Investigation of Magnetic Force in Metallic Structure of Superconducting Magnet

Abstract

The Weldestien 7-X, a steady state nuclear fusion reactor is being built by Max-Plank-Institute for Plasma Physics, Germany. In this, the superconducting magnets supply the required magnetic field to enclose the plasma. The steel plasma vessel and the helium cooled heat radiation shield are surrounded by superconducting coil. During discharge of the magnetic system, Eddy current is induced in the metallic structure. Due to complex geometry of the structure it is not possible to calculate the exact effect of magnetic force on metallic structure. Therefore, in the present work mainly the magnetic field on and around the metallic structure due to the superconducting coils is analyzed using Ansys – Maxwell software. Using AnsysMaxwelll 15.0, a toroidal metallic structure, surrounded by superconducting coils made up of aluminiumcryo-cooled at about 1 K is prepared. The software uses finite element method to calculate the magnetic force and intensity on metallic structure. The software divides the whole diagram into number of tetrahedral subparts and then solves each tetrahedral subpart in the form of matrices. Mainly the magnetic field on the surface of the metallic structure, the magnetic field vector on and around the surface of the metallic structure, the magnetic field intensity at different important points and sections of the metallic structure is obtained and analyzed. We can also find the vector diagram of magnetic field which clearly shows the direction of current and the intensity of field at each part of metallic structure.