this is simple.
what i actually want to ask is, when they do the subatomic particle collision experiments, how do they produce one single subatomic particle, e.g proton, neutron? how do they rip one single electron or photon off something? where do they store the single particle?
still, how do they keep the subatomic particle on track, on the designed trajectory?
even further, how do they make sure 2 such small particles to have a head-on collision? it's really a long shot, for they are incredibly small. how do they aim?