The Toroidal Magnet of FM-1

The construction features of the toroidal field coil for the FM-1 device are described. The coil is rated at 1.5 × 106 ampere-turns steady and has a field volume of 49 cubic meters. The stored energy of the field is nearly 2 MJ. The coil must be taken apart for insertion of a superconducting ring; the techniques for accomplishing this are described.