Compact explosive-driven generator of primary power based on a longitudinal shock wave demagnetization of hard ferri- and ferromagnets

Abstract

A new type of compact explosive-driven generator of primary power, which utilizes phenomena of a shock wave demagnetization of hard ferri- and ferromagnets, was developed. The shock wave initiated by high explosive, as well as accelerated flyer plate, passes along the hard ferri- or ferromagnetic body, which serves as initial energy carrier. The shock wave demagnetizes the energy-carrying element, reducing the initial magnetic flux /spl Phi//sub 0/. In accordance with Faraday's law, this change of magnetic flux /spl Delta//spl Phi//sub 0/ generates an electromotive force in a coil wound on the energy carrier. Several types of compact generators with energy-carrying element of 10 cm/sup 3/ in volume were explored. High-voltage generators that utilize energy of BaFe/sub 12/O/sub 19/ hard ferrimagnets are capable of producing pulses of amplitude 5.5 kV with full width at half maximum (FWHM) of 1 /spl mu/s. The generators that utilize energy of Nd/sub 2/Fe/sub 14/B high-energy hard ferromagnets are capable of producing pulses with amplitude more than 10 kV and FWHM about 4 /spl mu/s. The high-current generators based on Nd/sub 2/Fe/sub 14/B produced pulses yielded 826 A and FWHM of 180 /spl mu/s. The developed generator can be used as the most reliable and effective source of primary power capable of seeding magnetocumulative generators.