FAST-RISE, LARGE-VOLUME, 1.7-KG MAGNETIC-FIELD COIL

A one-turn coil of 20 cm diameter and 30 cm length produces a field up to 1.7 kG with a rise time of 30 ns. The rate of rise of field, nearl y 6 T/mus, is faster than for any other coil of this size. Powering th e coil is a transformer-charged pulse-forming line machine operating a t up to 28 kA, 280 kV without deleterious arcing. The field is uniform to 5% over the coil length, focusing an electron beam passing along i ts axis.