Design Options for a Magnet Support Column in the Cryostat of a Hybrid Magnet System

摘要

In a hybrid magnet system, wherein superconducting and resistive magnet technologies are combined for attainment of the highest steady fields, a major design driver is the potential for extremely large realignment forces between the magnets should one fail, which is not an uncommon occurrence for the resistive magnet. A viable approach is to use a very strong and stiff structure, which typically requires the designer to deal with a large cross-section in the heat-conduction path and emphasizes the importance of optimizing this component through materials choices, distribution of heat intercepts, and configuration. As an example, the superconducting outsert of the present 45-T Hybrid sits atop a rugged, cylindrical support column with heat intercepts at 80 and 20 K and variation of the column's wall thickness for sections in each temperature range. In this paper, we describe several practical design alternatives, compare their projected mechanical and thermal performance to the structure in the present 45-T Hybrid, and present test results from a model of one of the more promising options.