Not quite. It is designed to recreate the energies present 90 nanoseconds after the big bang. This energy is still low compared to the energy at t=0. For instance, an Active Galactic Nucleus is far more powerful than any particle accelerator now, and in the forseeable future (possibly more than man can do, but I cannot know for sure). Hence the 'In a box'. I don't look too far into it. Not a fan of the Big Bang theory. That's just me however.