Increasing the Resistance of Magnetic Flux Concentrator during Generation of Strong Pulsed Magnetic Fields

TL;DR

This paper theoretically investigates methods to enhance the durability and strength of magnetic flux concentrators in pulsed magnetic field generation, achieving a 25% increase in magnetic field amplitude without damaging the concentrator.

Contribution

It introduces a theoretical model for increasing pulsed magnetic field strength by optimizing inductor system parameters and material properties without causing low-cycle fatigue.

Findings

Magnetic field amplitude can be increased by about 25%.

Steel concentrators' resistance variation enhances durability.

The model predicts safe operation limits for pulsed magnetic fields.

Abstract

The possibility of significant increase of generated pulsed magnetic fields by the inductor system of a single-turn solenoid and magnetic flux concentrator without initialization of low-cycle fatigue mechanism is theoretically studied by varying the size of the inductor system, the material of the concentrator and the parameters of the discharge circuit. The analysis is carried out on the basis of self-consistent solution of the equation, which describes dynamics of the discharge electric circuit, with equations describing spatial distributions of magnetic and temperature fields, mechanical stresses and deformations in the inductor and concentrator. It is shown that for traditionally used steel concentrators by varying the electrical resistance of the circuit it is possible to increase the amplitude of generated pulsed magnetic fields without the threat of concentrator destruction by about 25~\%, from 32 to 40~T.