Simultaneous Measurement of the Lifting Force, Joule Heating and Axial/Radial Components of EM Field Inside an Electromagnetic Levitation Coil

Electromagnetic levitation (EML) is a prospective method for the growth of high-purity crystals. There are separate measurements of axial EM field along the z-axis, lifting force, and total emitted heat for EML coils, but these values have not yet been measured simultaneously. Additionally, distribution of the heat emission should be considered in EML coil design. It was recently shown that 3D models of EML coils produce significantly different results in comparison to 2D approximations. Experimental measurements are needed to verify and improve theoretical models. In this paper, we present a method for simultaneously measuring lifting force, distribution of Joule heating along the z-axis for a conductive sample inside an EML coil, as well as axial and radial components of the EM field around the sample. This paper includes measurement results for a cylindrical Al sample inside an EML coil with 3 turns and 1 counterturn, but the method should be applicable to different types of samples and EML coil geometries.