Studies of single-photoelectron response and of performance in magnetic field of a H8500C-03 photomultiplier tube

TL;DR

This study evaluates the H8500C-03 photomultiplier tube's single-photoelectron detection ability and its performance in magnetic fields, demonstrating its suitability for photon detection in high magnetic environments with proper shielding.

Contribution

It provides detailed analysis of the PMT's response in magnetic fields and identifies the primary cause of signal loss, offering insights for its use in magnetic environments.

Findings

Can resolve single photoelectron signals effectively.

Signal variation up to 55% in longitudinal magnetic fields.

Significant signal loss in transverse magnetic fields.

Abstract

We studied the single-photoelectron detection capabilities of a multianode photomultiplier tube H8500C-03 and its performance in high magnetic field. Our results show that the device can readily resolve signals at the single photoelectron level making it suitable for photon detection in both threshold and ring imaging Cerenkov detectors. We also found that a large longitudinal magnetic field, up to 300 Gauss, induces a change in the relative output of at most 55% for an edge pixel, and of at most 15% for a central pixel. The H8500C-03 signal loss in transverse magnetic fields it is significantly more pronounced than for the longitudinal case. Our studies of single photoelectron reduction in magnetic fields point to the field induced misfocusing of the photoelectron extracted from the photocathode as primary cause of signal loss. With appropriate shielding this PMT could function in high magnetic field environments.