A5101728985- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Gyrotron and Vacuum Electronics Research
- Particle Detector Development and Performance
- Laser-Matter Interactions and Applications
- Superconducting Materials and Applications
- Spectroscopy and Laser Applications
- Advanced X-ray Imaging Techniques
- Advanced Fiber Laser Technologies
- Muon and positron interactions and applications
- Photonic and Optical Devices
- Ion-surface interactions and analysis
- Laser Material Processing Techniques
- Terahertz technology and applications
- Mass Spectrometry Techniques and Applications
- Integrated Circuits and Semiconductor Failure Analysis
- Advanced Surface Polishing Techniques
- Photocathodes and Microchannel Plates
- Radiation Effects and Dosimetry
- Particle physics theoretical and experimental studies
- Plasma Diagnostics and Applications
- Solid State Laser Technologies
- Laser-induced spectroscopy and plasma
- Laser-Plasma Interactions and Diagnostics
- Adsorption and Cooling Systems
University of Electronic Science and Technology of China
2024
University of Science and Technology of China
2007-2024
National Synchrotron Radiation Laboratory
2007-2024
Sun Yat-sen University
2024
Thermal Power Research Institute
2024
Communication University of China
2015
Université Laval
2004-2007
Institut National d'Optique
2005
When a powerful femtosecond laser pulse propagates in an optical medium, self-focusing occurs. Normally, it is the most part (slice) of that self-focuses first during its propagation. Self-focusing balanced by creation plasma self-focal volume, which defocuses pulse. This balance leads to limitation peak intensity (intensity clamping). The series self-foci from different slices front give rise perception so-called filament. back undergoes self-phase modulation and self-steepening resulting...
Following the discovery of Higgs boson at LHC, new large colliders are being studied by international high-energy community to explore physics in detail and beyond Standard Model. In China, a two-stage circular collider project CEPC-SPPC is proposed, with first stage CEPC (Circular Electron Positron Collier, so-called factory) focused on physics, second SPPC (Super Proton-Proton Collider) This paper discusses this stage.
Abstract The Super Tau-Charm Facility (STCF) is a new generation electron-positron collider designed to explore frontier physics in the tau-charm energy region, with center-of-mass range of 2–7 GeV and luminosity 0.5× 10 35 cm -2 s -1 . positron injector critical component circular colliders. It employs 2.5 electron beam strike tungsten target, thereby generating beams. After production, positrons are captured initially accelerated 260 MeV pre-acceleration section, followed by further...
A femtosecond laser-induced clean fluorescence technique was explored as a means to monitor halogenated alkanes in the atmosphere. Characteristic difluorocarbene radical (CF2) UV−vis can be generated inside filament for different halocarbons. We show that, due dissociation and excitation kinetics leading emission, it is possible temporally resolve characteristic of CF2-containing halocarbons from that background species, therefore enhancing signal-to-noise ratio. Laboratory-scale experiments...
As the most successful tau-charm factory of world, BEPC II will celebrate its 10th birthday this year and finish historical mission in next decade. Because very important role high energy phys-ics study, certainly need a successor, new collider. This paper discusses feasi-bility greenfield generation collid-er named HIEPA. The luminosity successor is about 5×1034 cm−2s−1 pilot 1×1035cm⁻²s^{−1} nominal, with electron beam longitudinally polarized at IP. general scheme accelerators parameters...
We present here a recent experiment on long-distance free propagation of powerful ultrafast laser pulses. A large divergence the beam pattern at anti-Stokes side was experimentally observed, which contrasts tiny spots Stokes long distances, while central wavelength practically unchanged (self-guiding). White light self-interference patterns were also recorded and discussed.
To meet the fast-growing demands for high-quality low-energy photon beams, a new synchrotron radiation light source conception was brought forward several years ago by National Synchrotron Radiation Laboratory, which named Hefei Advanced Light Source (HALS). The dominant of HALS will be located in VUV and soft X-ray region, complementary with that SSRF HEPS. Except high brilliance, transverse coherence another signature feature HALS. achieve these goals, multi-bend achromat based...
