A Compact Explosive-Driven Flux Compression Generator for Reproducibly Generating Multimegagauss Fields

Explosive-driven magnetic flux generator is one of the most efficient techniques for producing ultrahigh magnetic fields in a relatively large volume. To create a more reliable system suitable for extreme magnetic fields applications, a compact explosive-driven magnetic flux compression system with a small amount of explosive for generating multimegagauss fields was developed. In this paper, the design for reproducibly generating megagauss fields, and the experimental results of this generator are presented in detail. The experimental results show that peak fields in the range of 580-710 T can be reliably generated by the generator with about 3-kg Comp-B explosive.

I. Introduction

Explosive-driven magnetic flux generator (EMFG) for ultrahigh magnetic fields is a quick implosion of a cylindrical conducting liner in which the initial magnetic flux was produced. The liner is surrounded outside with an annular high explosive charge whose detonation over the outer cylindrical surface forms an imploding shock wave compressing the liner (Fig. 1). The implosion process is so quick that most of the magnetic flux inside the liner has not enough time to escape, and will be compressed into a small volume near the axis of the liner and to realize ultrahigh magnetic fields [1] Fig. 1.

Schematic of explosive-driven magnetic flux compression generator.