  A deuterium-tritium (DT) nuclear pulse propulsion concept for fast
interplanetary transport is proposed utilizing almost all the energy for thrust
and without the need for a large radiator: 1. By letting the thermonuclear
micro-explosion take place in the center of a liquid hydrogen sphere with the
radius of the sphere large enough to slow down and absorb the neutrons of the
DT fusion reaction, heating the hydrogen to a fully ionized plasma at a
temperature of ~ 105 K. 2. By using the entire spacecraft as a magnetically
insulated gigavolt capacitor, igniting the DT micro-explosion with an intense
GeV ion beam discharging the gigavolt capacitor, possible if the space craft
has the topology of a torus.
