This paper presents a simple but complete 2D model for helical flux-compression generators that overcomes many of the limitations present in existing zero-dimensional models. The generator circuit is effectively decomposed into separate z and; current carrying circuits, with each of the; circuits (rings) corresponding to a different current. Use is also made of a technique by which these rings are sequentially switched out of circuit. The approach proposed opens the way to a full understanding of the behavior of cascade systems of generators inductively coupled by dynamic transformers using the so-called flux-trapping technique. In addition, the model can also yield an important insight into the phenomena that differentiates the performance of small generators when primed by a capacitor, a battery, or an externally produced magnetic field. Finally, the numerical code developed in the paper can readily be adapted to model high-energy and high-current generators in which the helical coil and the armature are of variable geometry. Valuable design information is provided on the magnetic and the electric field distributions within the generator and on the likely radial and axial movements of the stator turns.

This paper describes the culmination of a research activity intended to demonstrate unequivocally that in a launcher, electrostatic to kinetic energy conversion can be achieved with an efficiency exceeding 50%. Two numerical models are presented, with the first of these being a fast and simple method of establishing the optimum launcher design. The second model is based on detailed filamentary considerations, and for the first time highlights the various factors that limit the global efficiency. Results from the detailed modelling are shown to be in very good agreement with experimentally obtained data.

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This paper presents a detailed two-dimensional model for high-voltage air-cored pulse transformers of two quite different designs. A filamentary technique takes magnetic diffusion fully into account and enables the resistances and self and mutual inductances that are effective under fast transient conditions to be calculated. Very good agreement between calculated and measured results for typical transformers has been obtained in several cases, and the model is now regularly used in the design of compact high-power sources.

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This paper describes a novel and miniature probe for monitoring the velocity of the phase transition in aluminium powder under shock loading. Experimental results are presented that could suggest an explanation for the phenomena that are involved, and the possible consequences of these on the design of flux-compression generators are discussed.

Library of Congress Cataloging-in-Publication Data Magnetocumulative generators I Larry L. Altgilbers ... [et al.] p. cm. -(High pressure shock compression of condensed matter)Inc1udes bibliographical references and index.