Hi Retric,<p>I do agree that the problem of controlling Q &#62; 1 plasma becomes easier as you increase the volume. However, I don't think that's the biggest problem. As you yourself point out, you're limited in how much heat the wall can take. This is fundamentally the limiting factor in fusion power plant designs, unless a much more efficient direct conversion scheme is feasible. Why not instead take the tungsten panels you'd use and point a bunch of mirrors at it, achieving the same heat flux? Mirrors are just not that expensive.<p>PS: Do you work in fusion, by the way?<p>PPS: We should chat more. Send me a message at dfong at lightsailenergy.com