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

TL;DR

This study evaluates a Li-glass scintillation detector's ability to accurately detect and localize focused proton and deuteron beams, demonstrating an effective position resolution of about 5 mm using multi-anode photomultiplier technology.

Contribution

It introduces a method for optimizing single-hit efficiency and position resolution in a Li-glass scintillation detector for focused ion beams.

Findings

Approximately 80% of events registered in a single pixel at 50% threshold.

Achieved a position resolution of about 5 mm in X and Y directions.

Multi-pixel signals enable effective beam position detection.

Abstract

The response of a position-sensitive Li-glass based scintillation detector to focused beams of 2.5 MeV protons and deuterons has been investigated. The 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 by 8 pixel multi-anode photomultiplier tube. The signal amplitudes were recorded for each pixel on an event-by-event basis. Several pixels generally registered considerable signals at each beam location. The number of pixels above set thresholds were investigated, with the optimization of the single-hit efficiency 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 effective position resolution of ~5 mm in X and Y.