1. The sun is in equilibrium. Increased power would cause it to expand, and the power density is an exponential function of density. 2. You capture the neutron

1. The sun is in equilibrium. Increased power would cause it to expand, and the power density is an exponential function of density. 2. You capture the neutrons with a lithium container, which produces tritium. 3. The Z-machine is an inertial confinement machine: a powerful electric arc produces a radiation pulse that compresses the fision target. 4. I suspect if you can achieve ignition with tritium, you can use the fusion flash to ignite deuterium in a two stage process.