A5011758039- Laser-Plasma Interactions and Diagnostics
- Laser-Matter Interactions and Applications
- Laser-induced spectroscopy and plasma
- High-pressure geophysics and materials
- Nuclear Physics and Applications
- Atomic and Molecular Physics
- Ion-surface interactions and analysis
- Radiation Therapy and Dosimetry
- Advanced X-ray Imaging Techniques
- Crystallography and Radiation Phenomena
- Particle Accelerators and Free-Electron Lasers
- Photocathodes and Microchannel Plates
- Autism Spectrum Disorder Research
- Photonic and Optical Devices
- Dark Matter and Cosmic Phenomena
- Spectroscopy and Laser Applications
- Terahertz technology and applications
- Genetics and Neurodevelopmental Disorders
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Gyrotron and Vacuum Electronics Research
- Family and Disability Support Research
- Diamond and Carbon-based Materials Research
Shanghai Jiao Tong University
2016-2025
Xi'an Jiaotong University
2021-2025
Nanjing University
2025
Guangzhou Medical University
2023
Institute of Plasma Physics
2023
The range of potential applications compact laser-plasma ion sources motivates the development new acceleration schemes to increase achievable energies and conversion efficiencies. Whilst evolving nature interactions can limit effectiveness individual mechanisms, it also enable hybrid schemes, allowing additional degrees control on properties resulting beam. Here we report an experimental demonstration efficient proton exceeding 94 MeV via a scheme radiation pressure-sheath in ultrathin foil...
Coherent transition radiation in the terahertz (THz) region with energies of sub-mJ/pulse has been demonstrated by relativistic laser-driven electron beams crossing solid-vacuum boundary. Targets including mass-limited foils and layered metal-plastic targets are used to verify mechanism characterize properties. Observations THz emissions as a function target parameters agree well formation-zone diffraction model radiation. Particle-in-cell simulations also reproduce observed characteristics...
The characterization and manipulation of ultrashort high-intensity laser pulses were investigated both numerically experimentally using an ultrathin foil as plasma shutter. Our work revealed a intensity enhancement with clean steepened leading edge when the pulse passed through expanded moderate-density plasma. fast dynamics laser–plasma interaction in underdense, transparent, overdense regimes elucidated by measuring temporal-spatial phase profiles transmitted pulses. Key nonlinear effects...
Interface polarization (one of the slow polarizations) is considered primary mechanism driving microwave absorption (MA), but limitations in material composition and microstructure design often lead to weak interfacial relaxation. In this work, we developed an interesting heterostructure consisting carbon nanotube-encapsulated α-Fe2O3 nanocolumns (CNTs@α-Fe2O3). The curvature effects CNTs induce a built-in electric field between nanocolumns, facilitating effective interface polarization....
Spin rotation is central for the spin manipulation of lepton beams which, in turn, plays an important role investigation properties spin-polarized and examination spin-dependent interactions. However, realization compact ultrafast beams, between longitudinal transverse polarizations, still faces significant challenges. Here, we put forward a novel method (picosecond timescale) relativistic beam via employing moderate-intensity terahertz (THz) wave dielectric-lined waveguide (DLW). The...
Strong-field quantum electrodynamics (SF-QED) plays a crucial role in ultraintense laser–matter interactions and demands sophisticated techniques to understand the related physics with new degrees of freedom, including spin angular momentum. To investigate impact SF-QED processes, we have introduced spin/polarization-resolved nonlinear Compton scattering, Breit–Wheeler, vacuum birefringence processes into our particle-in-cell (PIC) code. In this article, provide details implementation these...
We report on a plasma optical shutter to reduce the intensity level of nanosecond-duration pedestal amplified spontaneous emission (ASE) using an ultrathin foil. The foil is ionized by ASE prepulse and forms expanding underdense preplasma, which enables main laser pulse transmission, leading enhancement in temporal contrast. When such placed front target interest, preplasma profiles observed are similar that produced from single-layer reference irradiated high-contrast laser, can be finely...
We report on charge state measurements of laser-accelerated carbon ions in the energy range several MeV penetrating a dense partially ionized plasma. The plasma was generated by irradiation foam target with laser-induced hohlraum radiation soft x-ray regime. use tricellulose acetate (${\mathrm{C}}_{9}{\mathrm{H}}_{16}{\mathrm{O}}_{8}$) $2\text{ }\text{ }\mathrm{mg}/{\mathrm{cm}}^{3}$ density and 1 mm interaction length as material. This kind is advantageous for high-precision measurements,...
An all-optical method of ultrafast spin rotation is put forward to precisely manipulate the polarization relativistic charged particle beams leptons or ions. Laser-driven dense ultrashort are manipulated via single-shot interaction with a copropagating temporally asymmetric laser pulse moderate intensity. Using semiclassical numerical simulations, we show that initial lepton (proton) beam can be rotated any desired orientation by flexible control over phase retardation between precession and...
We report experimental results on the effects of laser contrast beam divergence and energy spectrum protons emitted from ultrashort intense interactions with normal large foils transverse-size-reduced targets. Correlations between spectral shape are found. Large near-plateau observed for both types targets when pulse is low. With high irradiation, proton remarkably reduced changed to exponential foil In comparison, a similar remain The could be explained by preplasma formation target...
