A5101653511- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Superconducting Materials and Applications
- Photonic and Optical Devices
- Gyrotron and Vacuum Electronics Research
- Power Line Communications and Noise
- Semiconductor Lasers and Optical Devices
- Millimeter-Wave Propagation and Modeling
- Nuclear Physics and Applications
- Magnetic confinement fusion research
- Engineering Applied Research
- Metal and Thin Film Mechanics
- Remote Sensing in Agriculture
- Plasma and Flow Control in Aerodynamics
- Mineral Processing and Grinding
- Rocket and propulsion systems research
- Neural Networks and Reservoir Computing
- Atmospheric chemistry and aerosols
- Electromagnetic Launch and Propulsion Technology
- Experimental Learning in Engineering
- Photorefractive and Nonlinear Optics
- Advancements in PLL and VCO Technologies
- Refrigeration and Air Conditioning Technologies
- Advanced Optical Network Technologies
- Network Time Synchronization Technologies
Chinese Academy of Sciences
2008-2025
Institute of High Energy Physics
2018-2025
China Spallation Neutron Source
2018-2025
Aerospace Information Research Institute
2023
State Key Laboratory of Remote Sensing Science
2023
University of Chinese Academy of Sciences
2023
Technical Institute of Physics and Chemistry
2008
Abstract With the energy upgrade of China Spallation Neutron Source (CSNS-II) and increasing demand for isotope production, RF repetition frequency Drift Tube Linac (DTL) accelerator must be elevated from 25 Hz to 50 Hz. However, shifts induced by heating exceed current tuning range. Traditional methods cannot applied during DTL operation, so online technology is explored in this study. Multi-physics simulations were used analyze electromagnetic temperature distribution, shifts, compensation...
Elliptical superconducting cavities are widely used in particle accelerators because they can provide stronger acceleration fields than regular cavities. Pre-tuning is required to improve their performance, but the process time-consuming. This research introduces an automated pre-tuning system for multi-cell elliptical platform integrates three main components: real-time electric field measurements, data analysis based on tuning algorithms, and mechanical adjustment systems. During copper...
The China Spallation Neutron Source drift tube linac (DTL) is a high current intensity linear accelerator operated in pulsed mode. Beam loss the most important cause of DTL performance degradation. Therefore, control beam very crucial to linac's commission and routine operation. pulse width (∼several hundreds microseconds) can be regarded as an instantaneous process, which may local temperature tubes (DTs) exceed melting point or thermal stress material yield strength, resulting permanent...
Fulgides are one kind of organic photochromic compound, which famous for their thermal irreversibility. In this report, from the difference spectra absorption ΔA(λ) pyrrylfulgide, spectral refractive index change Δn(λ) was calculated by Kramers–Kronig relation (KKR), and a good correlation theoretically derived values experimental Δn measured modified Michelson interferometer found. Further, it is demonstrated that possible to calculate dependence diffraction efficiency easily accessible...
The China Spallation Neutron Source upgrade project (CSNS-II) has completed the preliminary design report and is expected to start in fall of 2023. It plans add two types superconducting cavities: 324-MHz double spoke cavity 648-MHz elliptical linac section accelerator beam power from 100 500 kW, requiring more than 40 new fundamental couplers (FPCs). These will operate at pulse mode with a peak ranging 380 kW. To master entire R process FPC for cavities, meanwhile, provide horizontal test...
The design study of a 324 MHz double-spoke cavity is presented in this article. geometric parameters are optimized to get reasonable RF properties (e.g., low <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">E</i> <sub xmlns:xlink="http://www.w3.org/1999/xlink">p</sub> / xmlns:xlink="http://www.w3.org/1999/xlink">acc</sub> , xmlns:xlink="http://www.w3.org/1999/xlink">B</i> and high xmlns:xlink="http://www.w3.org/1999/xlink">R</i>...
An accelerator-based Boron Neutron Capture Therapy (BNCT) facility has been built at the campus of China Spallation Source (CSNS). To upgrade it, a Drift Tube Linac (DTL) is designed to provide 40 mA, 25% duty factor, 10.1 MeV beam for target. Two opposing power couplers are employed deliver forward peak up 640 kW and DTL cavity. A new coaxial coupler with single Tristan type window meet coupling coefficient requirements. In this paper, detailed RF optimization process described. According...
Abstract. Aerosol refers to suspensions of small solid and liquid particles in the atmosphere. Although content aerosol atmosphere is small, it plays a crucial role atmospheric climatic processes, making essential monitor. In areas with poor characteristics, satellite-based optical depth (AOD) values often differ from ground-based AOD measured by instruments like AERONET. The use 3km DT, 10km DT DTB algorithms Beijing area has led significant overestimation values, highlighting need for...