A5065637476- Laser-Plasma Interactions and Diagnostics
- Laser-induced spectroscopy and plasma
- Laser-Matter Interactions and Applications
- High-pressure geophysics and materials
- Atomic and Molecular Physics
- Particle Accelerators and Free-Electron Lasers
- Advanced X-ray Imaging Techniques
- Advanced Chemical Physics Studies
- Molecular Spectroscopy and Structure
- Gyrotron and Vacuum Electronics Research
- Spectroscopy and Quantum Chemical Studies
- Magnetic confinement fusion research
- Spectroscopy and Laser Applications
- Adaptive optics and wavefront sensing
- Astro and Planetary Science
- Advancements in Photolithography Techniques
- Advanced Fiber Laser Technologies
- Nanocluster Synthesis and Applications
- Pulsed Power Technology Applications
- Quantum, superfluid, helium dynamics
- Gas Dynamics and Kinetic Theory
- Ion-surface interactions and analysis
Shanghai Institute of Optics and Fine Mechanics
2015-2025
Chinese Academy of Sciences
2013-2024
Shandong Normal University
2008-2009
Imperial College London
1993
University of Bristol
1993
Rutherford Appleton Laboratory
1993
Abstract In this paper, the parallel Bayesian optimization algorithm is investigated for of compact free electron lasers driven by laser wakefield accelerators. The radiation energy chosen as objective function, which can be optimized to 25 μJ after several tens iterations from random input samplings in soft X-ray regimes. Such a sampling strategy exhibits faster convergence speed and better function compared serial algorithms. Our proposed scheme not only shows feasible design FELs LWFA...
Despite the successful demonstration of compact free electron lasers (FELs) driven by laser wakefield accelerators (LWFAs), pursuit further enhancements in high-gain FELs presents a challenge due to limitations beam quality. In this work, we pinpoint pivotal physics and optimization strategies for high-quality single-stage LWFAs that are crucial FELs. We have delved into synergistic injection mechanism, where self-evolution threshold is far from reached at position, with both shock front...
The Faraday effect, caused by a magnetic-field-induced change in the optical properties, takes place vast variety of systems from single atomic layer graphenes to huge galaxies.Currently, it plays pivot role many applications such as manipulation light and probing magnetic fields material's properties.Basically, this effect causes polarization rotation during its propagation along field medium.Here, we report an extreme case where linearly polarized ultrashort laser pulse splits time into...
A third-order correlation system has been developed, which enables the contrast ratio of high-intensity ultra-short laser pulses to be measured on a single shot, with dynamic range better than 108.
A right-hand circularly polarized electromagnetic wave can propagate in a sufficiently magnetized plasma of any density without encountering cutoff the whistler mode. With recent realization tens-kilotesla magnetic fields, laser propagation highly high-density plasmas has become practical interest, especially for heating to high energy and igniting fusion targets. In this paper, regime laser-plasma interaction is discussed. It shown by one- two-dimensional particle-in-cell simulations that...
The non-local heat transport of hot electrons during high-intensity laser interaction with plasmas can preheat the fuel and limit flow in inertial confinement fusion. It increases entropy decreases final compression. In this paper, electron model that is based on improved Schurtz–Nicolaï–Busquet (SNB) algorithm has been embedded into radiation hydrodynamic code benchmarked two classical cases. Then, we studied a 2ω ablating CH target by using module. found effect becomes significant when...
By using two-dimensional particle-in-cell simulations, we propose a scheme for strong coupling of petawatt laser with an opening gold cone filled near-critical-density plasmas. When relevant parameters are properly chosen, most energy can be fully deposited inside the only 10% leaving tip opening. Due to asymmetric ponderomotive acceleration by strongly decayed pulse, high-energy-density electrons net gain accumulated cone, which then stream out continuously, like jet. The jet relativistic,...
Novel features associated with multiterawatt laser interactions solid targets at incident irradiances in the range (1.0--12.0)\ifmmode\times\else\texttimes\fi{}${10}^{17}$ W ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}2}$ are presented. Collimation of plasma flow normal to target surface has been observed time-integrated x-ray images and ion-velocity measurements. Ions emitted from have a characteristic energy typically 100 keV. The ion spectrum extends 1.5 MeV. Calculations presented that...
Three-dimensional particle-in-cell simulation is used to investigate radiation-pressure driven acceleration and compression of small solid-density plasma by intense laser pulses. It found that multiple impacts presently available short-pulse lasers on a hemispheric shell target can create long-living tiny quasineutral monoenergetic bunch very high energy density.
The generation of super-high energetic electrons influenced by pre-plasma at relativistic intensity laser-matter interaction is studied in a one-dimensional slab approximation with particle-in-cell simulations. Different scale-lengths $1\ \mu\text{m}$, $5\ $10\ \mu\text{m}$ and $15\ are considered, showing an increase both particle number cut-off kinetic energy the scale-length, greatly exceeding corresponding laser ponderomotive energy. A two-stage electron acceleration model proposed to...
