Cooldown and warmup thermal analysis of the mirror fusion test facility (MFTF) superconducting magnet

General Dynamics Convair Division has performed a series of detailed cooldown and warmup thermal analyses to support the design of the Lawrence Livermore Laboratory (LLL), Mirror Fusion Test Facility (MFTF) magnet system. The analyses were conducted under LLL Contract 9815603. All analysis objectives were achieved, including definition of a cooldown and warmup operating schedule which can (1) effect complete cooldown and warmup within three to five days (an LLL requirement), (2) yield acceptable levels of thermally-induced stresses resulting from transverse and longitudinal structural temperature differentials, and (3) yield acceptable stress levels with or without flow imbalances in separate sections of the magnet. The analyses were executed through the National magnetic Fusion Energy Computer Center (NMFECC) at LLL