Response of a Li-glass/multi-anode photomultiplier detector to focused proton and deuteron beams

Abstract

e response of a position-sensitive Li-glass based scintillation detector to focused beams of 2.5 MeV protons and deuterons has been investigated. e beams were scanned across the detector in 0.5 mm horizontal and vertical steps perpendicular to the beams. Scintillation light was registered using an 8 × 8 pixel multi-anode photomultiplier tube. e signal amplitudes were recorded for each pixel on an eventby-event basis. Several pixels generally registered considerable signals at each beam location. e number of pixels above set thresholds were investigated, with the optimization of the single-hit e ciency over the largest possible area as the goal. For both beams, at a threshold of ∼50% of the mean of the full-deposition peak, ∼80% of the events were registered in a single pixel, resulting in an e ective position resolution of ∼5 mm in X and Y.