Don't you need.. a reactor ?
The thing is a "reactor". It is a large vacuum tube.
One electrode is made of boron, say 1kG of it, connected to negative.
Other electrode is made say of palladium, connected to positive, and connected to hydrogen under pressure , and heated - so it is a source of protons H+.
The voltage applied is 0.6 MegaVolt.
So the protons are accelerated toward the boron, and reach it at energy 0.6MeV, which is optimal for the intended reaction between Boron and proton, which produces three alpfa particles He4+, with total energy 7.4 MeV
No heat is generated, alpha particles reach the enveloping output electrode, producing charge of +6e on it, by capturing six electrons from the output electrode .
It is not shown, but resulting helium must be removed, for continious process to occur.
1kG of boron, will produce total of 17.7 GWh of energy.
In other words, for 17 hours it can substitute for a standard gigawatt nuclear power reactor.
In other words, with 516 kg of boron, it can substitute for a standard gigawatt nuclear power plant reactor for a year.
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