YAY! I have a functional and stable fusion reactor! Pictures first:
About the melting neutron absorbers, I added a second row of steam boilers behind the 24 critical ones, and when that wasn't enough, I put cooling fins on top. Also, you see no escaping plasma. That was apparently caused by the lag, which I also almost completely removed, albeit at a cost. It was caused by the ElectriCraft batteries. Here's a comparison chart:
The problem is caused by active batteries which are also connected to an input wire, regardless of whether any energy comes in on that input wire. I still have two of those in my system, maybe I'll try to remove them as well, but there appear to be aggravating conditions:
(1) The battery is outputting non-constant power.
(2) The battery is outputting constant power at an amperage which is not a power of 2.
Opis reported a timing of about 300000µs for the first setup, and still an excessive 20000µs for the second. Without the problems caused by the batteries, I would have no tick lag at all.
What this means for my reactor is that possibly I can't ever have a constantly running system since I need to shut off the reactor before I refill the battery powering the reactor systems. The only way I see around that is not to use ElectriCraft to power my reactor systems. Anyway, I'll leave that for later. Now I think I've earned some rest before I go into making the status displays, making my reactor self-sustaining and prettying things up a bit. I need to learn PneumaticCraft anyway. One thing I should mention: the reactor uses up deuterium and tritium at about 200 mB per second, which is rather close to the 100B/10min reported elsewhere. However, the three HP turbines drink lubricant at the insane rate of approximately 2 buckets per second. I will need more lilypads of fertility in my canola farm, and I need to dedicate an extra grinder to making lubricant.