tlb wrote:Hephaestus was not a good target for a smuggled bomb (or several), precisely because of its enormous size: there was no way to get close to destroying either the shipyards or the missile production lines. Yes, it would create a major disturbance, but it would not alter the dynamics of the war.
A good fusion bomb design will yield about 6kt per kilo. Or 6MT per ton. So a multi-hundred ton cargo container will go boom with 1-2 gigatons.
So you get the prompt xray emissions, which turns everything around it into super heated plasma, producing a shock front that vaporizes everything it touches as it accelerates them to many km/sec. When it stops being able to do this you have a debris cloud moving at hypersonic speed in an expanding sphere. It's very unclear when this will be the case, but in the atmosphere the fireball would be 7-9km in diameter.
So basically everything within say 32 km is directly destroyed by the thermal pulse, the xray radiation, the melted remnants of a bulkhead moving at mach 6 or being smashed by a 500 ton shuttle moving at mach 2.
Equal and opposite reaction means the entire remaining platform is going to move away from the bomb. The entire structure of the platform will also transmit this shock, which will be, once it stops having enough energy to remain supersonic, at about 6km sec. So the entire remainig structure will essentially get a very high energy earthquake as I'll bet the structural materiel is not going to absorb very much.
The part past say 35-40km out probably won't be directly destroyed or crushed flat, just badly twisted and bent. Which is unfortunate as that lets the air leak out as the now slowly spinning fragments move away from the huge hole in the middle of the structure.
This assumes that secondary explosions of running fusion reactors, which David has shown are exa-scale explosions and would produce a fireball larger then the entire platform, don't occur.
So, no, it would actually be sufficiently destructive for most people's purposes.