Kavli Affiliate: Eric Oberla | First 5 Authors: E. Oberla, H. J. Frisch, , , | Summary: A first experimental test of tracking relativistic charged particles by `drifting’ Cherenkov photons in a water-based optical time-projection chamber (OTPC) has been performed at the Fermilab Test Beam Facility. The prototype OTPC detector consists of a 77~cm long, […]