For a long time, I have been thinking about proton-Boron fusion reaction. Today the main focus is on deuterium-tritium reaction and both are gaseous. They need to be converted into plasma for fusion. But, Boron is solid and it can react with Proton i.e. simple hydrogen nuclei. Proton accelerators are already available. We just need a solid Boron bar and hit that with a Proton beam with sufficient energy. A few Protons from the beam will certainly hit the nucleus of the Boron and will fuse and generate power that can be easily converted into electricity. In case of a gaseous materials, the beam will cause ionisation and much more energy will be lost through ionisation. But, that's the not the case for solid. As per this paper at https://lib.dr.iastate.edu/cgi/viewcontent.cgi?referer=&httpsredir=1&article=1103&context=ameslab_iscreports, the number of elections released per Proton is just 3.39 and the energy loss is negligible.
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