A5074808479- Physics of Superconductivity and Magnetism
- Superconducting Materials and Applications
- Magnetic Bearings and Levitation Dynamics
- Superconductivity in MgB2 and Alloys
- Magnetic and transport properties of perovskites and related materials
- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- HVDC Systems and Fault Protection
- Frequency Control in Power Systems
- Magnetic confinement fusion research
- Magnetic Properties and Applications
- Magneto-Optical Properties and Applications
- Particle physics theoretical and experimental studies
- Spacecraft and Cryogenic Technologies
- Advanced Condensed Matter Physics
- Magnetic properties of thin films
- Magnetic Properties of Alloys
- High-Voltage Power Transmission Systems
- Advanced NMR Techniques and Applications
- ZnO doping and properties
- Quantum, superfluid, helium dynamics
- Vibration and Dynamic Analysis
- High-Energy Particle Collisions Research
- Thermal Analysis in Power Transmission
- Advanced Fiber Optic Sensors
State University of New York
2022-2023
Stony Brook University
2021-2023
Brookhaven National Laboratory
2017-2021
Michigan State University
2014-2020
Supercon (United States)
2017
Facility for Rare Isotope Beams
2017
GE Global Research (United States)
2011
National High Magnetic Field Laboratory
2009-2010
Florida State University
2008-2010
Florida A&M University - Florida State University College of Engineering
2009-2010
<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> High-field superconducting solenoids have proven themselves to be of great value scientific research in a number fields, including chemistry, physics and biology. Present-day magnets take advantage the high-field properties <formula formulatype="inline"><tex>${\hbox{Nb}}_{3}{\hbox{Sn}}$</tex> </formula>, but limits this conductor are nearly reached so new magnet technology is necessary for beyond...
An equivalent circuit grid (ECG) model is proposed to analyse the time-varying characteristics of no-insulation (NI) ReBCO pancake coils. In model, each turn coil subdivided into fine elements in azimuthal direction, and element a parameter. Then, grid. A math based on Kirchhoff's law solve model. The distribution electrical current inside NI analysed for charging discharging process. finite method (FEM) coupled calculate magnetic field induced by coil. To validate double (DP) fabricated...
The second-generation high-temperature superconductor (2G HTS), Re-Ba-Cu-O coated conductors are known for strong mechanical properties and have numerous potential applications in high magnetic field research electrical power systems. It has been noted the community that can be prone to performance degradation on thermal cycling when used epoxy impregnated magnet windings. This tied <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</i> -axis peel...
This paper is to study ramping turn-to-turn loss and magnetization of a no-insulation (NI) high temperature superconductor (HTS) pancake coil wound with (RE)Ba2Cu3Ox (REBCO) conductors. For insulated (INS) HTS coils, occurs on superconducting layers during operation. the NI coil, additional generated by “bypassing” current metallic contacts, which called “turn-to-turn loss” in this study. Therefore, coil's much different from that INS but few studies have been reported aspect. To analyze...
An update high temperature superconducting Maglev measurement system (SCML-02) was successfully developed. The includes liquid nitrogen vessel, cylinder permanent magnet (PM) or PM guideway (PMG), data collection and processing, mechanical drive autocontrol. vessel with superconductors (HTSCs) can be placed above under the PM. This has other characteristics: precision, instant at movement of measured HTSCs specimen, synchronous levitation guidance, in three dimensions one time, relaxation...
The quench behavior of conduction-cooled Y Ba2Cu3O7?? (YBCO) coated conductor pancake coils is reported. Two coils, one stabilized with copper and brass, are wound 25?m instrumented a heater large number voltage taps thermocouples. critical current, minimum energy (MQE) two-dimensional normal zone propagation velocity (NZPV) measured as function I/Ic, where I the transport current Ic current. Although non-uniform temperature self-field distributions within result in Ic, able to induce...
YBa <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Cu xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> O xmlns:xlink="http://www.w3.org/1999/xlink">7-</sub> <i xmlns:xlink="http://www.w3.org/1999/xlink">x</i> (YBCO) coated conductors (CCs) are now capable of carrying very high transport critical current density xmlns:xlink="http://www.w3.org/1999/xlink">Jc</i> over a broad range magnetic field and temperature space, as result, they...
High temperature superconductor (HTS) no-electrical-insulation (NEI) coils demonstrate great advantages in thermal stability and self-protection features. However, an intrinsic delay is observed the charging process as a result there maybe possible settle-out problem. It becomes more critical for large HTS with turns, such magnets accelerator system DC induction heater applications. This paper presents detailed studies on characteristics of NEI coils. Firstly, two different are wound: first...
This paper presents a study on the ramping losses of high temperature superconductor (HTS) magnet consisting multiple no-insulation (NI) (RE)Ba2Cu3Ox coils. The (REBCO) conductor is second generation HTS thin tape, where RE stands for rare-earth. During operation NI magnet, are generated both across turn-to-turn resistances and inside superconducting layers. former comes with radial current, which called “turn-to-turn loss;” latter one induced by flux creep jump, “magnetization loss.”...
The first man-loading high-temperature superconducting (HTS) Maglev test vehicle in the world was successfully developed on Dec. 31, 2000 Applied Superconductivity Laboratory, Southwest Jiaotong University, China. Heretofore over 24 500 passengers took vehicle, and it has been operating back forth for about 400 km. HTS provides inherent stability both vertical lateral direction, so no control system is needed. only used linear motor driving devices. melt-textured YBaCuO bulk superconductors...
