Fusion Ship II, is a 750 MW thrust manned space vehicle in the 500 metric ton class, using Inertial Electrostatic Fusion (IEC), with outer
planet trip times of several months.
A proton energy gain (power in 14.7-MeV protons/input electric power)
of > 9 is required for acceptable radiator mass and size.
The propulsion system is based on NSTAR-extrapolated Argon ion thrusters operating at 35,000 seconds and a total thrust of 4,370 N. Round trip travel time for a typical Jupiter mission ΔV of 202,000 m/s is then 363 days.
Inertial Electrostatic Fusion has gotten $8 million in funding for the Bussard reactors at EMC2 fusion
Robert Bussard had proposed more advanced fusion propulsion if IEC fusion worked the way he envisioned
Last year Nextbigfuture interviewed Dr Richard Nebel who is running the IEC fusion reactor project and he indicated that we will know the viability for commercial fusion (and space propolsion is easier than commercial fusion) within two years