Mechanical Behavior of the Cold Mass Assembly of the R3B-GLAD Magnet

The R3B-GLAD magnet is a large acceptance superconducting dipole magnet. It provides the magnetic field needed for the R3B (Reaction studies with Radioactive Relativistic Beams) experiment which will be implemented on the future FAIR Facility (Facility for Antiproton and Ion Research). The cold mass structure of the magnet is designed to hold the six superconducting coils in position and to resist high level magnetic forces. The cold mass assembly consists of coils, coil casings and linking components. It is supported by the three cold to warm supports. It weighs about 20 tons with envelope dimensions of 3 rm(rL) X 5 rm(rW) X 3 rm(rH). Engineering design of the cold mass structure has been carried out through extensive finite element analyses. This paper gives an overview on the mechanical behavior of the cold mass assembly during energizing phase and cool-down phase.