For generating diversified magnetic field waveforms, a flexible control system of Pulsed High Magnetic Field Facility (PHMFF) has been developed at Wuhan national pulsed High Magnetic Field Centre (WHMFC). Firstly, in order to describe various magnetic field systems, a general physical model composed of energy storage modules, load unit, transport circuits, and other auxiliary units is...
In order to meet the needs of scientific research, a Multi-stage Ultrahigh and Magnetic System (MUMS) has been developed at Wuhan national pulsed High Magnetic Field Centre (WHMFC) for generating 100 T magnetic field. Based on multi-stage technology, MUMS is composed of outer, middle and inner coils with three corresponding pulsed power supplies, and the field waveforms from three coils are...
We have succeeded in detecting local obstacles automatically in a 200-m-long RE-123 coated conductor (CC) by introducing deep learning based image recognition in reel-to-reel scanning Hall probe microscopy (RTR-SHPM). Longitudinal Ic homogeneity in CCs is one of the most important requirements for practical applications. Usually, such properties as Ic variation as a function of longitudinal...
For commercial large-scale magnet systems, the transient loss during the ramping process is an important evaluation metrics for refrigeration requirements, that is greatly influenced by contact resistance between winding turns. Due to intrinsic bypass current of no-insulation magnets, two part of the transient loss were considered: turn-to-turn loss generated by radial direction current, and...
An electron cyclotron is to heat a plasma by driving current in a fusion system. This system requires strength and accurate magnetic field distribution for the interaction of the electron beam and radio frequency wave energy. The magnet of the system consists of a conduction-cooled superconducting magnet for 7 T and structures connected with a 2nd stage GM cryo-cooler of 1 W at 4 K for cooling...
A system based on a novel scheme for generating the repetitive pulsed high magnetic field (RPHMF) is developed and applied to enhance the performance of NdFeB electrocatalyst in alkaline water electrolysis for the first time. In this system, the scheme for generating continuously high-frequency pulses depends on the cooperation of multiple power modules with new structure. Multiple power...
We experimentally studied the quench characteristics of coated conductors wound on metal cores spirally. The length of the metal core of each sample was 230 mm. A coated conductor was wound at the center 160 mm section of the core. Current terminals were attached over the coated conductor with 100 mm separation (effective section). Indium was filled in the gap between the current terminal and...
Field pole magnet composed of stacks of high-temperature superconducting (HTS) tapes is a featured technology due to its simple manufacturing process, flexibility, and high current density thanks to intensified characteristic of HTS characteristics.
In this study, our group measured magnetic distribution of rounded stacks of HTS tapes in comparison with flat shaped ones. Normally, critical...
The finite element analysis of electromagnetic coupling between a stainless steel shell and the 100 T pulsed magnet has been developed at the Wuhan National High Magnetic Field Center (WHMFC). The 100 T pulsed magnet consists of inner, middle and outer coil coaxially nested. The stainless steel shell is fitted tightly around the middle coil to resist the strong Lorentz force. The thickness of...
Pb–Bi alloy and Wood's metal have been used for more than 30 years as representative superconducting solder intermedia to establish superconducting joints between NbTi and Nb3Sn wires. However, the use of Pb and Cd has been severely restricted by environmental regulations. The author has developed a novel alternative superconducting joint method between NbTi and Nb3Sn wires without Pb and Cd....
In order to accurately evaluate the reliability of Pulsed High Magnetic Field Facility (PHMFF) at Wuhan national pulsed High Magnetic Field Centre (WHMFC), a reliability analysis method based on Markov chain and reliability block diagram is introduced in the paper. PHMFF is composed of lots of pulsed power modules, magnet coils and its corresponding control system. Based on the hardware of...
Superconducting Magnetic Energy Storage (SMES) has the characteristic of fast response and high power density, which can be used to enhance the stability of power system and improve the power quality. With the increasing capacity of the power system, the application of a single SMES has certain limitations. By integrating individual superconducting magnet unit or SMES unit, modular SMES...
