Design and Construction of a Large Superconducting Spectrometer Magnet
The sector type superconducting spectrometer magnet, SKS, for nuclear physics experiments is under construction by institute for Nuclear Study, University of Tokyo with collaboration from KEK. The central magnetic field is 3 tesla with the magnet gap of 50 cm and the stored energy is 11.2 MJ. Easy operation and maintenance have been taken into consideration in the design. It is intended to make the heat leak as small as 3 W at 4 K. Three dimensional magnetic field calculation and the stress analysis have been performed to design the coil and the supporting structures. The maximum operation current of 500 A is selected by calculating the maximum temperature of the coil at quench. A model coil has been tested to obtain the information on the stability and quench characteristics of die SKS magnet A small refrigerator is to be used for thermal insulation at 80 and 20 K in combination with a medium size refrigerator at 4 K.
KeywordsRefrigeration System Spectrometer Magnet Unbalanced Force Heat Leak Thermal Shield
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