A5036955654- Laser-Plasma Interactions and Diagnostics
- Laser-induced spectroscopy and plasma
- Laser-Matter Interactions and Applications
- Atomic and Molecular Physics
- High-pressure geophysics and materials
- Magnetic confinement fusion research
- Nuclear Physics and Applications
- Particle Accelerators and Free-Electron Lasers
- Laser Design and Applications
- Advanced X-ray Imaging Techniques
- Gamma-ray bursts and supernovae
- Planetary Science and Exploration
- Crystallography and Radiation Phenomena
- Cold Atom Physics and Bose-Einstein Condensates
- Terahertz technology and applications
- Solar and Space Plasma Dynamics
- Electromagnetic Simulation and Numerical Methods
- Orbital Angular Momentum in Optics
- Ionosphere and magnetosphere dynamics
- Advanced Optical Imaging Technologies
- Electron and X-Ray Spectroscopy Techniques
- Electromagnetic Scattering and Analysis
- Plasma Diagnostics and Applications
- Ocular and Laser Science Research
- Astrophysics and Cosmic Phenomena
Stanford University
2024-2025
Chinese Academy of Sciences
2024
Max Planck Institute for Nuclear Physics
2021-2024
Zhejiang University
2023
The University of Texas at Austin
2018-2022
Peking University
2016-2022
State Key Laboratory of Nuclear Physics and Technology
2016-2021
Ministry of Education of the People's Republic of China
2016-2021
Shanxi University
2016-2021
University of California, San Diego
2020-2021
We report on the experimental studies of laser driven ion acceleration from a double-layer target where near-critical density with few-micron thickness is coated in front nanometer-thin diamondlike carbon foil. A significant enhancement proton maximum energies 12 to $\ensuremath{\sim}30\text{ }\text{ }\mathrm{MeV}$ observed when relativistic pulse impinges under linear polarization. attributed enhanced superponderomotive electrons that were simultaneously measured experiments far beyond...
A novel approach is proposed to demonstrate the two-photon Breit-Wheeler process by using collimated and wide-bandwidth γ-ray pulses driven 10-PW lasers. Theoretical calculations suggest that more than 3.2×10^{8} electron-positron pairs with a divergence angle of 7° can be created per shot, signal-to-noise ratio higher 10^{3}. The positron signal, which roughly 100 times detection limit, measured existing spectrometers. This approach, could e^{-}e^{+} pair creation from two photons, would...
Using three-dimensional kinetic simulations, we examine the emission of collimated $\ensuremath{\gamma}$-ray beams from structured laser-irradiated targets with a prefilled cylindrical channel and its scaling laser power (in multi-PW range). The is increased by increasing energy size focal spot while keeping peak intensity fixed at $5\ifmmode\times\else\texttimes\fi{}{10}^{22}\phantom{\rule{0.2em}{0ex}}\mathrm{W}/{\mathrm{cm}}^{2}$. radius proportionally to accommodate change in size....
Sub-10-attosecond pulses with half-cycle electric fields provide exceptional options to detect and manipulate electrons in the atomic timescale. However, availability of such is still challenging. Here, we propose a method generate isolated sub-10-attosecond based on cascade process naturally happening plasma. A 100s-attosecond pulse first generated by shooting moderate overdense plasma one-cycle femtosecond pulse. After that, attosecond cascadedly produce transmission direction unipolarly...
Laser ion acceleration driven by the utmost intense laser pulses pushes superheavy gold ions to unprecedented energies, key for applications ranging from nuclear physics next-generation accelerators.
Plasma current filamentation of an ultrarelativistic electron beam impinging on overdense plasma is investigated, with emphasis radiation-induced polarization. Particle-in-cell simulations provide the classification and in-depth analysis three different regimes filaments, namely, normal filament, abnormal quenching regimes. We show that radiative polarization emerges during instability along azimuthal direction in momentum space, which significantly varies across put forward intuitive...
Transition radiation is a fundamental process of light emission and occurs whenever charged particle moves across an inhomogeneous region. One feature transition that it can create at arbitrary frequency under any velocity. Therefore, significant importance to both science practical applications. In this paper, we provide brief historical review its recent development. Moreover, pay special attention four typical applications radiation, namely the detection high-energy particles, coherent...
A high-intensity laser beam propagating through a dense plasma drives strong current that robustly sustains quasistatic azimuthal magnetic field. The field efficiently accelerates electrons in such confines the transverse motion and deflects forward direction. Its advantage is threshold rather than resonant behavior, accelerating to high energies for sufficiently laser-driven currents. We study electron dynamics via test-electron model, specifically deriving corresponding critical density....
Abstract Experimental measurements using the OMEGA EP laser facility demonstrated direct acceleration (DLA) of electron beams to (505 ± 75) MeV with (140 30) nC charge from a low-density plasma target 400 J, picosecond duration pulse. Similar trends energy density are also observed in self-consistent two-dimensional particle-in-cell simulations. The intensity pulse is sufficiently large that electrons rapidly expelled along propagation axis form channel. dominant mechanism confirmed be DLA...
An ultrahigh-intensity femtosecond laser can establish a longitudinal electric field stronger than 1013 Vm−1 within plasma, accelerating particles potentially to GeV over sub-millimetre distance. Laser-accelerated protons with high brightness and picosecond duration are highly desired for applications including proton imaging flash radiotherapy, while major limitation is the relatively low energy achieved yet, primarily due lack of controllable acceleration structure. Here, we report...
