Development and Quality Control of PMT Modules for the Large-Sized Telescopes of the Cherenkov Telescope Array Observatory

TL;DR

This paper details the development, technical specifications, and quality control processes of high-performance PMT modules used in the Large-Sized Telescopes of the Cherenkov Telescope Array, ensuring they meet stringent performance standards.

Contribution

It introduces a comprehensive design and quality control methodology for PMT modules, enabling mass production for CTA observatories with verified performance.

Findings

Modules meet photon detection efficiency requirements

Successful mass production and quality control completed

Modules demonstrate high performance in testing

Abstract

The camera of the Large-Sized Telescopes (LSTs) of the Cherenkov Telescope Array Observatory (CTAO) consists of 1855 pixels that are grouped into 265 high-performance photomultiplier tube (PMT) modules. Each module comprises a seven-light-guide plate, seven PMT units, a slow control board, and a readout board with a trigger board. %In this paper we describe The requirements for the PMT modules include various aspects, such as photon detection efficiency, dynamic range, buffer depth, and test pulse functionality. We have developed a high-performance PMT module that fulfills all these requirements. Mass-production and quality control (QC) of modules for all four LSTs of the northern CTAO have been completed. Here we report on the technical details of each element of the module and its performance, together with the methods and results of QC measurements.