#collider  an accelerator in which two beams of particles are forced to collide head on
  supertype:  #particle_accelerator__accelerator__atom_smasher  a scientific instrument that increases the kinetic energy of charged particles
  subtype:  #electron_accelerator  collider that consists of an accelerator that collides electrons and positrons
  subtype:  #proton_accelerator  a collider that collides beams of protons and antiprotons
  subtype:  #superconducting_supercollider__superconductingsupercollider  a collider that operates at very low temperatures

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