Studies of relative gain and timing response of fine-mesh photomultiplier tubes in high magnetic fields

TL;DR

This study evaluates the performance of specific fine-mesh photomultiplier tubes in high magnetic fields, demonstrating that one model maintains reliable gain and timing resolution above 1.5 T, while another's timing degrades significantly.

Contribution

It provides detailed measurements of gain and timing response of two Hamamatsu fine-mesh PMTs in magnetic fields up to 1.9 T, highlighting their operational limits and performance characteristics.

Findings

H6614-70 operates reliably above 1.5 T with acceptable timing resolution.

H6152-70's gain reduces similarly but its timing worsens at high fields.

H6614-70 maintains performance with a gain reduction of about 100.

Abstract

We investigated the use of Hamamatsu fine-mesh photomultiplier tube assemblies H6152-70 and H6614-70 with regards to their gain and timing resolution in magnetic fields up to 1.9 T. Our results show that the H6614-70 assembly can operate reliably in magnetic fields exceeding 1.5 T, while preserving a reasonable timing resolution even with a gain reduction of a factor of approximately 100. The reduction of the relative gain of the H6152-70 is similar to the H6614-70's near 1.5 T, but its timing resolution worsens considerably at this high field.