scholarly journals All-optical acceleration in the laser wakefield

2018 ◽  
Vol 6 ◽  
Author(s):  
F. Zhang ◽  
Z. G. Deng ◽  
L. Q. Shan ◽  
Z. M. Zhang ◽  
B. Bi ◽  
...  
Keyword(s):  
Short Pulse ◽  
Low Cost ◽  
Maximum Energy ◽  
Initial Energy ◽  
Maximum Acceleration ◽  
Particle In Cell ◽  
Short Pulse Laser ◽  
Broad Energy Range ◽  
All Optical ◽  
Laser Wakefield

Muons produced by the Bethe–Heitler process from laser wakefield accelerated electrons interacting with high $Z$ materials have velocities close to the laser wakefield. It is possible to accelerate those muons with laser wakefield directly. Therefore for the first time we propose an all-optical ‘Generator and Booster’ scheme to accelerate the produced muons by another laser wakefield to supply a prompt, compact, low cost and controllable muon source in laser laboratories. The trapping and acceleration of muons are analyzed by one-dimensional analytic model and verified by two-dimensional particle-in-cell (PIC) simulation. It is shown that muons can be trapped in a broad energy range and accelerated to higher energy than that of electrons for longer dephasing length. We further extrapolate the dependence of the maximum acceleration energy of muons with the laser wakefield relativistic factor $\unicode[STIX]{x1D6FE}$ and the relevant initial energy $E_{0}$. It is shown that a maximum energy up to 15.2 GeV is promising with $\unicode[STIX]{x1D6FE}=46$ and $E_{0}=1.45~\text{GeV}$ on the existing short pulse laser facilities.

scholarly journals Laser driven electron acceleration in a CNT embedded gas jet target

2014 ◽  
Vol 32 (3) ◽  
pp. 495-500 ◽  
Author(s):  
Ashok Kumar ◽  
Deepak Dahiya ◽  
V. K. Tripathi
Keyword(s):  
Dense Plasma ◽  
Short Pulse ◽  
Analytical Framework ◽  
Energy Spread ◽  
Particle In Cell ◽  
Short Pulse Laser ◽  
Gain Energy ◽  
Bubble Regime ◽  
Underdense Plasma ◽  
Accelerated Charge

AbstractThe bubble regime acceleration of electrons by a short pulse laser in a carbon nanotube (CNT) embedded plasma is investigated, employing two-dimensional Particle-in-Cell simulations. The laser converts the CNT placed on the laser axis into dense plasma and expels the electrons out, to form a co-moving positive charged sheet inside the bubble. The additional field generated due to sheet enhances the energy of the monoenergetic bunch by about 5% and their number by 5–20%. For a typical 40 fs, 7.5 × 1019 Wcm−2 pulse in an underdense plasma of density n0, CNT of thickness 25 nm and electron density 30n0, produces a monoenergetic bunch of 115 MeV with 5% energy spread. When CNT density is raised to 90n0, the energy gain, energy spread and accelerated charge increases further. The analytical framework supports these features.

scholarly journals Direct observation of imploded core heating via fast electrons with super-penetration scheme

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
T. Gong ◽  
H. Habara ◽  
K. Sumioka ◽  
M. Yoshimoto ◽  
Y. Hayashi ◽  
...  
Keyword(s):  
Electron Beam ◽  
Direct Observation ◽  
Inertial Confinement Fusion ◽  
Short Pulse ◽  
Coupling Efficiency ◽  
High Energy ◽  
Inertial Confinement ◽  
Particle In Cell ◽  
Short Pulse Laser ◽  
Confinement Fusion

AbstractFast ignition (FI) is a promising approach for high-energy-gain inertial confinement fusion in the laboratory. To achieve ignition, the energy of a short-pulse laser is required to be delivered efficiently to the pre-compressed fuel core via a high-energy electron beam. Therefore, understanding the transport and energy deposition of this electron beam inside the pre-compressed core is the key for FI. Here we report on the direct observation of the electron beam transport and deposition in a compressed core through the stimulated Cu Kα emission in the super-penetration scheme. Simulations reproducing the experimental measurements indicate that, at the time of peak compression, about 1% of the short-pulse energy is coupled to a relatively low-density core with a radius of 70 μm. Analysis with the support of 2D particle-in-cell simulations uncovers the key factors improving this coupling efficiency. Our findings are of critical importance for optimizing FI experiments in a super-penetration scheme.

scholarly journals A new method on diagnostics of muons produced by a short pulse laser

2017 ◽  
Vol 5 ◽  
Author(s):  
Feng Zhang ◽  
Boyuan Li ◽  
Lianqiang Shan ◽  
Bo Zhang ◽  
Wei Hong ◽  
...  
Keyword(s):  
Pulse Laser ◽  
Short Pulse ◽  
Detection System ◽  
Low Cost ◽  
High Energy ◽  
Radiation Background ◽  
Short Pulse Duration ◽  
Short Pulse Laser ◽  
Muon Lifetime ◽  
Scintillator Detector

