  The coupling between a rapidly expanding cloud of ionized debris and an
ambient magnetized plasma is revisited with a hybrid (kinetic ion/fluid
electron) simulation code that allows a study over a wide range of plasma
parameters. Over a specified range of hypothetical conditions, simple scaling
laws in terms of the total debris mass and explosion speed are derived and
verified for the maximal size of the debris cloud and the fraction of debris
that free-streams from the burst along the magnetic field. The amount of debris
that escapes from the burst with minimal coupling to the background magnetic
field increases with the debris gyroradius. Test cases with two different
debris species--including a heavy minority species with a relatively large
gyroradius--highlight how the collisionless coupling of the debris depends on
the single-particle trajectories as well as the overall conservation of energy
and momentum.
