Characteristics of a Homopolar Machine as a Power Supply for Large Pulsed Magnetic Fields for Fusion Experiments
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Inexpensive and reliable methods of storing and transferring large amounts of energy (>50 MJ) are essential to continued progress in controlled fusion research. One particularly attractive means of doing this, for slow time scale requirements (10-100 sec), is to use a homopolar generator in a pulsed mode of operation. A detailed design study of a 55 MJ homopolar machine to power the toroidal field of the Texas Turbulent Torus is being carried out at The University of Texas. This unit is designed to deliver a peak current of 35 kA, at 210 volts, to the field coils of the Texas Torus in 10 sec. In addition a 0. 7 MJ working bench model of the homopolar machine has been built and is currently being used to test the design of the large unit. These tests include mechanical considerations such as stress, bearing loading, and heating, and electrical considerations such as stability, speed control, and field compensation.