LONG-LIFE PULSED HIGH-FIELD MAGNETS WITH CUAG CONDUCTOR AND INTERNAL REINFORCEMENT

Several pulsed high field magnets for the pulsed field facilities in A ustralia and Belgium were developed and tested. Based on the requireme nts of a long life and a regular use at 60 T, the conductor was chosen to be CuAg with Kapton insulation. This conductor was developed by th e NRIM, Japan and is presently produced by Showa, Japan. It offers a g ood combination of conductivity and strength and is available with lar ge cross sections. As a first step, a prototype with 17 mm bore and al pha = 4.8 with conventional Internal glass fibre reinforcement was mad e and tested up to 62 T. The user magnets have a bore of 22 mm and alp ha = 4.6. Based on the inductance changes during the training, the fie ld limit for normal operation is set at 58 T. In a next step, a 12 mm bore alpha = 7 magnet was fabricated using carbon fibre as internal re inforcement and a held of 69 T was obtained. The combination with carb on fibre thus opens the possibility; of further increasing the peak he ld of the larger bore magnets. Details of the design criteria and cons truction of the magnet will be presented.