Design and analysis of cold mass support system for superconducting magnets without transport protection

Abstract

For the superconducting magnets that require high environmental adaptability during unprotected long-distance transportation, the cold mass support structure must have sufficient rigidity to minimize the variation of coaxiality between the cold mass and the warm bore after transportation. Based on the T700 carbon fiber reinforced plastic (CFRP) with low thermal conductivity and high mechanical strength, a three-dimensional adjustable cold mass support structure is constructed. To monitor the tension forces of the rods and the displacement of the cold mass, the tension sensors and the displacement sensors are integrated into this structure. The support structure is analysed for conductive heat leak, structural strength and stability under vibration. The effects of highway transportation on the displacement of the cold mass and the stress of the rods are studied by vibration experiment. Additionally, the situation of the cold mass may still change under the long-term accumulation of transportation. An adjustment method of the displacement is proposed to solve this problem. The result shows that the displacement of the cold mass is less than 0.01 mm after the vibration experiment. The coaxiality error can be adjusted within 0.1 mm. The rods can support the stress during vibration. The design of the support structure is reasonable and reliable.