Muons produced by a short pulse laser can serve as a new type of muon source having potential advantages of high intensity, small source emittance, short pulse duration and low cost. To validate it in experiments, a suitable muon diagnostics system is needed since high muon flux generated by a short pulse laser shot is always accompanied by high radiation background, which is quite different from cases in general muon researches. A detection system is proposed to distinguish muon signals from radiation background by measuring the muon lifetime. It is based on the scintillator detector with water and lead shields, in which water is used to adjust energies of muons stopped in the scintillator and lead to against radiation background. A Geant4 simulation on the performance of the detection system shows that efficiency up to 52% could be arrived for low-energy muons around 200 MeV and this efficiency decreases to 14% for high-energy muons above 1000 MeV. The simulation also shows that the muon lifetime can be derived properly by measuring attenuation of the scintilla light of electrons from muon decays inside the scintillator detector.

scholarly journals Fast collisional electron heating and relaxation in thin foils driven by a circularly polarized ultraintense short-pulse laser

2020 ◽  
Vol 86 (2) ◽  
Author(s):  
Andréas Sundström ◽  
Laurent Gremillet ◽  
Evangelos Siminos ◽  
István Pusztai
Keyword(s):  
Laser Pulse ◽  
Short Pulse ◽  
Dense Matter ◽  
Absorption Mechanism ◽  
Circularly Polarized ◽  
Particle In Cell ◽  
Copper Target ◽  
Short Pulse Laser ◽  
Bulk Heating ◽  
Thin Foils

The creation of well-thermalized, hot and dense plasmas is attractive for warm dense matter studies. We investigate collisionally induced energy absorption of an ultraintense and ultrashort laser pulse in a solid copper target using particle-in-cell simulations. We find that, upon irradiation by a $2\times 10^{20}~\text{W}\,\text{cm}^{-2}$ intensity, 60 fs duration, circularly polarized laser pulse, the electrons in the collisional simulation rapidly reach a well-thermalized distribution with ${\sim}3.5~\text{keV}$ temperature, while in the collisionless simulation the absorption is several orders of magnitude weaker. Circular polarization inhibits the generation of suprathermal electrons, while ensuring efficient bulk heating through inverse bremsstrahlung, a mechanism usually overlooked at relativistic laser intensity. An additional simulation, taking account of both collisional and field ionization, yields similar results: the bulk electrons are heated to ${\sim}2.5~\text{keV}$ , but with a somewhat lower degree of thermalization than in the pre-set, fixed-ionization case. The collisional absorption mechanism is found to be robust against variations in the laser parameters. At fixed laser pulse energy, increasing the pulse duration rather than the intensity leads to a higher electron temperature.

scholarly journals Physics of short pulse laser plasma interaction by multi-dimensional particle-in-cell simulations

1999 ◽  
Vol 17 (3) ◽  
pp. 571-578 ◽  
Author(s):  
A. PUKHOV ◽  
J. MEYER-TER-VEHN
Keyword(s):  
Short Pulse ◽  
Laser Pulses ◽  
Laser Plasma Interaction ◽  
Particle In Cell ◽  
Wake Field ◽  
Short Pulse Laser ◽  
Direct Laser ◽  
Underdense Plasmas ◽  
Laser Pulse Power ◽  
Overdense Plasma

Interaction of relativistically strong laser pulses with under- and overdense plasmas is studied by 3D particle-in-cell simulations. We show that electrons in the underdense plasmas can be accelerated not only by the plasma wake field, but also by direct laser push in self-generated magnetic and electrostatic fields. These two mechanisms of acceleration manifest themselves in the electron energy spectra as two effective “temperatures.” We show that the fast electrons transport a significant part of the laser pulse power through the overdense plasma in the form of magnetized jets. We also find high collective stopping because of an anomalous resistivity of the plasma.

scholarly journals Sensitivity analysis of simplified low cost converging thermal wave technique for thin bilayer solid

2014 ◽  
Vol 3 (3) ◽  
pp. 158
Author(s):  
M. Shahril Shahril Bin Husin
Keyword(s):  
Sensitivity Analysis ◽  
Thermal Wave ◽  
Short Pulse ◽  
Low Cost ◽  
Wave Model ◽  
Physical Parameters ◽  
Transient Heating ◽  
Simple Method ◽  
Short Pulse Laser ◽  
Correlated Parameters

<div><p class="ABSabstract">In this paper, the sensitivity analysis of thermo physical parameters of the semi-infinite bilayer was presented by using a simplified converging thermal wave model. This is done under the consideration that radial flow of converging thermal wave substantially dominates in the first layer and axial thermal wave, dominates in the second layer. The sensitivity of the correlated parameters due to the 5%, 10% and 100% of increment were evaluated.. The results of the calculated temperature were simulated by Mathematica software, in order to generate a sensitivity analysis and examined by graphs. From this analysis, we concluded the optimum conditions, hence to be applied in the real experiment. Our merit on this report is for introducing a simple method of optical transient heating by using low cost equipment such as camera’s flash lamp and thermocouple, which may also apply to the short pulse laser measurement. A brief theory of the present work is presented and the results obtained from the simulation are discussed.</p></div>

scholarly journals Particle-in-cell simulations of density peak formation and ion heating from short pulse laser-driven ponderomotive steepening

2019 ◽  
Vol 26 (12) ◽  
pp. 123103 ◽  
Author(s):  
Joseph R. Smith ◽  
Chris Orban ◽  
Gregory K. Ngirmang ◽  
John T. Morrison ◽  
Kevin M. George ◽  
...  
Keyword(s):  
Pulse Laser ◽  
Short Pulse ◽  
Ion Heating ◽  
Density Peak ◽  
Particle In Cell ◽  
Short Pulse Laser
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