Effect of Multiple Scattering on the Critical Density of the Energy of the PETN - Aluminium Compound Initiated by a Neodymium Laser Pulse

2017 ◽  
Keyword(s):  
Laser Pulse ◽  
Multiple Scattering ◽  
Critical Density ◽  
Neodymium Laser ◽  
Aluminium Compound

scholarly journals Intense local plasma heating by stopping of ultrashort ultraintense laser pulse in dense plasma

2007 ◽  
Vol 25 (4) ◽  
pp. 631-638 ◽  
Author(s):  
W. Yu ◽  
M. Y. Yu ◽  
H. Xu ◽  
Y. W. Tian ◽  
J. Chen ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Plasma Oscillation ◽  
Plasma Heating ◽  
Critical Density ◽  
Deposition Process ◽  
Particle In Cell ◽  
Linearly Polarized ◽  
Plasma Slab ◽  
Cell Simulation ◽  
Channel Boundary

AbstractSelf-trapping, stopping, and absorption of an ultrashort ultraintense linearly polarized laser pulse in a finite plasma slab of near-critical density is investigated by particle-in-cell simulation. As in the underdense plasma, an electron cavity is created by the pressure of the transmitted part of the light pulse and it traps the latter. Since the background plasma is at near-critical density, no wake plasma oscillation is created. The propagating self-trapped light rapidly comes to a stop inside the slab. Subsequent ion Coulomb explosion of the stopped cavity leads to explosive expulsion of its ions and formation of an extended channel having extremely low plasma density. The energetic Coulomb-exploded ions form shock layers of high density and temperature at the channel boundary. In contrast to a propagating pulse in a lower density plasma, here the energy of the trapped light is deposited onto a stationary and highly localized region of the plasma. This highly localized energy-deposition process can be relevant to the fast ignition scheme of inertial fusion.

scholarly journals Modeling multiple scattering transient of an ultrashort laser pulse by spherical particles

2022 ◽  
pp. 110696
Author(s):  
Geoffroy Chaussonnet ◽  
Loïc Mees ◽  
Miloš Šormaz ◽  
Patrick Jenny ◽  
Philippe M. Bardet
Keyword(s):  
Laser Pulse ◽  
Multiple Scattering ◽  
Ultrashort Laser Pulse ◽  
Spherical Particles ◽  
Ultrashort Laser

Enhancement of brightness of high-order harmonics with elliptical polarization from near-critical density plasmas irradiated by an ultraintense laser pulse

2020 ◽  
Vol 27 (8) ◽  
pp. 083101
Author(s):  
Yan Jiang ◽  
Qing Wang ◽  
Lihua Cao ◽  
Zhanjun Liu ◽  
Chunyang Zheng ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Critical Density ◽  
High Order ◽  
Elliptical Polarization

scholarly journals Proton acceleration in a laser-induced relativistic electron vortex

2019 ◽  
Vol 85 (4) ◽  
Author(s):  
L. Q. Yi ◽  
I. Pusztai ◽  
A. Pukhov ◽  
B. F. Shen ◽  
T. Fülöp
Keyword(s):  
Laser Pulse ◽  
Relativistic Electron ◽  
Density Gradient ◽  
Incidence Angle ◽  
Grazing Angle ◽  
Critical Density ◽  
Intense Laser ◽  
Plasma Parameters ◽  
Analytical Estimate ◽  
Background Density

