  A semi-analytic model for plasma-jet-driven magneto-inertial fusion is
presented. Compressions of a magnetized plasma target by a spherically
imploding plasma liner are calculated in one dimension (1D), accounting for
compressible hydrodynamics and ionization of the liner material, energy losses
due to conduction and radiation, fusion burn and alpha deposition, separate ion
and electron temperatures in the target, magnetic pressure, and fuel burn-up.
Results show 1D gains of 3-30 at spherical convergence ratio < 15 and 20-40 MJ
of liner energy, for cases in which the liner thickness is 1 cm and the initial
radius of a preheated magnetized target is 4 cm. Some exploration of parameter
space and physics settings is presented. The yields observed suggest that there
is a possibility of igniting additional dense fuel layers to reach high gain.
