A 90° bend curved light-guide for TOF scintillating detectors

Abstract We report here a bench study of TOF resolution using a 90 ° bend curved solid light-guide (LG) used to transport the light from a plastic scintillator counter to a photomultiplier (PMT). The 90 ° 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 × 100 × 60 mm3 and light read-out by PMTs at its two 100 × 60 mm 2 sides, when 90 ° LG benders are used between the scintillating bar and the PMTs on both sides, the TOF resolution is worsen, by 5–10%.