High magnetic field generation using single-turn coils

The advent of the homopolar generator has recently permitted the demonstration of a 20 T on-axis, single turn toroidal magnet. Homopolar generators are inherently high current, low-voltage machines which ideally match the requirements of single-turn coils. Magnetic field levels previously limited by the insulation's thermal and voltage breakdown capability have been surpassed. The entire coil volume is essentially occupied by high strength, high conductivity conductor. A current density of 840 MA/m/sup 2/ has been achieved in a 9 cm major radius, toroidal coil with a 9.14 MA, 56 V open-current discharge (sinusoidal pulse, 150 ms). Experimental test results are presented, as well as discussion of the potential for applying this technology to solenoid-type coils. This research is funded by the Texas Atomic Energy Research Foundation.< >