More Laser and Reactor work. Lasers work now, and Heat Generators generate energy from incident lasers, in order to test lasers. This is probably only temporary.
More work on Fusion Reactor
You are not using Wolfram|Alpha now, @unpairedbracket.
Reactor Multiblock work
Reactor Logic work. More complex now, and more realistic, taking some cues from BigReactors' example.

Plasma conducts temperature to the casing, which then conducts to coolant or the environment. Energy from passive cooling is stored in an internal buffer.