After the levitation force relaxation was studied for different field-cooling height and working-levitation height, high-temperature superconductor (HTS) bulk horizontally moved in lateral direction above permanent magnet guideway. Both guidance were collected by measurement system at same time. It found that decay of is dependent on both maximum displacement movement cycle times, while hysteresis curve does not change after first cycle. This work provided scientific analysis HTS maglev design.
Free vibration of the high temperature superconducting (HTS) Maglev vehicle model has been investigated after an impulse force over permanent magnet guideway. The was used to simulate external disturbances on HTS so as study its characteristics. In experiments, free curves time dependence acceleration and frequency displacement were measured. It found that some damped which seemed decrease exponentially. Applying response dynamic equation model, stiffness damping coefficient evaluated....
In order to design high temperature superconducting (HTS) maglev launch system, three NdFeB permanent magnetic guideways (PMGs) are investigated and compared for the better levitation forces guidance forces. The laboratory-scale HTS system was designed developed successfully in Applied Superconductivity Laboratory (ASCLab), Southwest Jiaotong University, China. cooling process of melt-textured YBaCuO bulk superconductors is made a big low tube, which connected with PMG. method merit...
This paper studies simulations of charging and discharging characteristics in a magnet system which has seven double pancake coils on the same axis is made (RE)Ba <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Cu xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> O xmlns:xlink="http://www.w3.org/1999/xlink">7-x</sub> conductor using no-insulation winding approach. A numerical circuit network model developed to take turn-to-turn contact...
Cooling of beams gold ions using electron bunches accelerated with radio-frequency systems was recently experimentally demonstrated in the Relativistic Heavy Ion Collider at Brookhaven National Laboratory. Such an approach is new and opens possibility this technique higher energies than possible electrostatic acceleration beams. The challenges include generation suitable for cooling, delivery required quality to cooling sections without degradation beam angular divergence energy spread,...
We explored high magnetic field superconducting properties and stability at 4.2 K of Second Generation High Temperature Superconductors using both short conductors small pancake coils. Short lengths conductor were tested 0-25 T in parallel perpendicular fields, demonstrating an overall critical current 420 A/mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> a 25 T. A 56 m length wire was carefully characterized for performance along the...
A 1-MW industrial-scale high-temperature superconductor (HTS) dc induction heater is being designed and manufactured in Shanghai Jiao Tong University, China. This paper to present the design engineering analysis of a HTS magnet with iron yoke for this heater. generate 0.5-T magnetic field iron's air gap, where billet rotated. To enhance thermal stability, no-insulation (NI) coil metallic insulation (MI) (co-wind stainless steel strips) introduced magnet. The influence NI&MI technique on...
With the successful test of first two pre-series magnets US HL-LHC Accelerator Upgrade Project has started production MQXFA to be used in Q1/Q3 inner triplet elements HL-LHC. This good start comes after prototypes with limited performance, and it demonstrates importance learning from past issues. Therefore, this paper we want share most important lessons learned so far, focusing on those which may more interesting for similar projects. We will also present status fabrication US.
AC loss is one of the critical issues for designing REBCO fast-ramping magnets operating at cryogenic temperatures. There are many ways to reduce coil windings. However, it not clear which method most effective way minimize in windings a given Ampere-turns. In this work, we numerically studied configurations several small superconducting constructed from 12 mm SuperPower coated conductors, application with same Ampere-turns identify lowest among them. The HTS have total turn number 50 and...
Since the first successful running of people-carrying high temperature superconducting (HTS) Maglev test vehicle on 31 December 2000, about 27 000 people have taken it, and accumulated distance is 400 km. The levitation force onboard HTS equipment measured periodically, new experimental results 5 March 2003 show that performance almost same as two years ago. Experimental indicate long-term stability good. This further proves feasibility for practical transportation. It worth mentioning all...
YBa2Cu3O7−δ (YBCO) coated conductors carry high critical current density with the potential for low cost and thus have a broad range of applications. An unresolved issue that could inhibit implementation, however, is lack understanding redistribution normal zone propagation behavior in event thermal disturbance (quench). In this work, we first time present real-time, dynamic observation magnetic field during via magneto-optical imaging speed, resolution CCD (charge coupled device) camera....
The development of superconducting magnets requires not only a conductor that is capable carrying sufficient critical current density (Jc) at high magnetic field, but also one mechanically robust and predictable. Here, the electromechanical behavior AgMg sheathed Bi2Sr2CaCu2O8 + x (Bi2212) round wires YBa2Cu3O7 − δ (YBCO) coated conductors studied using statistical approach based upon three-parameter Weibull statistics, where three parameters α, β, γ describe scale, shape location resulting...
Guidance force is calculated when a high-temperature superconductor moves laterally on permanent magnetic guideway. Both the and guideway are infinitely long. The dependence of guidance performance upon both geometrical parameters, such as shape guideway, intrinsic critical current density uniform magnetization studied. results may be helpful to design optimization superconducting magnetically levitated train system.
An test coil was manufactured and tested as the first step in development of a 3 T MgB <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> magnet system. Due to fact that has higher critical temperature, replacing conventional NbTi superconductor with , temperature operation will be possible. It make cryogenic design much simpler less expensive. Furthermore, operating at results larger heat capacity materials surrounding structures. Higher...