In preparation for an experiment with a laser-generated intense proton beam at the Laser Fusion Research Center Mianyang to investigate 11 B(p, α )2 reaction, we performed measurement very low energy between 140 keV and 172 using high-voltage platform Institute of Modern Physics, Lanzhou. The aim was test ability use CR-39 track detectors cross-section measurements remeasure this reaction close first resonance thick target approach. We obtained σ = 45.6 ± 12.5 mb near 156 keV. Our result...
The results of a commissioning experiment on the SILEX-Ⅱ laser facility (formerly known as CAEP-PW) are reported. is complete optical parametric chirped-pulse amplification facility. peak power reached about 1 PW in 30 fs pulse duration during experiment. contrast was better than 1010 at 20 ps ahead main pulse. In basic foil target interaction, set experimental data were collected, including spatially resolved x-ray emission, image coherent transition radiation, harmonic spectra direction...
The influence of the laser temporal contrast on high-order harmonic generation from intense interactions with solid-density plasma surfaces is experimentally studied.A switchable mirror system set up to improve by two orders magnitude at 10 ps prior main peak.By using and tuning prepulse, dependence HOHG investigated.Harmonics 21 st order via mechanism coherent wake emission are observed only when targets irradiated high pulses applying mirror.
Proton emission from solid foil targets irradiated by relativistically intense femtosecond laser pulses is studied experimentally. Broad plateaus in energy spectra are measured micron-thick when the incident have relatively low intensity contrasts. It proposed that such proton can be attributed to combined processes of laser-driven collisionless shock acceleration and target normal sheath acceleration. Simple analytic estimation two-dimensional particle-in-cell simulations performed, which...
Abstract White dwarfs play important roles in stellar evolution and help us gauge the age of our galaxy. The white dwarf H1504+65, hottest known post-asymptotic giant branch star, is peculiar due to its C- O-rich but He- H- deficient atmosphere whose composition cannot be well predicted by current models. analysis elemental abundance benchmark atmospheric models depends heavily on spectral data under cosmic conditions, which are currently extremely scarce. We created a well-defined, uniform,...
The laboratory generation and diagnosis of uniform near-critical-density (NCD) plasmas play critical roles in various studies applications, such as fusion science, high energy density physics, astrophysics well relativistic electron beam generation. Here we successfully generated the quasistatic NCD plasma sample by heating a low-density tri-cellulose acetate (TCA) foam with high-power-laser-driven hohlraum radiation. temperature is determined to be 20 eV analyzing spectra obtained...
To explore the relationship between autistic clinical profiles and age at first concern diagnosis among children with autism spectrum disorder. The included severity of autism, cognition, adaptability, language development, regression.The multivariate linear regression model was used to examine association diagnostic first-concern further stratification analysis.A total 801 were included. Language delay associated earlier (language delay: crudeβ: -0.80, 95%CI%: -0.92--0.68; regression:...
Abstract A novel intense beam-driven scheme for high yield of the tri-alpha reaction 11B(p,α)2αwas investigated. We used a foam target made cellulose triacetate (TAC, C9H16O8) doped with boron.It was then heated volumetrically by soft X-ray radiation from laser hohlraum and turned into homogenous, long living plasma. employed picosecond pulse to generate high-intensity energetic proton beam via well-known Target Normal Sheath Acceleration (TNSA) mechanism. observed up 10^10/sr αparticles per...
We present a novel design of two-dimensional (2D) angular-resolved spectrometer for full beam characterization ultrashort intense laser driven proton sources. A rotated 2D pinhole array was employed, as selective entrance before pair parallel permanent magnets, to sample the into discrete beamlets. The beamlets are subsequently dispersed without overlapping onto planar detector. Representative experimental result protons generated from femtosecond interaction with thin foil target is presented.
Proton emissions from vacuum-gapped cascaded-ultrathin-foil targets irradiated with low-contrast intense picosecond laser pulses were measured. The maximum energy of the proton beam and laser-to-proton conversion efficiency both increased in comparison those single-layer reference targets. A transition plateau to exponential profile spectral shape was found for target a front-foil thickness above 500 nm. measured annular x-ray front rear sides indicate that enhancement could be attributed...
The equilibrium charge state distribution of laser-accelerated carbon ions traversing a tri-cellulose-acetate (TCA, C9H16O8) foam target was measured experimentally. were generated through the normal sheath acceleration mechanism. This allowed us to obtain for wide energy range near maximum loss within single laser shot. had porous structure with 2 mg/cm3 volume density, which is between typical density gas- and solid-state matter. We found that average states significantly underestimated by...
High-brilliance high-polarization γ rays based on Compton scattering are of great significance in broad areas, such as nuclear physics, high-energy astrophysics, etc. However, the transfer mechanism spin angular momentum transition from linear through weakly into strongly nonlinear processes is still unclear, which severely limits simultaneous control brilliance and polarization rays. In this work, we clarify regions put forward a clear way to efficiently manipulate emitted photons. We find...
We report a new scenario of the time-of-flight technique in which fast neutrons and delayed gamma-ray signals were both recorded millisecond time window harsh environments induced by high-intensity lasers. The gamma signals, arriving far later than original neutron often being ignored previously, identified to be results radiative captures thermalized neutrons. linear correlation between photon number yield shows that these events can employed for diagnosis. This method reduce detecting...
The origin of He+ ions in picosecond intense laser–gas interaction was experimentally and numerically investigated. A nanosecond laser pulse used to modulate the plasma condition, which helps distinguish helium with different charge states. By comparing energy spectra He2+ experiments with/without shaping, we found neither ion–atom nor electron–ion recombination is responsible for generation, supported by two-dimensional hydrodynamic simulations theoretical calculations.