Development of Pulsed Magnets at WHMFC

Peng, Tao; Li, L; Herlach, F.

doi:10.1109/tasc.2010.2041918

Cited by 12 publications

(5 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The magnet is immersed in liquid nitrogen and pre-cooled to 77 K before discharge. During the discharge process, the resistance of the magnet coil will rise due to the Joule heat, which means the variation of the resistance cannot be overlooked in the analysis of the FTMF system [19]. In addition to Joule heat, the magneto-resistive effect and the skin effect also affect the coil resistance during the pulse generation.…”

Section: B Pulsed Magnetmentioning

confidence: 99%

Generation of a Flat-Top Magnetic Field With Multiple-Capacitor Power Supply

Ding

Fang

et al. 2022

IEEE Access

View full text Add to dashboard Cite

The flat-top magnetic field (FTMF) can meet scientific experimental requirements for higher magnetic intensity, longer flat-top pulse width, and lower ripple in physics, chemistry, biology, and other scientific fields. This paper proposes an FTMF system powered by the multiple-capacitor power supply (MCPS). The MCPS consists of several capacitor banks with customizable capacitance and given voltage. These banks discharge sequentially based on the designed time-series to yield an FTMF. Compared with other methods for generating the FTMF, the MCPS can easily generate FTMFs with high parameters and flexible adjustability of the pulse width. Due to the coupled variable parameters between and within the power supply and the magnet, a hybrid algorithm based on the genetic algorithm (GA) and particle swarm optimization (PSO) is applied to calculate the discharge parameters of the MCPS. The optimal solution from the GA-PSO hybrid algorithm is visualized and selected by the basis vector method. For verifying the effectiveness of the MCPS and the optimization method, a series of FTMFs at different magnetic field strength levels are modeled in MATLAB/Simulink and achieved in the experiment. The generated FTMF with the highest field strength is 50 T, its pulse width is 70 ms, and ripple is less than 0.7%.INDEX TERMS Flat-top high magnetic field, multiple-capacitor power supply, multi-objective optimization, GA-PSO hybrid algorithm.

show abstract

Section: B Pulsed Magnetmentioning

confidence: 99%

Generation of a Flat-Top Magnetic Field With Multiple-Capacitor Power Supply

Ding

Fang

et al. 2022

IEEE Access

View full text Add to dashboard Cite

show abstract

“…With the redistributed axial force load, the axial force balance equation in each CP can be obtained respectively as (14) and the axial strain of each CP ε zi can be calculated by solving the axial force balance equation (14) in each CP together with the stress equilibrium in (7). In the MPS model, the axial strain in a thick MIU is a radially discrete variable, which is an approximation of the continuously varying axial strain caused by the bending.…”

Section: A Magnetic Field and Lorentz Forcementioning

confidence: 99%

“…Substituting the constitutive relation (6) and strain displacement relation (10) into the stress equilibrium equations (7) and (14), the stress equations for each MIU can be obtained as where D ij are the elements in the constitutive matrix, B z the z component of the magnetic field, J θ the current density of the conductor layer, and all of them are varying with radius. m is the number of CPs in the MIU, ε zi the uniform axial strain of the ith CP, and F zi the correspondent axial force load in the ith CP.…”

Section: Finite Element Modelingmentioning

confidence: 99%

A Modified Mechanical Model for the Optimization of High Field Solenoid Magnets

Chen

Xiao

et al. 2020

IEEE Access

View full text Add to dashboard Cite

A modified mechanical model for the stress analysis of solenoid pulsed magnets is presented, which includes the influence of bending on the plane stress analysis. The bending effect in the axial direction is included by introducing the discrete axial strain with the assumption of the uniform distribution of the axial force load. The modified model improves the accuracy remarkably compared to the classical Generalized Plane Strain (GPS) analysis. The results are verified with the FEA software. The algorithm of identifying the optimum positions of the separations between windings is also proposed. This model achieves both high efficiency and high precision, which are of great significance to optimize high field solenoid pulsed magnets and explore the existing potential for higher magnetic fields. INDEX TERMS Bending, high magnetic field, pulsed magnet, separation, stress analysis.

show abstract

“…The two 0.8 MJ modules can deliver 100 kA in parallel, this is intended for the inner coils of multi-coil magnets. All modules are equipped with knife switches for connection to magnets consisting of up to three coils [3]. The pulse generator is used for the 50 T long pulse magnet to produce a 100 ms flat-top field.…”

Section: Introductionmentioning

confidence: 99%

Magnet Development Program at the WHMFC

Peng

Xiao

et al. 2012

IEEE Trans. Appl. Supercond.

View full text Add to dashboard Cite

In 2008, the Wuhan National High Magnetic Field Center (WHMFC) was set up at the Huazhong University of Science and Technology, Wuhan, China. The objective of the pulsed magnet program is to produce pulsed magnetic fields in the range of 50 to 80 T. The following pulsed magnets were initially conceived: 1) 50-80 T monolithic magnets energized by one or a few modules of the 1 MJ capacitor bank, 2) a 50 T/100 ms flattop long pulse magnet energized by the 100 MJ/100 MVA pulse generator, 3) a 60 T/200 ms long pulse magnet energized by the 12 MJ capacitor bank, and 4) an 80 T dual coil system energized by two capacitor bank modules. In addition, a 16 T PPMS and a 7 T SQUID-VSM systems were acquired. Currently, work on a 40 T long pulse magnet energized by lead acid battery units and the acquisition of a 400 MHz NMR spectrometer are in progress.

show abstract

Development of Pulsed Magnets at WHMFC

Cited by 12 publications

References 11 publications

Generation of a Flat-Top Magnetic Field With Multiple-Capacitor Power Supply

Generation of a Flat-Top Magnetic Field With Multiple-Capacitor Power Supply

A Modified Mechanical Model for the Optimization of High Field Solenoid Magnets

Magnet Development Program at the WHMFC

Contact Info

Product

Resources

About