A5068651434- Superconducting Materials and Applications
- Physics of Superconductivity and Magnetism
- Particle accelerators and beam dynamics
- Electromagnetic Launch and Propulsion Technology
- Superconductivity in MgB2 and Alloys
- Advanced MRI Techniques and Applications
- Atomic and Subatomic Physics Research
- Microstructure and mechanical properties
- Advanced NMR Techniques and Applications
- Energetic Materials and Combustion
- Magnetic Bearings and Levitation Dynamics
- Aluminum Alloys Composites Properties
- Spacecraft and Cryogenic Technologies
- Aluminum Alloy Microstructure Properties
- Metallurgy and Material Forming
- Electric Motor Design and Analysis
- Particle Accelerators and Free-Electron Lasers
- Plasma Diagnostics and Applications
- High-Velocity Impact and Material Behavior
- Pulsed Power Technology Applications
- Microstructure and Mechanical Properties of Steels
- Induction Heating and Inverter Technology
- Mechanical stress and fatigue analysis
- Electromagnetic Effects on Materials
- Magnetic Properties of Alloys
Institute of Electrical Engineering
2015-2024
Chinese Academy of Sciences
2013-2024
University of Chinese Academy of Sciences
2021-2024
Beijing Institute of Technology
2014
University of Science and Technology Beijing
2006-2007
University at Buffalo, State University of New York
1989
Abstract Metal-insulation (MI) REBCO high-temperature superconducting (HTS) magnet has the advantages of short charging delay, low contact losses, and self-protection abilities, which shows important application prospects in many fields. Recently, Institute Electrical Engineering, Chinese Academy Sciences developed a prototype on-board MI HTS coil used for electrodynamic suspension (EDS) system working with an acceleration beyond 8 g. To design reliable engineering magnet, specific I c angle...
The ultra-high-field superconducting magnets have been widely applied in scientific instruments for condensed matter physics. A magnet with the center field of 25 T a warm bore-size 32 mm diameter has designed Extreme Condition Experimental Science Facility (ExCES). consists NbTi, Nb <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> Sn coils and YBCO high-temperature (HTS) insert operated at 4.2 K. In order to prove technical feasibility...
A 9.4-T/800-mm superconducting magnet for whole-body magnetic resonance imaging system has been designed and will be constructed from NbTi conductors. Main coils wound on five aluminum alloy formers provide the center field strength of about 9.4 T. In addition, compensation another former are used to improve uniformity region. The operating point inner main coil is very close critical properties its wire, temperature margin 0.4 K. It necessary know mechanical stress in during all conditions....
CuSn alloy is the key raw material for preparation of Nb3Sn superconducting wires. The properties wires can be greatly enhanced by preparing alloys with high solid solubility Sn atoms and adding Ti elements. In this paper, was prepared directional solidification added. Then homogenization system determined calculation it expected to improve structure segregation mechanical alloy. Therefore studies distribution elements relationship between microstructure evolution in results indicate that...
A 9.4 Tesla superconducting magnet is designed and fabricated with a warm bore of 800 mm for neuroscience research. The will be made NbTi Wire-in-Channel (WIC) conductor higher ratio copper to non-copper, which thus sustains the high stresses. It cooled operate temperature at 4.2 K liquid helium. cryostat system through GM cryocoolers, some used cool radiation shield, others realize re-condensed MRI has level stored energy, about 134 MJ, relatively-lower nominal current, 212.5 A. operated in...
Extremely-high field nuclear magnetic resonance (NMR) spectrometer has the potential to significantly augment resolution and sensitivity of atomic spectrum, which will largely boost development a range scientific areas. The success extremely-high NMR depends on superconducting magnet system great extent. A high-temperature (HTS) insert low-temperature (LTS) shim coils design scheme for 27 T was proposed in this work. LTS background used generate 15 central area designed HTS contribute...
To investigate the erosion phenomenon of solid armature in sliding electrical contact process, a 2-D numerical model melt-wave (MWE) based on finite element method was established this article. In model, magnetic field excitation boundary expands along direction into new area. And compared with four previous models under same conditions, and comparison results show good consistency. addition, temperature dependence conductivity considered to its effect MWE. It is found that velocity faster...
A spherical superconducting rotor is spinning at low temperature of 4.2 K. The mass unbalance torque generated by gravity, inertia, and suspension force acting on the that has a eccentricity. An analytical model proposed to calculate torques rotor. Analytical results show due axial eccentricity affects drift, radial speed vibration.
A superconducting magnet with the center field of 9.4 T is designed and fabricated for 400 MHz Nuclear Magnetic Resonance. Superconducting coil NbTi/Cu wire employed cooled by re-condensed liquid helium system clear-bore 54 mm. The pulsed tube refrigerator separated valve to cool system. has an active shield high pure copper protect during quench shielding coil. paper reports electromagnetic design, fabrication detailed.
Persistent current NbTi superconducting joint were fabricated based on the cold-pressing welding method for 400 MHz nuclear magnetic resonance (NMR) magnet. The electrical properties of joints tested using decay measurement method. To simulate actual coil assembly, a nine-joint series loop was made and tested. Test results show that total resistance nine persistent is 3×10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-14</sup> Ω at 120 A...
Low-segregation Cu–16Sn–0.3Ti alloy is the key raw material for preparation of Nb3Sn superconducting wires. In this work, non-segregation powders were successfully prepared by using vacuum induction melting inert gas atomization (VIGA) method and homogenization treatment in vacuum. The segregated solidification behavior atomized droplets during atomization, interface segregation atomic diffusion investigated. results show that occurs form twinned spherical segment. A critical morphological...
Magnetic field shimming of the magnet is a routine practice in magnetic resonance imaging (MRI) system. For clinically-used 1.5 T or 3 MRI superconducting magnets, it generally straightforward to achieve desired uniformity with passive shim technique. In comparison, shims higher efficiency are usually introduced combination satisfy requirement for ultrahigh magnets (≥7 Tesla). However, involves complex winding structure and low-temperature environment, bringing considerable engineering...
In the past decade, remotely controlled catheter ablation has emerged as a novel approach to reduce fluoroscopy exposure and provide stable reproducible movement during cardiac surgeries for arrhythmias, many groups have obtained very promising achievements in this research field. Meanwhile, magnetic navigation system (MNS) is competitive among these systems since there are no moving parts magnet system. A MNS that provides real-time of beating heat under development Institute Electrical...
A whole-body high-field MRI magnet is being constructed. compensation solenoid method was employed to design the coil configuration for magnet. In order manage mechanical stress, we sectioned long into six windings, and they were wound on five aluminum alloy mandrels. Four coils outside of windings compensate field inhomogeneity imaging region. Preliminary analysis used by a simplified has been conducted estimate stress levels deformations. Furthermore, finite-element (FEM) obtain...
In order to analyze the physical field distribution during electromagnetic coil propulsion process and possible reasons for failure of insulation structure, a numerical model Electromagnetic Coil Launcher (EMCL) in multi-physical environment was established calculation, damage characteristics driving structure after emission test were analyzed. The results showed that middle area Z-direction inner walls skeleton experienced relatively high stress strain amplitudes. main cause is generation...
This article is based on the local modeling method of rail reverse motion to solve sliding electrical contact problem. The penalty function application entry end face (nonequipotential surface) and rail–armature interface under technical system derived. Only performed near domain, which greatly reduces amount computation. Through numerical difference technique, it allowed move number noninteger meshes at each time step. does not require mesh reconstruction, element stiffness matrix only...