We show that when a solid plasma foil with a density gradient on the front surface is irradiated by an intense laser pulse at a grazing angle, ${\sim}80^{\circ }$ , a relativistic electron vortex is excited in the near-critical-density layer after the laser pulse depletion. The vortex structure and dynamics are studied using particle-in-cell simulations. Due to the asymmetry introduced by non-uniform background density, the vortex drifts at a constant velocity, typically $0.2{-}0.3$ times the speed of light. The strong magnetic field inside the vortex leads to significant charge separation; in the corresponding electric field initially stationary protons can be captured and accelerated to twice the velocity of the vortex (100–200 MeV). A representative scenario – with laser intensity of $10^{21}~\text{W}~\text{cm}^{-2}$ – is discussed: two-dimensional simulations suggest that a quasi-monoenergetic proton beam can be obtained with a mean energy 140 MeV and an energy spread of ${\sim}10\,\%$ . We derive an analytical estimate for the vortex velocity in terms of laser and plasma parameters, demonstrating that the maximum proton energy can be controlled by the incidence angle of the laser and the plasma density gradient.

scholarly journals Time evolution of stimulated Raman scattering and two-plasmon decay at laser intensities relevant for shock ignition in a hot plasma

2019 ◽  
Vol 7 ◽  
Author(s):  
G. Cristoforetti ◽  
L. Antonelli ◽  
D. Mancelli ◽  
S. Atzeni ◽  
F. Baffigi ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Raman Scattering ◽  
Inertial Confinement Fusion ◽  
Stimulated Raman Scattering ◽  
Critical Density ◽  
Time History ◽  
High Energy ◽  
Experimental Results ◽  
Stimulated Raman ◽  
Shock Ignition

Laser–plasma interaction (LPI) at intensities $10^{15}{-}10^{16}~\text{W}\cdot \text{cm}^{-2}$ is dominated by parametric instabilities which can be responsible for a significant amount of non-collisional absorption and generate large fluxes of high-energy nonthermal electrons. Such a regime is of paramount importance for inertial confinement fusion (ICF) and in particular for the shock ignition scheme. In this paper we report on an experiment carried out at the Prague Asterix Laser System (PALS) facility to investigate the extent and time history of stimulated Raman scattering (SRS) and two-plasmon decay (TPD) instabilities, driven by the interaction of an infrared laser pulse at an intensity ${\sim}1.2\times 10^{16}~\text{W}\cdot \text{cm}^{-2}$ with a ${\sim}100~\unicode[STIX]{x03BC}\text{m}$ scalelength plasma produced from irradiation of a flat plastic target. The laser pulse duration (300 ps) and the high value of plasma temperature ( ${\sim}4~\text{keV}$ ) expected from hydrodynamic simulations make these results interesting for a deeper understanding of LPI in shock ignition conditions. Experimental results show that absolute TPD/SRS, driven at a quarter of the critical density, and convective SRS, driven at lower plasma densities, are well separated in time, with absolute instabilities driven at early times of interaction and convective backward SRS emerging at the laser peak and persisting all over the tail of the pulse. Side-scattering SRS, driven at low plasma densities, is also clearly observed. Experimental results are compared to fully kinetic large-scale, two-dimensional simulations. Particle-in-cell results, beyond reproducing the framework delineated by the experimental measurements, reveal the importance of filamentation instability in ruling the onset of SRS and stimulated Brillouin scattering instabilities and confirm the crucial role of collisionless absorption in the LPI energy balance.

Intense single attosecond pulse generation from near-critical-density plasmas irradiated by a few-cycle laser pulse

2018 ◽  
Vol 25 (2) ◽  
pp. 023302 ◽  
Author(s):  
Y. X. Zhang ◽  
B. Qiao ◽  
X. R. Xu ◽  
H. X. Chang ◽  
M. Y. Yu ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Critical Density ◽  
Pulse Generation ◽  
Attosecond Pulse ◽  
Attosecond Pulse Generation

Ultrabright γ-ray emission from the interaction of an intense laser pulse with a near-critical-density plasma

2021 ◽  
Author(s):  
Aynisa Tursun ◽  
Mamat Ali Bake ◽  
Baisong Xie ◽  
Yasheng Niyazi ◽  
Abuduresuli Abudurexiti
Keyword(s):  
Laser Pulse ◽  
Critical Density ◽  
Intense Laser ◽  
Intense Laser Pulse ◽  
Γ Ray ◽  
Density Plasma
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