Dependence of Levitation Force on Frequency of an Oscillating Magnetic Levitation Field in a Bulk YBCO Superconductor

TL;DR

This study investigates how the frequency of an oscillating magnetic field affects the levitation force in a YBCO superconductor, finding that the required magnetic field strength remains constant across 10-300 Hz, aligning with theoretical predictions.

Contribution

It demonstrates that the levitation field strength in a YBCO superconductor is independent of frequency within 10-300 Hz, challenging the significance of hysteretic losses predicted by Bean's model.

Findings

Magnetic field strength for levitation is frequency-independent between 10 and 300 Hz.

Experimental data aligns with theoretical models, showing minimal hysteretic effects.

Hysteretic losses do not significantly influence levitation field requirements in the studied frequency range.

Abstract

The dependence of the magnetic field strength required for levitation of a melt textured, single domain YBCO superconductor disc on the frequency of the current generating the levitating magnetic field has been investigated. The magnetic field strength is found to be independent of frequency between 10 and 300 Hz. This required field strength is found to be in good experimental and theoretical[1] agreement with the field strength required to levitate the same superconductor with a non-oscillating magnetic field. Hysteretic losses within the superconductor predicted by Bean's critical-state model[2] were also calculated. The measured data rules out any significant Bean's model effects on the required levitation field strength within the measured frequency range.