- Facilities at a Glance
- All Facilities
- Earth System and Environment
- Engineering Technology
- Space and Astronomy
- Particle and Nuclear Physics
The Shanghai soft X-ray Free-Electron Laser facility (SXFEL)Create Proposal
The Shanghai soft X-ray Free-Electron Laser facility (SXFEL) ,located at the SSRF campus,is developed in two phases: the SXFEL test facility (SXFEL-TF) which started in 2014 and the SXFEL user facility (SXFEL-UF) which started in 2016. The test facility achieved its design goal and passed the national acceptance in Nov. 2020.
SXFEL is the first soft X-ray Free-Electron Laser facility covering the water window band in the world, and is the core platform for the construction of Zhangjiang comprehensive national science center photon science facility cluster. The total length of the device is 532 meters, there are 2 undulator lines, 2 coherent X-ray beam lines and 5 experimental stations. This is the first X-ray Free-Electron Laser user device in China, which will provide the majority of scientific users with cutting-edge research means such as ultra fast process exploration, advanced structure analysis, high-resolution imaging, etc., and become the original innovation source and talent cradle of new discoveries in scientific research, new principles, new technologies, and new methods in the field of free electron laser in China.
Coherent Scattering and Imaging Endstation（CSI）
Coherent scattering and Imaging Endstation is combined with advanced fluorescent super-resolution microscopic imaging technology,integrating the first X-ray Free Electron Laser and fluorescent super-resolution nano imaging system in the world.It can realize dynamic imaging of cell structure and function,It is characterized by using atomic XFEL coherent high brightness femtosecond pulses,combining coherent diffraction imaging to realize the pre damage imaging of the sample,and obtain the real structure information of the sample. It also covers cutting-edge research areas such as fine structure analysis of novel materials, multi-physical field in situ imaging and X-ray - matter interaction.
Live-cell fluorescent super-resolution microscope endstation (SRM)
The live-cell fluorescent super-resolution microscope endstation is to label the target structure with fluorescence probe,to illuminate the fluorescent sample with laser of suitable wavelength,and combine with four PI imaging technology,to realize single cell three-dimensional super-resolution imaging. It can be used to observe cell and tissue morphology,subcellular structure, etc. Further combined with X-ray imaging technology,it can realize the function of ultrastructure and fluorescence,in-situ composite imaging.
Time-resolved X-ray Scattering (TXS)
Using it, we can study the electronic states and lattice structures of various elements in materials,also the ultra fast dynamic changes within one billionth of a second.Utilizing this experimental station,We can study high-temperature superconductors,and study noval materials with strong correlation between electrons and electrons, between electrons and lattices and interaction.We can also study the ultrafast behavior of electrons in nonequilibrium state in quantum materials provides the most advanced material platform for the new type of quantum ultrafast devices.
Ultrafast X-ray Spectroscopy for Chemistry（UXS)
The ultrafast X-ray spectroscopy endstation is equipped with a grating-based X-ray spectrometer with a cross-bar optical design to resolve the x-ray energies and the time-delays at the same time.
The optical pumping laser is irradiating normally on to the sample surface while the probing XFEL pulses incidental to the sample surface with an grazing angle of 2 degree. This cross-bar optical design encodes the time-delay between the two pulses onto the sample surface, which is imaged on to the detector.
The Ultrafast X-ray Spectroscopy for Chemistry system can be used to study the ultrafast processes including chemical reaction kinetics, energy/charge-transfer process.
atomic, molecular and optical endstation (AMO)
The reaction microscope (REMI) at the Shanghai soft x-ray free electron laser for AMO science consists of a supersonic gas injection system, a spectrometer, and detectors with a data acquisition system. The pump-probe scheme will be provided with the synchronization of the external optical laser to the XFEL pulse. An Even-Lavie type high temperature pulsed valve will be implemented to further extend from gas sample to liquid or even volatile biomolecules in solid states. By measuring the time of flight and impact positions of ions and electrons on their corresponding detector, three-dimensional momentum vectors can be reconstructed in a coincidence manner. Momentum resolutions of ions and electrons with 0.11 a.u. can be achieved.
The composite velocity imaging spectrometer (CpVMI) is one of two novel instruments at the Shanghai soft x-ray free electron laser for AMO science. The CpVMI consists of an ultrasonic molecular beam generation device, an electron velocity imaging system, a three-dimensional ion momentum imaging system and a vacuum system. The molecular beam or cluster beam generated by the ultrasonic molecular beam device enters the reaction chamber and interacts with the x-ray free electron laser or optical laser pulses, and then the produced electrons and ions fly towards the electron and ion imaging systems to obtain their momentum and energy information. The pump-probe scheme can be supported with in-coupling of x-ray with the external optical laser. The scientific objectives are to reveal the quantum characteristics such as strong field nonlinear phenomena, ultrafast dynamics of photoexcited systems, nanoplasma formation and evolution, and photoelectron diffraction and so on. Compared with the existing advanced spectrometers in the world, a major feature of the CpVMI is that the dynamical measurement range of electronic kinetic energy upgrades from 100 eV up to 1000 eV with a higher energy resolution, which provides a powerful observation capability for the related physical and chemical processes.