A5101971301- Laser-Plasma Interactions and Diagnostics
- Advanced X-ray Imaging Techniques
- Laser-induced spectroscopy and plasma
- Particle Accelerators and Free-Electron Lasers
- High-pressure geophysics and materials
- Laser-Matter Interactions and Applications
- Advanced Surface Polishing Techniques
- Nuclear Physics and Applications
- Magnetic confinement fusion research
- Astro and Planetary Science
- Pulsed Power Technology Applications
- Gamma-ray bursts and supernovae
- Gyrotron and Vacuum Electronics Research
- Diamond and Carbon-based Materials Research
- Laser Material Processing Techniques
- Planetary Science and Exploration
- Terahertz technology and applications
- Space Satellite Systems and Control
- Atomic and Molecular Physics
- Spectroscopy and Laser Applications
- Laser Design and Applications
- Advanced Fiber Laser Technologies
- Particle accelerators and beam dynamics
Shenzhen Technology University
2021-2022
Peking University
2014-2021
State Key Laboratory of Nuclear Physics and Technology
2014-2021
Deutsches Elektronen-Synchrotron DESY
2016-2020
Ministry of Education of the People's Republic of China
2019-2020
Universität Hamburg
2018
Key Laboratory of Nuclear Radiation and Nuclear Energy Technology
2014
We report the experimental generation of highly energetic carbon ions up to 48 MeV per nucleon by shooting double-layer targets composed well-controlled slightly underdense plasma and ultrathin foils with ultraintense femtosecond laser pulses. Particle-in-cell simulations reveal that are ejected from due radiation pressure then accelerated in an enhanced sheath field established superponderomotive electron flow. Such a cascaded acceleration is especially suited for heavy ion The breakthrough...
A compact laser plasma accelerator (CLAPA) that can stably produce and transport proton ions with different energies less than 10 MeV, $<1%$ energy spread, several to tens of pC charge, is demonstrated. The high current beam continuous spectrum a large divergence angle generated by using contrast micron thickness targets, which later collected, analyzed refocused an image-relaying line combination quadrupole bending electromagnets. It eliminates the inherent defects laser-driven beams,...
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...
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...
Ultra-short untraintense laser interacting with solid targets can produce significant electromagnetic pulses (EMPs), which are strongly pertinent to and target parameters. In this study, EMPs' generation due pulsed (30 fs, 6×1019 W/cm2) irradiating aluminum foils recorded analyzed. The experimental results indicate a pre-ablation pulse (200 ps, 1×1012 that tends enhance the emission inside chamber diagnostic cavity. largest EMP signal is obtained when incident on at 100 ps prior main beam....
Contact imaging based on MeV energy laser accelerated protons is studied in this paper. First, we show that both external structures and the internal organs of ants can be distinguished with micrometer spatial resolution by proton radiography. Then, systematically study several specific influence factors their coupled effects radiography, i.e., accumulated shot number, irradiation dose, different types detectors, incident energy, using two specially designed calibration targets. Under our...
Particle emittance quantifies the ability to focus and transport a beam, is one of most important parameters for beamline. The proton beam produced by ultraintense laser irradiation micron-thick flat solid target has been measured systematically first time, using three different methods at positions along beamline: pepper-pot method, quadrupole triplet scan technique, single-shot measurement. Emittance growth shown both in experiments simulations CST. An over 3-fold was found 5 MeV...
We present a novel scheme for dense electron acceleration driven by the laser irradiation of near-critical-density plasma. The reflux effect in transversely tailored plasma is particularly enhanced area peak density. observe bubble-like distribution re-injected electrons, which forms strong quasistatic electromagnetic field that can accelerate electrons longitudinally while also preserving transverse emittance. Simulation results demonstrate over-dense could be trapped such an artificial...
Over the past decade production of multi-GeV electron beams from laser-driven plasma accelerators has been successfully demonstrated. However, demanding applications such as compact electron-driven X-ray sources require further improvements on beam energy spread and transverse emittance. One promising candidate to satisfy these requirements is externally inject an generated by RF linac into a accelerator. We present studies optimization final quality injected accelerated GeV energy, using...
