Someone must have done this experiment with deuterium oxide by now. I don’t know that any results would be of much use for energy production, because any serious heat would vaporize the medium. Ironically, it seems like a fusion powered space heater would be easier to make than a useful energy device even if some significant level of fusion could be produced. That is far from certain, of course. They always talk about the surface of the sun, but the surface is frigid compared to the core where fusion takes place.
-GregUsing a technique employed by astronomers to determine stellar surface temperatures, chemists at the University of Illinois at Urbana-Champaign have measured the temperature inside a single, acoustically driven collapsing bubble.
Temperature Inside Collapsing Bubble Four Times That Of Sun
Thank you agent Greg for this information.