The high-speed after pulse measurement system for PMT

TL;DR

This paper introduces a high-speed measurement system using a desktop FADC to analyze 8-inch Hamamatsu PMTs, enabling detailed waveform analysis and characterization of after pulses, dark rate, and transit time spread.

Contribution

The system provides a fast, detailed, and digital approach for PMT characterization, including pulse shape, timing, and after pulse analysis, which improves upon traditional methods.

Findings

High precision after pulse time and charge distribution data

Ability to analyze dark rate and transit time spread

Enhanced waveform-based PMT characterization

Abstract

A system employing a desktop FADC has been developed to investigate the features of 8 inches Hamamatsu PMT. The system stands out for its high-speed and informative results as a consequence of adopting fast waveform sampling technology. Recording full waveforms allows us to perform digital signal processing, pulse shape analysis, and precision timing extraction. High precision after pulse time and charge distribution characteristics are presented in this manuscript. Other photomultipliers characteristics, such as dark rate and transit time spread, can also be obtained by exploiting waveform analysis using this system.