Seven superconducting focusing magnets have been constructed for verti
cal gyrotrons devoted to the plasma heating of the tokomak Tore Supra.
The performances in magnetic field strength, profile and homogeneity
are spread over a large range so as to suit gyrotrons of microwave fre
quencies extending from 110 GHz to 150 GHz. The cryostats have a low c
onsumption in cryogenic fluids which insure a one week autonomy.