High Magnetic Field Cryogenic Coil for the Frascati Tokamak Transformer
The Frascati Tokamak transformer is made up of a system of coils magnetically linked with the toroidal plasma column of the machine.
The main element of this setup is a 1.2 m long solenoid, inner diameter 0.3 m, outer diameter 0.7 m, designed at Frascati and already built.
The flux density on the solenoid centerline, at a 31 kA current, is 17 Tesla. The energy stored in the transformer 30 MJ.
The current variation produced opening a commutating switch generates a maximum voltage of 40 kV across the transformer, of this about 28 kV across the solenoid.
Ionization and heating of the plasma are produced by the corresponding emf induced along the plasma column.
Liquid nitrogen cooling is employed in order to reduce the energy dis sipation during the current build-up.
KeywordsLiquid Nitrogen Cool Total Magnetic Flux Mylar Sheet Magnetic Flux Line Conductor Current Density
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- 1.R. Andreani, L. Lovisetto, G. Vittadini: Int. Conf. on “Energy Storage, Compression, and Switching”, Torino, November, 5–7 1974.Google Scholar