Quench Protection for the MICE Cooling Channel Coupling Magnet

• Published in: IEEE transactions on applied superconductivity Vol. 19; no. 3; pp. 1360 - 1363
• Main Authors: Guo, X.L., Xu, F.Y., Wang, L., Green, M.A., Pan, H., Wu, H., Liu, X.K., Jia, X., Amm, K.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01.06.2009; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Channels; Coiling; Coils; Connection and protection apparatus; Cooling; Cooling systems; Couplings; Diodes; Electrical engineering. Electrical power engineering; Electromagnets; Electronic equipment and fabrication. Passive components, printed wiring boards, connectics; Electronics; Exact sciences and technology; Ionization; Joining; Land surface temperature; Mesons; Mice; Passive quench protection; Protection; quench back; Resistors; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Spreads; subdivision protection; Subdivisions; superconducting magnets; Various equipment and components; Cooling; Propagation velocity; quench back; Diode; Thermal management (packaging); Shunt; Magnet; Hot spot; subdivision protection; Protective device; Passive system; Experimental study; Damage prevention; Superconducting magnet; Ionization; Cooling system; Passive quench protection; Resistor; superconducting magnets
• ISSN: 1051-8223; 1558-2515
• DOI: 10.1109/TASC.2009.2018054

This paper describes the passive quench protection system selected for the muon ionization cooling experiment (MICE) cooling channel coupling magnet. The MICE coupling magnet will employ two methods of quench protection simultaneously. The most important method of quench protection in the coupling magnet is the subdivision of the coil. Cold diodes and resistors are put across the subdivisions to reduce both the voltage to ground and the hot-spot temperature. The second method of quench protection is quench-back from the mandrel, which speeds up the spread of the normal region within the coils. Combining quench back with coil subdivision will reduce the hot spot temperature further. This paper explores the effect on the quench process of the number of coil sub-divisions, the quench propagation velocity within the magnet, and the shunt resistance.