A Comparison of the Quench Analysis on an Impregnated Solenoid Magnet Wound on an Aluminum Mandrel Using Three Computer Codes

The magnet used for the quench protection comparison has an ID of 1.5 m. At a maximum current of ~ 210-A, the stored energy is ~13 MJ. The impregnated magnet coil is 281 mm long and about 105.6 mm thick. The coil is wound on a 6061-aluminum mandrel. The magnet quench protection system is passive. The magnet coil is subdivided with back-to-back diodes and resistors across each of the coil subdivision to reduce the magnet internal voltages. Conservative quench protection criteria were applied when the magnet was designed. These criteria are presented in this paper. Quench protection of the magnet was simulated using three computer codes from three different places. The results calculated using the three codes are compared to the original magnet quench protection criteria used to design the magnet. The three quench simulation codes assumptions are compared. The calculated hot-spot temperature and peak voltages are compared for the three quench simulation codes.