γ-ray flash generation in near-critical-density target irradiated by four symmetrical colliding laser pulses is numerically investigated. With peak intensities about 10^{23} W/cm^{2}, the boost electron energy through direct acceleration, while pushing them inward with ponderomotive force. After backscattering counterpropagating laser, accelerated trapped electromagnetic standing waves or potential well created coherent overlapping of pulses, and emits photons a multiple-laser-scattering...
An all-optical scheme is proposed for studying laser plasma based incoherent photon emission from inverse Compton scattering in the quantum electrodynamic regime. A theoretical model presented to explain coupling effects among radiation reaction trapping, self-generated magnetic field and spiral attractor phase space, which guarantees transfer of energy angular momentum electromagnetic fields particles. Taking advantage a prospective ∼ 1023 W cm−2 facility, 3D particle-in-cell simulations...
Interaction of an ultrastrong short laser pulse with nonprepolarized near-critical density plasma is investigated in ultrarelativistic regime, emphasis on the radiative spin polarization ejected electrons. Our particle-in-cell simulations show explicit correlations between angle resolved electron and structure properties transient quasistatic magnetic field. While magnitude signal indicator field strength created by longitudinal current, asymmetry found to gauge islandlike distribution which...
Abstract Conventionally, friction is understood as a mechanism depleting physical system of energy and an unavoidable feature any realistic device involving moving parts. In this work, we demonstrate that intuitive picture loses validity in nonlinear quantum electrodynamics, exemplified scenario where spatially random counter-intuitively results highly directional flow. This peculiar behavior caused by radiation friction, i.e., the loss accelerated charge due to emission radiation. We...
The extreme electric fields created in high-intensity laser-plasma interactions could generate energetic ions far more compactly than traditional accelerators. Despite this promise, accelerator experiments have been limited to maximum ion energies of ∼100 MeV/nucleon. central challenge is the low charge-to-mass ratio ions, which has precluded one most successful approaches used for electrons: laser wakefield acceleration. Here, we show that a pulse with focal spot moves transverse...
The multiple colliding laser pulse concept formulated by Bulanov et al. ( Phys. Rev. Lett ., vol. 104, 2010 b , 220404) is beneficial for achieving an extremely high amplitude of coherent electromagnetic field. Since the topology electric and magnetic fields pulses oscillating in time far from trivial radiation friction effects are significant field limit, dynamics charged particles interacting with demonstrates remarkable features corresponding to random walk trajectories, limit circles,...
A scheme to radiate a highly collimated γ-ray pulse is proposed through the interaction between an ultra-intense laser and narrow tube target. The pulse, with high conversion efficiency, can be generated as result of electron acceleration in longitudinal electric field. In Particle-in-Cell simulation 10-PW laser, 18% energy transferred into forward γ-rays divergence angle less than 3°. It also found that such produced large range diameters intensities. This could realized experiment coming...
In order to implement radiotherapy based on a laser accelerator, it is necessary precisely control the spatial distribution and energy spectrum of proton beams meet requirements radiation dose in three-dimensional biological target. A compact plasma accelerator has been built at Peking University, which can reliably generate transport MeV-energy protons with specified onto irradiation platform. this paper, we discuss several technologies for accurate laser-accelerated beam large divergence...
The manuscript deals with electron acceleration by a laser pulse in plasma static uniform magnetic field $B_*$. propagates perpendicular to the lines polarization chosen such that $({\bf{E}}_{laser} \cdot {\bf{B}}_*) = 0$. focus of work is on electrons an appreciable initial transverse momentum are unable gain significant energy from absence due strong dephasing. It shown can initiate increase rotating electron, so its becomes directed forward. continues well beyond this turning point where...
Proton acceleration during the interaction of an ultraintense (6 × 1019 W/cm2) femtosecond (fs) laser pulse with a thin (2.5 μm) foil target pre-ablated by picosecond (ps) is experimentally and numerically investigated. Enhancements in both proton cut-off energy charge are observed ablation due to large number energetic electrons generated from preformed preplasma front target. The enhanced beams successfully collected at 4–9 MeV ±4% spread then transported irradiating platform. results show...
The substantial angular divergence of electron beams produced by direct laser acceleration is often considered as an inherent negative feature the mechanism. however arises primarily because standard approach relies on transverse oscillations and their interplay with electric fields pulse. We propose a conceptually different to that leverages longitudinal are present in tightly focused beam. A structured hollow-core target used enhance maintain them over distance much longer than Rayleigh...
The radiation reaction effects on electron dynamics in counter-propagating circularly polarized laser beams are investigated through the linearization theorem and results great agreement with numeric solutions. For first time, properties of fixed points phase-space were analyzed linear stability theory, showing that center nodes will become attractors if classical is considered. Electron significantly affected by densities found to be increasing exponentially near attractors. density growth...
When an ultra-intense relativistic laser is irradiated on a solid target, terahertz (THz) pulses can be generated by coherent transition radiation when the laser-driven electron beams cross rear surface of target. The energy depends number and electrons. By introducing milli-joule picosecond ablation pulse, underdense preplasma with scale length micrometers at front Electron more charge higher produced during interaction between following main pulse preplasma, which enhance THz affect angle....
We propose a self-consistent model which utilizes the polarization vector to theoretically describe evolution of spin relativistic electrons in an intense electromagnetic field. The variation radiative due instantaneous no photon emission is introduced into our model, extends applicability derived from nonlinear Compton scattering under local constant crossed-field approximation complex environment laser plasma interaction. According this we develop Monte Carlo method simulate electron...