  The possibility of fusion ignition in proton-Boron$^{11}$ plasma is strongly
enhanced if the energy from the fusion-produced $\alpha$ particles is channeled
to fast protons, but in an environment in which most of the protons are
thermally distributed. This hybrid of thermonuclear fusion and beam-plasma
fusion offers surprisingly large advantages to either purely thermonuclear or
purely beam-plasma fusion, neither of which can by themselves significantly
exceed the large bremsstrahlung radiation emitted by the proton-Boron$^{11}$
plasma. The hybrid scheme has the potential to reduce the confinement time of
the reactants that is required to achieve ignition by an order of magnitude.
