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 Numerical simulations of generation of high-energy ion beams driven by a petawatt femtosecond laser

Nukleonika ◽  
2015 ◽  
Vol 60 (2) ◽  
pp. 229-232
Author(s):  
Jarosław Domański ◽  
Jan Badziak ◽  
Sławomir Jabłoński
Keyword(s):  
Laser Pulse ◽  
Mass Density ◽  
Ion Beam ◽  
High Energy ◽  
Particle In Cell ◽  
Ion Energies ◽  
Linearly Polarized ◽  
Order Of Magnitude ◽  
Cell Simulation ◽  
Pulse Polarization

Abstract This contribution presents results of a Particle-in-Cell simulation of ion beam acceleration via the interaction of a petawatt 25 fs laser pulse of high intensity (up to ~1021 W/cm2) with thin hydrocarbon (CH) and erbium hydride (ErH3) targets of equal areal mass density (of 0.6 g/m2). A special attention is paid to the effect that the laser pulse polarization and the material composition of the target have on the maximum ion energies and the number of high energy (>10 MeV) protons. It is shown that both the mean and the maximum ion energies are higher for the linear polarization than for the circular one. A comparison of the maximum proton energies and the total number of protons generated from the CH and ErH3 targets using a linearly polarized beam is presented. For the ErH3 targets the maximum proton energies are higher and they reach 50 MeV for the laser pulse intensity of 1021 W/cm2. The number of protons with energies higher than 10 MeV is an order of magnitude higher for the ErH3 targets than that for the CH targets.

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).

Post-solitons and electron vortices generated by femtosecond intense laser interacting with uniform near-critical-density plasmas

2021 ◽  
Author(s):  
Dong-Ning Yue ◽  
Min Chen ◽  
Yao Zhao ◽  
Pan-Fei Geng ◽  
Xiao-Hui Yuan ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Critical Density ◽  
Laser Pulses ◽  
Intense Laser ◽  
Nonlinear Structures ◽  
Particle In Cell ◽  
Laser Propagation ◽  
Laser Driver ◽  
Linearly Polarized ◽  
Dimensional Simulation

Abstract Generation of nonlinear structures, such as stimulated Raman side scattering waves, post-solitons and electron vortices, during ultra-short intense laser pulse transportation in near-critical-density (NCD) plasmas are studied by using multi-dimensional particle-in-cell (PIC) simulations. In two-dimensional geometries, both P- and S- polarized laser pulses are used to drive these nonlinear structures and to check the polarization effects on them. In the S-polarized case, the scattered waves can be captured by surrounding plasmas leading to the generation of post-solitons, while the main pulse excites convective electric currents leading to the formation of electron vortices through Kelvin-Helmholtz instability (KHI). In the P-polarized case, the scattered waves dissipate their energy by heating surrounding plasmas. Electron vortices are excited due to the hosing instability of the drive laser. These polarization dependent physical processes are reproduced in two different planes perpendicular to the laser propagation direction in three-dimensional simulation with linearly polarized laser driver. The current work provides inspiration for future experiments of laser-NCD plasma interactions.

scholarly journals Stochastic plasma heating by electrostatic waves: a comparison between a particle-in-cell simulation and a laboratory experiment

1993 ◽  
Vol 182 (4-6) ◽  
pp. 426-432 ◽  
Author(s):  
M. Fivaz ◽  
A. Fasoli ◽  
K. Appert ◽  
F. Skiff ◽  
T.M. Tran ◽  
...  
Keyword(s):  
Laboratory Experiment ◽  
Plasma Heating ◽  
Electrostatic Waves ◽  
Particle In Cell ◽  
Cell Simulation

scholarly journals Wakefield generation and electron acceleration by intense super-Gaussian laser pulses propagating in plasma

2013 ◽  
Vol 31 (4) ◽  
pp. 583-588 ◽  
Author(s):  
Pallavi Jha ◽  
Akanksha Saroch ◽  
Rohit Kumar Mishra
Keyword(s):  
Laser Pulse ◽  
Laser Pulses ◽  
Gaussian Pulse ◽  
Simulation Studies ◽  
One Dimensional ◽  
Particle In Cell ◽  
Peak Energy ◽  
Test Electron ◽  
Linearly Polarized ◽  
Relativistic Regime

