A5060275591- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Gyrotron and Vacuum Electronics Research
- Superconducting Materials and Applications
- Magnetic confinement fusion research
- Metaheuristic Optimization Algorithms Research
- Advanced Thermodynamic Systems and Engines
- Advanced Algorithms and Applications
- Acoustic Wave Resonator Technologies
- Electromagnetic Launch and Propulsion Technology
- Advanced Multi-Objective Optimization Algorithms
- Refrigeration and Air Conditioning Technologies
- Electromagnetic Simulation and Numerical Methods
- Technology and Security Systems
- Spacecraft and Cryogenic Technologies
- Pulsed Power Technology Applications
- Heat Transfer and Optimization
Wuhan University
2023-2024
Institute of High Energy Physics
2017-2024
China Spallation Neutron Source
2024
Chinese Academy of Sciences
2017-2023
University of Chinese Academy of Sciences
2018-2023
Neural network (NN) has been tentatively combined into multi-objective genetic algorithms (MOGAs) to solve the optimization problems in physics. However, computationally complex physical evaluations and limited computing resources always cause unsatisfied size of training set, which further results handling strict constraints ineffectively. Here, dynamically used NN-based MOGA (DNMOGA) is proposed for first time, includes redistributing number evaluated individuals different operators some...
A superconducting 166.6 MHz quarter-wave beta=1 cavity was recently proposed for the High Energy Photon Source (HEPS), a 6 GeV kilometer-scale light source. Four cavities will be used main acceleration in newly planned on-axis beam injection scheme realized by double-frequency RF system. The fundamental frequency, MHz, dictated fast kicker technology and preference of using 499.8 SC as third harmonic. Each operated at 4.2 K providing 1.2 MV accelerating voltage 150 kW power to electron beam....
Abstract The 2.7 W/4.2 K two-stage pulse tube cryocooler (Model PT425) was developed and introduced by Cryomech, Inc. in 2021, which, at the time, largest, commercially available, 4 cryocooler. Our newest model, PT450, has been successfully developed, providing a minimum of 5.0 W 4.2 on 2nd stage with 65 45 1st simultaneously, operating either 60 or 50 Hz power. PT450 answers market’s need for continuing development large cryogen-free dilution refrigerators, superconducting magnets, helium...
Abstract Radiofrequency cavities play a crucial role in synchrotron light sources by replenishing beam energy and providing sufficient accelerating voltage. Compared to traditional TM010 cavities, TM020 offer advantages such as higher quality factor, voltage, lower characteristic impedance. Additionally, their unique field distribution allows strategic placement of dampers at radial nodes, effectively suppressing higher-order modes within compact structure. However, the radiofrequency...
High-energy photon source is a 6-GeV diffraction-limited synchrotron light with ultralow beam emittance. A 166.6-MHz quarter-wave superconducting <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$\beta$</tex-math></inline-formula> =1 structure was proposed as the main accelerating cavities for storage ring. The high current of 200 mA requires heavy damping higher order modes (HOMs) in to avoid coupled...
Radiofrequency (RF) cavities hold immense importance in various accelerator applications, but their optimization poses significant challenges due to complex situations involved. In this study, a recently proposed multi-objective algorithm is utilized optimize the 325 MHz double spoke cavity, which characterized by 38 geometric parameters and one of most commonly used accelerators. The combines neural network dynamically speed up convergence MOGAs, it called DNMOGA. Remarkably, when comparing...