From plasma-wakefield acceleration as a physics experiment toward plasma-based accelerator user facility, the beam issues remaining to be solved are still numerous. Providing beams with high energy, charge, and quality simultaneously, not only within plasma but also at doorstep itself, is main concern. Despite its tremendous efficiency in particle acceleration, wakefield displays complex 3D profile which, associated beam-loading field induced by accelerated makes of charge energy often...
Electromagnetic pulses (EMPs) produced by the interaction of a TW femtosecond laser with solid targets at Compact Laser Plasma Accelerator (CLAPA) are measured and interpreted. The statistical results confirm that intensities EMPs closely related to both target material thickness. signal titanium is more abundant than copper same thickness, intensity EMP positively correlated thickness for aluminium foil. With boosted radiations, energy accelerated protons also simultaneously enhanced. In...
We have studied the generation of terahertz (THz) radiation via interaction an intense femtosecond laser pulse with aluminum (Al) and plastic targets pre-ablated by a picosecond ablation pulse. The measurements plasma shadowgraph 1D-MULTI simulations show similar micrometer density scale length for two types after ablation. It is found that Al target, intensity THz increased obviously under condition ablation, only appropriate delay time, cutoff energy charge accelerated protons also...
Compared with conventional accelerators, laser plasma accelerators can generate high energy ions at a greatly reduced scale, due to their TV/m acceleration gradient. A compact accelerator (CLAPA) has been built the Institute of Heavy Ion Physics Peking University. It will be used for applied research like biological irradiation, astrophysics simulations, etc. beamline system multiple quadrupoles and an analyzing magnet laser-accelerated is proposed here. Since ion beams have broad spectra...
A compact laser plasma accelerator (CLAPA) is being built at Peking University, which based on an RPA-PSA mechanism or other acceleration mechanisms. The beam produced by this has the characteristics of short duration, high pulse current, large divergence angle, and wide energy spectrum. cannot be a normal ion source accelerator. space charge field in initial very strong. According to parameters from preparatory experiments theoretical simulations, line preliminarily designed. mainly...
The EuPRAXIA (European Particle Research Accelerator with excellence In Applications) project aims at producing a conceptual design for the worldwide plasma-based accelerator facility, capable of delivering multi-GeV electron beams high quality. This facility will be used various user applications such as compact X-ray sources medical imaging and high-energy physics detector tests. explores different approaches to plasma acceleration techniques. Laser-driven wakefield external injection an...
A Compact laser plasma accelerator (CLAPA) is being built in Peking University, which based on RPA-PSA mechanism or other acceleration mechanisms. According to the beam parameters from preparatory experiments and theoretical simulations, line preliminarily designed. The mainly constituted by common transport elements deliver proton with energy of 1~50MeV, spread 0~1% current 0~108 per pulse satisfy requirement different experiments. simulation result 15MeV an 1%, 1x108 final spot radius 9mm...
This work shows for the first time laser plasma accelerator integrated with a magnet lattice can deliver reliably protons ideal beam qualities, such as 1% energy spread of different energies and good uniformity. experiment also demonstrates precise adjustment accelerated proton in terms energy, charge diameter repeatability availability. Spread-Out Bragg Peak (SOBP) three-dimensional radially symmetric dose distribution cancer therapy, key technology radiotherapy malignant tumors, is...
A compact electron radiography system has been designed with high gradient permanent magnet quadrupoles 2.5 times magnification. Quasi-monoenergetic bunches energies ranging from 100 to 200 MeV are generated a laser wakefield accelerator (LWFA) acting as the source for system. matching segment composed of three before objective plane creates correlation between position and angle electrons, illuminating observed object improved resolution We expect 100-MeV ultrafast be widely adopted many...
Comparing with the conventional accelerator, laser plasma accelerator can accelerate ions more effectively and greatly reduce scale cost. A accelerator− Compact Laser Plasma Accelerator (CLAPA) is being built at Institute of Heavy Ion physics Peking University. According to beam parameters from proof principle experiments theoretical simulations, we design line for transport which now in near future will carry out experimental study it. The mainly constituted by quadrupole analyzing magnets...