Buckling analysis of pulsed magnets under high Lorentz force: Fid-Bau Portal

Buckling analysis of pulsed magnets under high Lorentz force

Xiao, Houxiu / Liao, Junkai / Chen, Xianfei / Li, Xiaofeng / Wang, Pengbo / Peng, Tao / Li, Liang

Abstract The buckling behavior of the windings of pulsed magnets is analyzed systematically for the first time. The buckling analysis of a pulsed magnet is a complicated problem from the material properties to the geometry and the Lorentz force load. Each layer of the magnet is a composite of a helical conductor winding and a layer of orthotropic fiber. Pulsed magnets are compressed axially and expanded radially simultaneously by the Lorentz force, which is distributed in the whole magnet. The structural properties of the windings are discussed by the linear buckling analysis at first, where the Lorentz force is replaced by axial compressed force applied at the ends of cylinders. Then a more comprehensive analysis that includes all the above factors is presented by the nonlinear buckling model in the ANSYS software. The results show that pulsed magnets have a high risk of buckling. The results also indicate many other valuable conclusions, and even some conclusions will subvert the traditional cognition for the pulsed magnet designing. All these results will promote the pulsed magnet technology, and lay the foundation for the theory of pulsed magnets of ultra-high field.

Highlights • The first study of the buckling analysis of pulsed magnets, which is the key to the design of pulsed magnets. • A comprehensive, detailed and multi-physics analysis is presented, and a more accurate composite model is established. • Some layers of the magnet have a high risk of buckling, especially for the innermost and middle layers. • The axial critical buckling stress is decreased by the radial Lorentz force and the helix structure of the windings. • Thicker fiber reinforcement may weaken the stability of the windings, which overturns the traditional cognition.