I wasn't really sure about some of the technical details myself including the X-rays. I think when you are talking about something with as much energy as an X-r

I wasn't really sure about some of the technical details myself including the X-rays. I think when you are talking about something with as much energy as an X-ray you would be looking at multiple effects with a cascade of electrons and photons being emitted and absorbed at different energy levels. But I think it would all be optimised for wrapping around the fusion core. I also think comparison of efficiency is tremendously hard because if you managed to create a fusion device with direct energy conversion you might have something that is essentially solid-state with no moving parts (apart from fuel injection). That implies being smaller, having faster control of the output power levels, and less maintenance. Hard to compare but a nice dream I think.