Design considerations for colliders using co-moving beams for fusion cross section research

Collisions between beams moving in the same direction but with different velocities allow for low center mass energy collisions with higher energy beams. These types of systems lend themselves to fusion interactions since they require low center of mass kinetic energies, but can benefit from higher energies in the constituent beams. Here we cover the design considerations for a machine that could study these types of interactions. We especially highlight reactants that can be stored and collided in a single ring, using a collision timing system known as gear -changing, which could allow for a proof of concept experiment in an existing machine.