A5054225369- Laser-Plasma Interactions and Diagnostics
- Laser-Matter Interactions and Applications
- Laser-induced spectroscopy and plasma
- High-pressure geophysics and materials
- Orbital Angular Momentum in Optics
- Advanced Fiber Laser Technologies
- Laser Design and Applications
- Atomic and Molecular Physics
- Advanced X-ray Imaging Techniques
- Dust and Plasma Wave Phenomena
- Ionosphere and magnetosphere dynamics
- Magnetic confinement fusion research
- Nuclear Physics and Applications
- Gyrotron and Vacuum Electronics Research
- Astrophysics and Cosmic Phenomena
- Advanced Data Storage Technologies
- Terahertz technology and applications
- Distributed systems and fault tolerance
- Boron and Carbon Nanomaterials Research
- Rare-earth and actinide compounds
- Planetary Science and Exploration
- Nuclear physics research studies
- Perovskite Materials and Applications
- Space Exploration and Technology
- Parallel Computing and Optimization Techniques
Zhejiang University
2018-2025
Shenzhen Technology University
2017-2024
Institute for Basic Science
2018
Peking University
2012-2018
Shenzhen University
2017-2018
Institute of Applied Physics and Computational Mathematics
2017-2018
China Academy of Engineering Physics
2018
Ruhr University Bochum
2018
Shanghai Jiao Tong University
2018
State Key Laboratory of Nuclear Physics and Technology
2016-2017
Betatron radiation from direct-laser-accelerated electrons is characterized analytically and numerically. It shown here that the electron dynamics strongly dependent on a self-similar parameter S(≡n_{e}/n_{c}a_{0}). Both transverse momentum energy are proportional to normalized amplitude of laser field (a_{0}) for fixed value S. As result, total number radiated photons scales as a_{0}^{2}/sqrt[S] conversion efficiency accelerated a_{0}^{3}/S. The particle-in-cell simulations agree well with...
Abstract We show a new resonance acceleration scheme for generating ultradense relativistic electron bunches in helical motions and hence emitting brilliant vortical γ -ray pulses the quantum electrodynamic (QED) regime of circularly-polarized (CP) laser-plasma interactions. Here combined effects radiation reaction recoil force self-generated magnetic fields result not only trapping great amount electrons laser-produced plasma channel, but also significant broadening bandwidth between laser...
The recent advancement of high-intensity lasers has made all-optical Compton scattering become a promising way to produce ultrashort brilliant γ-rays in an ultra-compact system. However, so far achieved γ-ray sources are limited by low conversion efficiency and spectral intensity. Here we present highly efficient gamma photon emitter obtained irradiating laser pulse on miniature plasma device consisting lens mirror. This concept exploits strong spatiotemporal laser-shaping process...
A method of using intense Laguerre–Gaussian (LG) laser pulse is proposed to generate ultrarelativistic (multi-GeV) electron beams with controllable helical structures based on a hybrid acceleration regime in underdense plasmas, where both the longitudinal charge-separation electric field and transverse play role accelerating electrons. By directly interacting LG pulse, topological structure accelerated beam manipulated it spatially separated into multi-slice bunches. These results are...
Ion acceleration in near-critical plasmas driven by intense laser pulses is investigated theoretically and numerically. A theoretical model has been given for clarification of the ion dynamics relation to different target parameters. Two distinct regimes have identified, where ions are accelerated by, respectively, laser-induced shock wave weakly regime (comparatively low intensity) nonlinear solitary strongly high intensity). Two-dimensional particle-in-cell simulations show that...
Abstract This paper provides an overview of the current status ultrafast and ultra-intense lasers with peak powers exceeding 100 TW examines research activities in high-energy-density physics within China. Currently, 10 high-intensity over are operational, about additional being constructed at various institutes universities. These facilities operate either independently or combined one another, thereby offering substantial support for both Chinese international development efforts physics.
It is shown that the filamentation instability of relativistically intense laser pulses in plasmas can be mitigated case where beam has an elliptically distributed profile. A high-power elliptical Gaussian would break up into a regular pattern-in contrast to randomly filaments circularly beam-and much more power concentrated central region. highly experiences anisotropic self-focusing and diffraction processes plasma channel ensuring unstable diffractive rings circular cannot produced. The...
Dimensional effects in particle-in-cell (PIC) simulation of target normal sheath acceleration (TNSA) protons are considered. As the spatial divergence laser-accelerated hot electrons and resulting space-charge electric field on backside depend dimension, maximum energy accelerated obtained from three-dimensional (3D) simulations is usually much less than that two-dimensional (2D) simulations. By closely examining TNSA 2D 3D PIC simulations, we deduce an empirical ratio between proton...
Laser driven proton acceleration is proposed to be greatly enhanced by using a cone-tube target, which can easily manufactured current 3D-print technology. It observed that energetic electron bunches are generated along the tube and accelerated much higher temperature combination of ponderomotive force longitudinal electric field induced optical confinement laser field. As result, localized sheath produced at rear target maximum energy about three-fold increased based on two-dimentional...
We use three-dimensional particle-in-cell simulations to demonstrate that a plasma density channel can stably guide the petawatt laser pulse in near critical plasmas. In this regime, directed, collimated, and micro-sized gamma photon beam is emitted by direct-laser accelerated electrons along axis. While case without channel, tilting behavior leads generation of randomly deflected beams with large divergence angle transverse source size. addition, channels, be much reduced using smaller...
