Polyimide-alumina : an insulator used in a superconductor winding cooled by superfluid helium
The toroidal magnet of TORE SUPRA is made up of 18 coils, each one consisting of a superconducting winding enclosed inside a thick stainless steel casing dedicated to withstand the electromagnetic forces. The superconducting winding is cooled by a superfluid helium bath at 1.8K; the thick casing is cooled by a supercritical helium flow at 4.2K. The chocks between winding and thick casing provide the thermal insulation between 1.8K and 4.2K as well as the transmission of loads from the winding to the casing. To meet these two requirements it proved necessary to develop a new material: polyimide-alumina. The development program resulted in the achievement of an industrial production of this material, which allowed the realisation of the magnet in conformity with the specification.
Bibliographic Reference: Article: Revue Phys. Appl., Vol. 23 (1988), pp. 1761-1765
Record Number: 198910449 / Last updated on: 1994-12-01
Original language: fr
Available languages: fr