A miniaturized Penning ion source, capable of generating a milliampere ${\mathrm{H}}^{+}$ beam with low anode power supply and gas consumption, was produced tested for neutron tubes. For better understanding optimization the magnetic field, extraction system, plasma simulations were conducted to research source. The distance between two cathodes is optimized based on simulations. Based cathodes, current source had been increased from 1.21 1.72 mA, ratio 36% 42.3%.
Abstract A new generation electron-positron collider — the Super Tau-Charm Facility (STCF) has been proposed in China. The STCF will have a luminosity greater than 0.5 × 10 35 cm -2 s -1 and center-of-mass energy range of 2 to 7 GeV. Injectors are an essential component circular colliders, particularly positron generating systems. injector, Linac, accelerates both electrons positrons from 1.0 GeV up 3.5 with high intensity 1.5 nC per bunch for research. An injector high-energy...
A proposal has been made for the construction of a new generation high-luminosity electron-positron colliders known as Super Tau-Charm Facility (STCF) in China. The STCF aims to achieve luminosity exceeding [Formula: see text][Formula: text]cm[Formula: text]s[Formula: text] and will operate within center-of-mass energy range 2 7[Formula: text]GeV. Given design challenges collider ring, swap-out injection proposed an alternative method achieving desired luminosity. Consequently, injector...
Abstract Beam optics design for a Super Tau-Charm Factory (STCF) that planning in China is presented this paper. This STCF an electron-positron circular collider characterized with high luminosity, wide energy ranges as well longitudinally polarized electron beam. In order to achieve the recently proposed collision scheme based on large Piwinski angle and crab waist sextupole will be adopted. paper, beam optical parameters their basis storage ring lattice are given. addition, preliminary...
A cylindrical hollow plasma cavity was designed for a particle-driven accelerator experiment future e <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">+</sup> xmlns:xlink="http://www.w3.org/1999/xlink">-</sup> colliders. Surface wave ionization used to generate high-density, highly stable instead of the laser ionization. Microwave and models were optimize structure, gas pressure, microwave frequency power produce high-quality plasma. The...
This contribution presents a novel bunch current measurement system based on an ultra-fast photodetector and high-speed digitizer at Hefei Light Source II (HLS II). In order to achieve bunch-by-bunch resolution, the sampling rate of is nearly 225 GS/s via dedicated equivalent algorithm. According preliminary tests daily operation mode single-bunch mode, root-mean-square (rms) relative error distribution 1.03%, which illustrates new satisfies requirements for high-precision measurement....
Stripline position monitors can be used as a nonintercepting emittance monitor and it is independent of the beam distribution. Usually, difference/sum ratio method to pick up second moment. Two new methods are put forward, which log-ratio combined method. The analysis comparing these introduced. Change current quadrupole magnets m times (mges6) upstream from BPM change Transfer matrix, then calculated.
Abstract A nondestructive method to measure beam energy spread using the quadrupole modes within a microwave cavity is proposed. Compared with button position monitor (BBPM) or stripline (SBPM), narrow band pickup and therefore has better signal-to-noise ratio (SNR) resolution. In this study, rectangular designed. TM220 mode operating at 4.76 GHz in reflects moment of beam. The plans be installed behind bending magnet Dalian Coherent Light Source (DCLS), an extreme ultraviolet FEL facility....
The Super Tau-Charm Facility (STCF) is a proposed dual-ring electron–positron collider in China, designed to operate at center-of-mass energy (CME) range of 2–7[Formula: see text]GeV with symmetric beam energies. aims for luminosity exceeding [Formula: text] the 2.0[Formula: text]GeV. This work presents preliminary lattice design STCF ring, specifically optimized energy. To improve nonlinear dynamics performance, optimization carried out by adjusting strengths sextupole and octupole magnets...