Energetic electron acceleration processes in a plasma hollow tube irradiated by an ultraintense laser pulse are investigated. It is found that the longitudinal component of field much enhanced when linear polarized Gaussian propagates through tube. This $\ensuremath{\pi}/2$ phase shift relative to transverse electric and has $\ensuremath{\pi}$ interval between its upper lower parts. The electrons first pulled out then trapped field. can further be accelerated higher energy presence mechanism...
Laser-to-ion energy conversion efficiency is important for ion-beam driven inertial confinement fusion. We propose to use a suitable plasma waveguide enhance ion acceleration by an ultrashort ∼1021 W cm−2 laser pulse. Three-dimensional (3D) particle-in-cell (PIC) simulations show that, compared with that of the standard planar target, more than order magnitude increase maximum and possible. In particular, intensity cm−2, duration 26.7 fs 0.85 J, 3D PIC one can obtain 46 MeV protons 150...
Short, brilliant pulses of MeV-level gamma rays with controllable orbital angular momentum (OAM) and small divergence angle would be useful for precision microscopy, nuclear imaging, radiography, micromanipulation, more. These are still unavailable, though, due to the unavoidable laser-induced damage associated traditional methods. The authors show how make such a gamma-ray pulse (shown in red), based on tailored interaction an intense OAM-carrying Laguerre-Gaussian laser (green) underdense...
It is shown that the intense quasistatic electric and magnetic fields self-generated near axis of laser-driven channel in an appropriately profiled preplasma during ultraintense laser interaction with a thin target can create dense relativistic electron bunches. The latter easily penetrate through greatly enhance sheath field at rear, resulting significant increase laser-to-ion energy conversion efficiency maximum normal accelerated ions. Particle-in-cell simulations show hydrogen targets...
Laser-driven gamma-ray source potentially offers a compact, cost-effective, ultra-short, and ultra-bright alternative to conventional sources based on large-scale particle accelerators. Based the laser-driven approach, we use multidimensional particle-in-cell simulations demonstrate that nanostructured double-layer target, which consists of foam coated top metal substrate, can absorb laser energy into high-energy electrons in foam, then efficiently convert it copious gamma photons via...
Filamentation dynamics of relativistic optical vortex beams (OVBs) propagating in underdense plasma is investigated. It shown that OVBs with finite orbital angular momentum (OAM) exhibit much more robust propagation behavior than the standard Gaussian beam. In fact, growth rate azimuthal modulational instability decreases rapidly increase OVB topological charge. Thus, can maintain their profiles for significantly longer distances an before filamentation occurs. also found would then break up...
The direct laser-acceleration mechanism, nonlinear parametric resonance, of relativistic electrons in a linearly polarized laser-produced plasma channel is examined by self-consistent model including the laser dispersion plasmas. Nonlinear resonance can be excited, and oscillation amplitude grows exponentially when betatron frequency electron motion varies roughly twice natural oscillator. It shown analytically that region defined self-similar parameter nenca0. width this decreases with...
Perovskite quantum dots (QDs) are of great interest due to their outstanding optoelectronic properties and tremendous application potential. Improving photoluminescence (PL) spectra in all-inorganic perovskite QDs is importance for performance enhancement. In this work, the PL yield CsPbBr3 enhanced from 70% 95% with increasing radiation pressure. Such enhancement attributed increased binding energy self-trapped excitons (STEs) upon pressure, which consistent its blue-shifted other...
Multiple lasers interacting with a deuterated (D) pitcher-catcher target and neutron generation are investigated using two-dimensional hybrid particle-in-cell Monte Carlo simulations. It is found that when multiple laser pulses focused on the front surface of pitcher layer, D+ ion acceleration by normal sheath (TNSA) enhanced interfering overlapped light fields resulting periodic target-surface structure. With three each 4.5 × 1019 W cm−2 intensity, 33 fs duration ∼160 mJ energy, focusing at...
Propagation of high-current relativistic electron beam (REB) in plasma is relevant to many high-energy astrophysical phenomena as well applications based on high-intensity lasers and charged-particle beams. Here, we report a new regime beam-plasma interaction arising from REB propagation medium with fine structures. In this regime, the cascades into thin branches local density hundred times initial value deposits its energy 2 orders magnitude more efficiently than that homogeneous plasma,...
A new physical model of the hosing instability that includes relativistic laser pulses and moderate densities is presented derives density dependence equation. This tested against two-dimensional particle-in-cell simulations. These simulations further examine feasibility using multiple to mitigate in a Nd:glass-type parameter space. An examination effects planar versus cylindrical exponential gradients on also presented. The results show strongly more geometries are capable mitigating which...
The hosing processes of a relativistic laser pulse, electron acceleration, and betatron radiation in parabolic plasma channel are investigated the direct acceleration regime. It is shown that instability would result generation randomly directed off-axis beam source with large divergence angle. While employing preformed channel, restoring force provided by correct perturbed wave front thus suppress instability. As result, accelerated emitted photons well guided concentrated along axis....
It was shown that in the interactions of ultra-intense circularly polarized laser pulse with near-critical plasmas, angular momentum can be transferred efficiently from beam to electrons through resonance acceleration process. The increases almost linearly time ${t}_{a}$ when are resonantly accelerated by field. In addition, it is analytically averaged proportional amplitude ${a}_{L}$, and total electron square ${a}_{L}^{2}$ for a fixed parameter $\frac{{n}_{e}}{{n}_{c}{a}_{L}}$. These...