A5046496146- Laser-Plasma Interactions and Diagnostics
- Laser-induced spectroscopy and plasma
- Laser-Matter Interactions and Applications
- High-pressure geophysics and materials
- Atomic and Molecular Physics
- Orbital Angular Momentum in Optics
- Magnetic confinement fusion research
- Quantum Information and Cryptography
- Near-Field Optical Microscopy
- Laser Design and Applications
- Nuclear Physics and Applications
- Electrohydrodynamics and Fluid Dynamics
- Planetary Science and Exploration
- Advanced X-ray Imaging Techniques
- Hepatitis C virus research
- Laser Material Processing Techniques
- Hepatitis B Virus Studies
- Tardigrade Biology and Ecology
- Terahertz technology and applications
- Particle Accelerators and Free-Electron Lasers
- Quantum Mechanics and Applications
- Atomic and Subatomic Physics Research
- Crystallography and Radiation Phenomena
- Bacteriophages and microbial interactions
- Mass Spectrometry Techniques and Applications
Shanghai Institute of Optics and Fine Mechanics
2018-2024
Chinese Academy of Sciences
2022-2024
WuXi AppTec (China)
2024
University of Chinese Academy of Sciences
2018-2022
Shanghai Normal University
2022
Abstract We investigated the emission of multi-MeV γ-Ray beams with orbital angular momentum (OAM) from interaction an intense circularly polarized (CP) laser a micro-channel plasma target. The driving can generate high energy electrons via direct acceleration within channel. By attaching foil as reflecting mirror, CP is reflected and automatically colliding electrons. High gamma-photons are emitted through inverse Compton scattering (ICS) during collision. Three-dimensional particle-in-cell...
Abstract We propose a new approach based on an all-optical set-up for generating relativistic polarized electron beams via vortex Laguerre-Gaussian (LG) laser-driven wakefield acceleration. Using pre-polarized gas target, we find that the topology of resolves depolarization issue injected electrons. In full three-dimensional particle-in-cell simulations, incorporating spin dynamics Thomas-Bargmann Michel Telegdi equation, LG laser preserves polarization by more than 80% while assuring...
Chronic hepatitis B (CHB) represents a significant unmet medical need with few options beyond lifelong treatment nucleoside analogues, which rarely leads to functional cure. Novel agents that reduce levels of HBV DNA, RNA and other viral antigens could lead better outcomes. The capsid assembly modulator (CAM) class compounds an important modality for chronic suppression improve cure rates, either alone or in combination.
The acceleration of polarized electrons and protons in strong laser plasma fields is a very attractive option to obtain beams the GeV range. We investigate feasibility particle without destroying an initial polarization, taking into account all relevant mechanisms that could cause polarization losses, i.e. spin precession described by T-BMT equation, Sokolov-Ternov effect Stern-Gerlach force. Scaling laws for (de-)polarization time caused these effects reveal dominant limiting rotation...
We investigate the precession of electron spins during beam-driven plasma-wakefield acceleration based on density down-ramp injection by means full three-dimensional (3D) particle-in-cell (PIC) simulations. A relativistic beam generated via, e.g., laser wakefield acceleration, serves as driving source. It traverses prepolarized gas target and accelerates polarized electrons via excited wakefield. derive criteria for parameters limitation injected flux to preserve a high degree polarization...
Abstract Accelerating a free electron to high‐energy forms the basis for studying particle and nuclear physics. Here it is shown that wave function of such an energetic can be further manipulated with femtosecond intense lasers. During scattering between circularly polarized laser pulse, regime found where enormous spin angular momenta photons efficiently transferred orbital momentum (OAM). The scattered twisted from its initial plane‐wave state quantum vortex state. Nonlinear...
Abstract High brightness gamma rays can be generated by colliding an ultra-intense laser pulse with a high energy electron beam. This collision phenomenon also represents powerful approach to explore new physics in the exotic strong field Quantum Electro-Dynamics (QED) regime. Here we show that cross-collision geometry, there exists barrier induced classical radiation-reaction force prohibits electrons of arbitrarily energies pass. However, such vanishes QED picture, where well reflected...
We propose a filter method to generate electron beams of high polarization from bubble and blow-out wakefield accelerators. The mechanism is based on the idea identifying all electron-beam subsets with low filtering them out an X-shaped slit placed immediately behind plasma accelerator. To find these we investigate dependence between initial azimuthal angle spin single electrons during trapping process. This shows that transverse spins preserve their orientation injection if they are...
Abstract The discrete and stochastic nature of the processes in strong-field quantum electrodynamics (SF-QED) regime distinguishes them from classical ones. An important approach to identifying SF-QED features is through interaction extremely intense lasers with plasma. Here, we investigate seeded QED cascades driven by two counter-propagating laser pulses background residual gases a vacuum chamber via numerical simulations. We focus on statistical distributions positron yields repeated...
The colliding between ultra-relativistic electrons and an ultra-intense laser pulse is a powerful approach to testify the physics in strong-field QED regime. By considering spin-dependent radiation-reaction during laser-electron collision we find anti-symmetric deflection of with different spin states. We revealed that such induced by non-zero work done force along field polarization-direction half-period phase, which larger for spin-anti-paralleled smaller spin-paralleled electrons....
