Theoretical model of a cold mass strap suspension system for superconducting magnets

Strap suspension structures are widely used in superconducting magnet systems for high strength and low heat leak. A theoretical model is developed to design and analyze strap suspension structures. The supported cold mass, the tensile stress due to a cooldown, and a quasi-static acceleration load are considered in the model. In addition, the load conditions during transportation and operating the superconducting magnet system are analyzed. Design rules composed of mechanical strength, minimum resonant frequency, and heat load are presented. A suspension structure consisting of eight strap assemblies for a superconducting magnet is analyzed based on the model. The maximum pretension force is calculated, and the allowable accelerations for the maximum pretension are given. The vertical dynamic performance is better than the horizontal directions for the given strap configuration.