ADVANCES IN MEGAGAUSS FIELD GENERATION AND APPLICATION AT ISSP

Abstract

We report recent progress in the generation and application of megagauss fields at the new Megagauss Laboratory of ISSP in Kashiwa. New facilities for studying physics in ultra-high magnetic fields were built at the new campus of the University of Tokyo at Kashiwa, where pulsed high magnetic fields are produced by three different techniques: electromagnetic flux compression, the single-turn coil technique and non-destructive long pulse magnets. Considerable progress has been made in each of these techniques, as compared with the old facilities at Roppongi. For electromagnetic flux compression, the rise time of the primary current was reduced by decreasing the residual inductance of the capacitor bank. The cylindrical symmetry of the liner implosion was remarkably improved by inserting a "feed gap compensator" between the primary coil and the liner. So far, a maximum field of 622T has been achieved. By the single-turn coil technique, very high fields exceeding 300T have been obtained depending on the coil bore, in two systems with horizontal and vertical coil axes. These fields are successfully applied in many different kinds of experiments. Non-destructive long pulse fields up to 60T are available from wire-wound coils.