飞秒激光驱动的超快X射线动力学实验站OA

[Background]Ultrashort and ultraintense laser-driven plasma X-ray sources offer femtosecond pulse durations,intrinsic spatiotemporal synchronization,compactness,and cost-effectiveness,serving as an important complement to traditional large-scale light sources and providing novel experimental tools for ultrafast dynamics research.[Purpose]Built upon the Synthetic Extreme Condition User Facility(SECUF),the first open-access user experimental station in China based on high-power femtosecond lasers was established to deliver various types of ultrafast radiation sources,supporting studies on ultrafast material dynamics and frontier strong-field physics.[Methods]The station is equipped with a dual-beam titanium-sapphire laser system(3 TW/100 Hz and PW/1 shot/min)and multiple beamlines with multifunctional target chambers.Through interactions between the laser and solid targets,gas targets,or plasmas,various ultrafast light sources—such as Kα X-ray,Betatron radiation,and inverse Compton scattering—are generated.Platforms for strong-field terahertz pump-X-ray probe(TPXP)experiments and tabletop epithermal neutron resonance spectroscopy have also been developed.[Results]A highly stable ultrafast X-ray diffraction and TPXP platform was successfully established,enabling direct observation of strong-field terahertz-induced phase transition in VO2.The world's first tabletop high-resolution epithermal neutron resonance spectroscopy device was developed.On the PW beamline,hundred-millijoule-level intense terahertz radiation,efficient inverse Compton scattering,and high-charge electron beams were achieved.[Conclusions]Integrating high-performance lasers,diverse radiation sources,and advanced diagnostic platforms,this experimental station provides a flexible and efficient comprehensive facility for ultrafast science,promising to advance ultrafast dynamics research toward broader accessibility and more cutting-edge directions.