For anything to become a black hole, you would need a ****load of mass. 2 particles colliding with eachother generates energy, not mass. And even though E=MC2 explains how mass can be converted to energy, and vice versa. It also explains you would need an incredible amount of energy, and a way to convert it to mass. Something this device would probably be incapable of doing. To create a black hole, you would need more energy than our sun currently has. (Our sun will not collapse in a black hole) I'd be pretty amazed if this thing would be able to make a mini-black hole. Because then we could probably forget about cold fusion. We would not have any energy problems ever again. You would probably have invented some kind of Zero Point energy then.
Normally, this is true. However, energy is equivalent to mass. If you put enough energy in one spot, you can create black holes. It's (theoretically) possible to create black holes with enough intense laser-fire onto a single point.
Sidenote: Someone asked earlier, "Isn't a singularity only a few millimeters across?" and someone responded "black holes can be quite large."
A singularity is a single point at the center of a black hole, a point of infinite density. It has no measurable size; it's infinitely small and infinitely dense. The
event horizon, the point surrounding the singularity at which not even light can escape, has a definite size, depending on the mass of the black hole.