The effect of a transient magnetic field on right-hand circularly polarized (RHCP) laser light propagation in overcritical-density plasma is investigated. When the electron gyrofrequency larger than wave frequency, RHCP can propagate along external an overcritical density without resonance or cutoff. However, when falls to below cyclotron point, propagating pulse will be truncated and local electrons resonantly heated. Particle-in-cell simulation shows that applied thin slab, process produce...
The two stage electron acceleration model [arXiv:
We demonstrate a simple but efficient way to optimize and improve the properties of laser-wakefield-accelerated electron beams (e beams) based on controllable shock-induced density down-ramp injection that is achieved with an inserted tunable shock wave. The e are from 400 800 MeV charge ranges 5 180 pC. high reproducibility (of ~95% in consecutive 100 shots) were produced elaborate experiments average root- mean-square energy spread 0.9% divergence 0.3 mrad. Three-dimensional...
It is shown by particle-in-cell simulations that a narrow electron beam with high energy and charge density can be generated in subcritical-density plasma two consecutive laser pulses. Although the first pulse dissipates rapidly, second propagate for long distance thin wake channel created further accelerate preaccelerated electrons therein. Given also self-focuses, resulting has waist densities. Such beams are useful enhancing target-back space-charge field target normal sheath acceleration...
A simple but comprehensive two-dimensional analytical model for the interaction of a normally incident short intense laser pulse with solid-density plasma is proposed. Electron cavitation near target surface by ponderomotive force induces strong local electrostatic charge-separation field. The makes possible mode conversion light into longitudinal electron oscillation at frequency, even initial normal incidence pulse. field in cavity can significantly enhance induced u×B twice frequency to...
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation S. X. Luan, Wei Yu, M. Y. H. B. Zhuo, Han Xu, A. Wong, J. W. Wang, F. Shen, Z. Xu; Target normal sheath acceleration of foil ions by laser-trapped hot electrons from a long subcritical-density preplasma. Phys. Plasmas 1 December 2014; 21 (12): 123110. https://doi.org/10.1063/1.4903878 Download citation file:...
A new ion acceleration scheme, namely, target parallel Coulomb acceleration, is proposed in which a carbon plate sandwiched between gold layers irradiated with intense linearly polarized laser pulses. The high electrostatic field generated by the ions efficiently accelerates embedded to plane of target. beam found be collimated concave-shaped potential. As result, quasi-monoenergetic and C6+-ion an energy exceeding 10 MeV/nucleon produced at intensity 5 × 1019 W/cm2.
As an extension of the previous work [arXiv: 1512.02411], we have investigated role circularly polarized (CP) laser pulses while keeping other conditions same. It is found that in presence large scale pre-formed plasmas, super-high energetic electrons can be generated at relativistic CP laser-solid interactions. For intensity $10^{20}\ \text{W}/\text{cm}^2$ and pre-plasma scale-length $10\ \mu\text{m}$, cut-off energy electron by $120\ \text{MeV}$ compared with $100\ case linearly (LP)...
Abstract We propose a method to generate circularly polarized (CP) attosecond pulses by the interactions of relativistic-intensity right-hand CP laser pulse and magnetized sub-critical plasma. It is theoretically numerically demonstrated that when an external magnetic field with appropriate strength applied plasma along propagation, ponderomotive force at vacuum-plasma boundary significantly enhanced. The electrons are then steadily pushed forward until timely-increasing charge separation...
Abstract Laser light trapping in cavities near-critical density plasmas is studied by two-dimensional particle-in-cell simulation. The laser ponderomotive force can create the plasma a vacuum cavity bounded thin overcritical-density wall. self-consistently trapped as half-cycle electromagnetic wave form of an oscillon-caviton structure until it slowly depleted through interaction with When contains preformed cavity, become standing latter. characterized multi-peak structure. overdense wall...
Abstract The trajectory calculations of He+H , He+D and He+T reactions on the Palmieri potential energy surface (Palmieri et al., Mol Phys, 2000, 98, 1835) have been carried out to study isotope effect stereodynamics at collision 50 kcal/mol. distributions dihedral angle P (ϕ r ) between ′, (θ are discussed. product rotational alignment parameters 〈 2 ( ′● )〉 for title compared with mass factors. Furthermore, angular vectors in form polar plot θ ϕ calculated. indicate that properties...
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation Z. Y. Ge, W. Yu, H. B. Zhuo, C. T. Zhou, Ma, X. Yang, P. D. Zou, S. Luan, Yin, F. Q. Shao, J. Peng; Resonant absorption not-so-resonant in short, intense laser irradiated plasma. Physics of Plasmas 1 July 2013; 20 (7): 073301. https://doi.org/10.1063/1.4813254 Download citation file: Ris (Zotero) Reference...
Structural prediction of thiolate-protected gold nanoclusters (AuNCs) with diverse charge states can enrich the understanding this species. Untill now, number anion AuNCs is still deficient. In work, a series negative total charge, including [Au28(SR)17]-, [Au35(SR)20]-, [Au42(SR)23]-, [Au49(SR)26]-, and [Au56(SR)29]-, are designed. Following crystallized [Au23(SR)16]- prototype structure, inner core newly predicted clusters obtained through packing crossed Au7. Next, proper protecting...