Also, unless I'm missing something obvious, this wouldn't really even remain cool fusion at higher outputs, no matter the scale you look at it from.
If the cores of these bubbles are hitting 15,000 degrees doesn't that mean as you put more energy into the liquid it's going to heat it to a rather high temperature? To get serious power out of this aren't you going to need some fairly impressive liquid unobtainium (liquid at room temp and still a liquid at several thousand degrees) or will breakeven probably occur (if it does at all) before we get to that point?
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Also, unless I'm missing something obvious, this wouldn't really even remain cool fusion at higher outputs, no matter the scale you look at it from. If the cores of these bubbles are hitting 15,000 degrees doesn't that mean as you put more energy into the liquid it's going to heat it to a rather high temperature? To get serious power out of this aren't you going to need some fairly impressive liquid unobtainium (liquid at room temp and still a liquid at several thousand degrees) or will breakeven probably occur (if it does at all) before we get to that point?