Micro-structures are advantageous in manipulating the laser intensity and laser-driven high energy electron sources. Both effects benefit acceleration of protons by ultra-intense pulses. We investigate enhancement on proton cut-off yield induced micro-wire-array structure via particle-in-cell simulation. Our simulations reveal that abundant energetic electrons originating from structures essential for sequential acceleration. find this effect becomes active only when pulse reaches a = 2. The...
We propose obtaining polarized proton beams based on CO2-laser-driven collisionless shock acceleration (CSA) of the pre-polarized HCl gas. By tailoring density profile gas, intense CO2 laser pulse heats plasma target and forms a strong that reflects protons to high energy. According particle-in-cell simulations implemented with spin dynamics, directional several MeV were generated at total beam polarization over 80%. Simulations showed precession occurred in azimuthal magnetic fields by...
We investigated the effect of a plasma charge separation field on radiation reaction (RR) in laser–plasma interactions. By implementing equation developed one-dimension into classical Landau–Lifshitz formula, our numerical test-particle modeling revealed distinctive electron dynamics three regimes: low density underdense regime, near-critical (NCD) regime and highly overdense one. It is discovered from trajectories gamma-ray emission that RR mostly significant at densities. The underlying...
Abstract Herein, we propose a scheme based on collision-less shock acceleration (CSA) involving the use of composite targets comprising micro-structured foil and pre-polarized gas for obtaining high-energy polarized proton beams. Femtosecond laser pulses irradiate microwire-array (MWA) target efficiently heat dense plasma, which moves toward dilute plasma. Shocks are then introduced in to accelerate upstream spin-polarized protons relativistic velocities. Based particle-in-cell simulations...
We investigated laser proton acceleration in the bubble regime when radiation reaction (RR) effects become non-negligible. By using particle-in-cell simulations, it is shown that addition to field, RR trapped electrons form another charge-separation leading fast of background protons at early stage. However, for insufficient intensities, reduced field and length originating from depletion by gamma-photon emission do not allow trapping further protons. The final energy significantly smaller...
High-energy photons can be generated via inverse Compton scattering (ICS) in the collision between energetic electrons and an intense laser pulse. The development of plasma accelerators promises compact all-optical gamma-ray sources by colliding from wakefield with high-power driving pulses reflected a mirror. However, law optical focusing hinders realization both high photon yield monochromatic spectra this scenario. We propose azimuthal spatial-temporal convertor that decouples focal field...
Research on laser-plasma interaction in the quantum-electrodynamic (QED) regime has been greatly advanced by particle-in-cell and Monte Carlo simulations (PIC-MC). While these are widely used, we find that a noticeable numerical error arises due to inappropriate implementation of quantum process accounting for hard photon emission pair production PIC-MC codes. The stems from low resolution QED table used sample energy, which is generated logarithmic scale cannot resolve high energy photons....
Abstract Particles in vortex states have gained arising interests due to the additional degree of freedom—the orbital angular momentum (OAM) inherently existing state. With increasing energy particles (photons, leptons etc), research has gradually transitioned from classical field regime collisions quantum-field regime. The latter provides a new way study rich properties particle physics. Here, we show characteristics bremsstrahlung by deriving corresponding scattering probability following...
A consistent description of the radiative polarization for relativistic electrons in intense laser fields is derived by generalizing Sokolov-Ternov effect general field structure. The new form together with spin-dependent radiation-reaction force provides a complete set dynamical equations electron momentum and spin strong fields. When applied to varying fields, e.g. generalized allows gain or lose any directions other than along magnetic rest frame electron. theory collision process between...
The rapid advancement of x-ray free-electron laser technology facilitates the attainment relativistic attosecond pulses in future. It could serve as an ideal source to explore x-ray-driven high-energy density physics, such particle acceleration and secondary radiation at solid densities. Here, utilizing particle-in-cell simulations, we systematically investigate high-order harmonic generation (HHG) based on intense lasers interacting with crystal-like structures. We find that nonlinear...
Abstract We explore radiative polarization of electrons in a standing-wave formed by two circularly-polarized laser pulses irradiating thin layer. Here the electron spin dynamics external electromagnetic fields is described generalized Sokolov–Ternov model implemented particle-in-cell simulations. find that significant established roughly one period from circular motion standing wave. However, such unstable at magnetic nodes migrate to different phases. The beam then transferred transverse...
Relativistic laser–plasma interaction can produce nonthermal electron spectra in power-law scaling. The index for near-critical density plasmas changes between 1.8 and 2.0 as the laser intensity varies from relativistic threshold to radiation-dominated regime. While effective temperature of electrons is strongly suppressed by radiation–radiation effect, it found that power-laws are consistent radiation OFF ON cases. It decreases ∼1.4 plasma becomes over-critical. Similar electrons, proton...
Laser wakefield acceleration (LWFA) promises compact accelerators toward the high-energy frontier. However, approach to 100 GeV milestone faces obstacle of long focal length required for optimal with high-power lasers, which reaches hundreds meters 10–100 PW lasers. The originates from laser intensity avoid nonlinear effects and hence large spot size Rayleigh length. We propose a “telescope” geometry in micro-plasma parabola (MPP) is coupled short-focal-length off-axis parabola, minimizing...
In quantum-electrodynamics scatterings the transfer of angular momentum between initial and final states can be resolved using vortex scattering theory, where involved particles are described by quantum with featured orbital (OAM). Here we employ scenario in bremsstrahlung a plane-wave electron describing photon states. We find that, while total cross-section distribution consistent those from ordinary scattering, former gain non-negligible OAM values even though incident does not contain...