The Particle Accelerator is a work in progress as of 1.7. It will be built in a hollow 3x3 configuration with Electromagnet Supercoolers on the corners and Superconducting Electromagnets on the sides. It is then continued to make a hollow tube in a square shape. It will run on electrons, Liquid Helium, and RF. The Electromagnet Supercoolers require about 0.05 mB/t of Liquid Helium and the Superconducting Electromagnets 500 RF/t.
In the next update it will produce antimatter temporarily, and will produce more stuff in updates beyond that. TLJGames has specified that at a size of 100x100 blocks, all particles should be attainable throughout the collider.