Francisl wrote: Could a small onion type device be constructed now and placed close to the DPF to catch some x-rays to test the concept and do some preliminary engineering?
Well, it depends on what you want to test and what LPP could afford to spare in terms of time, effort and money.
But just showing that x-rays hitting carefully arranged layers of metal foil results in a certain amount electrical power would be nothing remarkable. The photoelectric effect is not all that mysterious… except, perhaps, when people confuse it with the relatively inefficient photovoltaic effect 🙂
If you would want to test an assembly more akin to what would go into an actual “onion” in a functional generator… then that will take time, effort and money that should instead be going to proving pB11 fusion.
First things first: proving the theory.
The “onion” will no doubt hold its own engineering surprises along the way but it’s not on the same level or the same scale as the reach for aneutronic fusion.
Now, if someone would want to build and donate a test panel of “onion” structure to LPP then perhaps something could be done that way?