device ◽  
Particle In Cell ◽  
Sheet Electron Beam

The Sheet Electron Beam Vacuum Electron Device is an Attractive Choice for Generating High Power Millimeter/terahertz Wave Radiation. the Sheet Electron Beam Gun is a Key Component for the Sheet Beam Vacuum Electron Device. in this Paper, a Novel Sheet Electron Beam Gun was Proposed for a Terahertz Traveling-Wave Tube. the Theories of Sheet Beam Gun are Deduced Based on the Round Beam Gun Theories. the Track of 24.5kV, 1A, 0.4mm8mm Sheet Beam is Gained through 3D Particle-in-Cell Simulation and the Theories are Verified. the Investigation Results Show that, the Design Method of the Sheet Beam Gun is Easy and Reliable.

scholarly journals Brief Communication: The double layer in the separatrix region during magnetic reconnection

2015 ◽  
Vol 22 (2) ◽  
pp. 167-171
Author(s):  
J. Guo ◽  
B. Yu
Keyword(s):  
Electron Beam ◽  
Magnetic Reconnection ◽  
Double Layer ◽  
Particle In Cell ◽  
Acoustic Instability ◽  
Ion Acoustic ◽  
Evolution Stage ◽  
Spatial Size ◽  
Electron Holes ◽  
Observation Results

Abstract. With two-dimensional (2-D) particle-in-cell (PIC) simulations we investigate the evolution of the double layer (DL) driven by magnetic reconnection. Our results show that an electron beam can be generated in the separatrix region as magnetic reconnection proceeds. This electron beam could trigger the ion-acoustic instability; as a result, a DL accompanied with electron holes (EHs) can be found during the nonlinear evolution stage of this instability. The spatial size of the DL is about 10 Debye lengths. This DL propagates along the magnetic field at a velocity of about the ion-acoustic speed, which is consistent with the observation results.

Transient Light Emissions from a Laser Perturbed Plasma

1972 ◽  
Vol 50 (19) ◽  
pp. 2338-2347 ◽  
Author(s):  
H. A. Baldis ◽  
R. A. Nodwell ◽  
J. Meyer
Keyword(s):  
Laser Pulse ◽  
Electron Density ◽  
Laser Light ◽  
Line Emission ◽  
Argon Plasma ◽  
Stark Broadening ◽  
Excited Atoms ◽  
Electron Density Gradient ◽  
Transient Plasma ◽  
The Continuum

The interaction between a 20 MW Q-switched ruby laser pulse and a partially ionized argon plasma has been studied experimentally. When the focused laser pulse is fired into the plasma, a transient emission from the plasma may be observed both in the continuum and line emission. From measurements of the absolute intensities of this transient radiation, estimates have been made of the population density of the excited atoms and of the electron densities. The Stark broadening of the Ar II lines has also been measured to obtain the electron density in the transient plasma and data obtained in this way are consistent with those obtained from the continuum radiation. During the time when the laser light is incident on the plasma the Ar II lines show a strong asymmetry which disappears quickly after the laser pulse has terminated. This asymmetry can be explained in terms of the electron density gradient present in the expanding perturbed plasma.

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