AbstractEvolution of longitudinal electrostatic wakefields, due to the propagation of a linearly polarized super-Gaussian laser pulse through homogeneous plasma has been presented via two-dimensional particle-in-cell simulations. The wakes generated are compared with those generated by a Gaussian laser pulse in the relativistic regime. Further, one-dimensional numerical model has been used to validate the generated wakefields via simulation studies. Separatrix curves are plotted to study the trapping and energy gain of an externally injected test electron, due to the generated electrostatic wakefields. An enhancement in the peak energy of an externally injected electron accelerated by wakes generated by super-Gaussian pulse as compared to Gaussian pulse case has been observed.

scholarly journals Effective laser driven proton acceleration from near critical density hydrogen plasma

2016 ◽  
Vol 34 (2) ◽  
pp. 219-229 ◽  
Author(s):  
Ashutosh Sharma ◽  
Alexander Andreev
Keyword(s):  
Laser Pulse ◽  
Hydrogen Plasma ◽  
Three Dimensional ◽  
Critical Density ◽  
High Energy ◽  
Intense Laser ◽  
Proton Density ◽  
Proton Acceleration ◽  
Pic Simulation ◽  
Particle In Cell

AbstractRecent advances in the production of high repetition, high power, and short laser pulse have enabled the generation of high-energy proton beam, required for technology and other medical applications. Here we demonstrate the effective laser driven proton acceleration from near-critical density hydrogen plasma by employing the short and intense laser pulse through three-dimensional (3D) particle-in-cell (PIC) simulation. The generation of strong magnetic field is demonstrated by numerical results and scaled with the plasma density and the electric field of laser. 3D PIC simulation results show the ring shaped proton density distribution where the protons are accelerated along the laser axis with fairly low divergence accompanied by off-axis beam of ring-like shape.

scholarly journals Enhanced ion acceleration by collisionless electrostatic shock in thin foils irradiated by ultraintense laser pulse

2009 ◽  
Vol 27 (2) ◽  
pp. 327-333 ◽  
Author(s):  
M.-P. Liu ◽  
B.-S. Xie ◽  
Y.-S. Huang ◽  
J. Liu ◽  
M.Y. Yu
Keyword(s):  
Laser Pulse ◽  
Target Surface ◽  
Hot Electrons ◽  
Intense Laser ◽  
Ion Acceleration ◽  
Particle In Cell ◽  
Thin Foils ◽  
Spatially Extended ◽  
Cell Simulation ◽  
Induced Transparency

AbstractThe formation of collisionless electrostatic shock (CES) and ion acceleration in thin foils irradiated by intense laser pulse is investigated using particle-in-cell simulation. The CES can appear in the expanding plasma behind the foil when self-induced transparency occurs. The transmitting laser pulse can expel target-interior electrons, in addition to the electrons from the front target surface. The additional hot electrons lead to an enhanced and spatially-extended sheath field behind the foil. As the CES propagates in the plasma, it also continuously forward-reflects many of the upstream ions to higher energies. The latter ions are further accelerated by the enhanced sheath field and can overtake and shield the target-normal sheath accelerated ions. The energy gain of the CES accelerated ions can thus be considerably higher than that of the latter.

scholarly journals Trapping of electromagnetic radiation in self-generated and preformed cavities

2013 ◽  
Vol 31 (4) ◽  
pp. 589-595 ◽  
Author(s):  
Shixia Luan ◽  
Wei Yu ◽  
Jingwei Wang ◽  
Mingyang Yu ◽  
Suming Weng ◽  
...  
Keyword(s):  
Laser Light ◽  
Ponderomotive Force ◽  
Light Trapping ◽  
Critical Density ◽  
Half Cycle ◽  
Particle In Cell ◽  
Peak Structure ◽  
Cell Simulation ◽  
Overdense Plasma ◽  
Vacuum Cavity

AbstractLaser light trapping in cavities in near-critical density plasmas is studied by two-dimensional particle-in-cell simulation. The laser ponderomotive force can create in the plasma a vacuum cavity bounded by a thin overcritical-density wall. The laser light is self-consistently trapped as a half-cycle electromagnetic wave in the form of an oscillon-caviton structure until it is slowly depleted through interaction with the cavity wall. When the near-critical density plasma contains a preformed cavity, laser light can become a standing wave in the latter. The trapped light is characterized as multi-peak structure. The overdense plasma wall around the self-generated and preformed cavities induced by the laser ponderomotive force is found to be crucial for pulse trapping. Once this wall forms, the trapped pulse can hardly penetrate.

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