High-Power Water-Cooled Magnets in Tohoku University(Part II. Several Instruments and Techniques Developed in HFLSM)

Design, fabrication and operating results of water-cooled magnets at High Field Laboratory for Superconducting Materials in the Research Institute for Iron, Steel and Other Metals are described. The four of the eight magnets are used for hybrid magnets, and others are for single operation. Details are shown for the two magnets : one is a combined magnet named WM-4 consisting of an inner polyhelix coil and an outer Bitter-type coil which is designed to produce the magnetic fields up to 20 T in a 32 mm working bore, and the other is a single Bitter magnet named WM-5 which generates the magnetic fields up to 15 T in a 82 mm bore. This is useful for the measurement of AC loss of superconductors because of the large experimental area and the uniformity of field strength. The calculation of field distribution of the water-cooled magnets, including ones for the hybrid magnets, is also described