Devices that convert explosive energy into electromagnetic energy are
often called Flux Compression Generators (FCGs) in the United States,
whereas the term Magnetocumulative Generators (MCGs) is more com- monly
used in Russia. Since the Russian literature is accessed more heavily in
this book, the latter term is used here. In any event, the basic process
involves using explosives to force an initial magnetic flux into a
region of smaller inductance in such a manner that loss of flux is
minimized. In the event that no flux is lost, the magnetic energy
associated with the flux, inversely proportional to the inductance, must
increase. Flux loss is min- imized by confining it with good conductors
which, in turn, are driven rapidly by the explosive to reduce the system
inductance. The magnetic energy is increased by the work the conductors
do as they are forcibly moved against the magnetic field, the energy, in
turn, being supplied by the explosive driving them. As the reader may
infer, there are different kinds of generators, some of which might be
difficult to recognize as MCGs. Nonetheless, they all possess the
features outlined above. Explosives have some unique features as energy
sources. They have very high available energy densities; they release
energy rapidly, or at high power; they can develop very high pressures.