re: Proton Nulling
I wonder if two proton beams will diffract each other if they are tuned properly? If so then a finite length proton beam mesh could front the black box. This mesh would be a whole series of captive protons, held in position in a grid-like pattern. The incoming proton beam would be aimed at empty grid spaces. Perhaps a diffraction would occur, the incoming protons creating a diffuse wave pattern inside the black box, with interference fringes of amplification and nulling.