A 90° Bend Curved Light-Guide for TOF Scintillating Detectors

We report here a bench study of TOF resolution using a 90 degrees bend curved solid light-guide (LG) used to transport the light from a plastic scintillator counter to a photomultiplier (PMT). The 90 degrees LG allows the rotation of the PMT axis to be vertical to the detector axis, in an environment featured by a strong magnetic field along the detector surface, or other geometrical constrains. We show that with a TOF counter of 2000 x 100 x 60 mm(3) and light read-out by PMTs at its two 100 x 60 mm(2) sides, when 90 degrees LG benders are used between the scintillating bar and the PMTs on both sides, the TOF resolution is worsen, by 5-10%.