“…The DIRC counter [2,3,4] verified that the Cherenkov image is well-transported by internal total reflection, and the CCT counter [6,7] exhibited that a time measurement for such Cherenkov photons is feasible. While the TOP detecter proposed here is based on a comprehensive compilation of the technical verification by those detecters, it can be used to exploit a new approach for measuring the TOP and Φ-angle correlation by making use of the horizontal focussing mirror.…”