Theoretical and Experimental Study of Explosive Driven Magnetic Field Compression Generators
We describe generators of electrical energy in which magnetic field compression is achieved by a solid explosive. The magnetic flux losses have been calculated for generators of various configurations. There is a good agreement between these calculations and the experimental results for coaxial and “bellows” type generators. In helical generators the magnetic flux losses are higher than those calculated by considering diffusion only. We show by detailed calculations of the motion of the explosive driven inner conductor that additional losses come from the jumps encountered by sliding contact moving along the helix. The jumps are caused by little geometrical defects and the consequence on losses is strongly dependent on current intensity. The jumps are detrimental to the efficient use of the explosive energy. With helical generators only 5 % of the energy is transferred into magnetic energy, to be compared to the computed value of 20 % in the case of bellows generating 15 MA in 40 nH with an e-folding time of 70 μsec.
KeywordsMagnetic Flux Flux Leakage Explosive Energy Geometrical Defect Solid Explosive
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