Reversible Energy Transfer between Inductances
Repeatedly-pulsed magnetic fields of the order of 10 GJ with rise times of 10 ms, as they would be used in a theta-pinch fusion reactor, need energy storage and transfer devices of high efficiency. Inductive storage would be favourable but needs a suitable transfer system. The transfer device must be capable of storing about half the total energy during transfer. Two possibilities are suggested, both using kinetic energy as interim storage. One is a homopolar machine, in lieu of a capacitor, and operates with liquid metal as the only movable medium. The other is switchless and works on the principle of a single phase alternator; during transfer the rotor performs half a rotation between two unstable equilibrium positions. The feasibility of the liquid metal transfer system will depend on the results of research into the losses; the other system has worked on a small scale in a fully superconducting device.
KeywordsLiquid Metal Hartmann Number Flux Linkage Resistive Loss Transfer Element
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