The upgraded Data Acquisition System of the H.E.S.S. telescope array

TL;DR

This paper describes the recent upgrades to the H.E.S.S. telescope array's Data Acquisition System, enhancing its hardware and software to improve gamma-ray observation capabilities and operational efficiency.

Contribution

It introduces the upgraded DAQ system, including new hardware and software components, and discusses its improved performance and operational lessons learned.

Findings

Enhanced data-taking capabilities of H.E.S.S.

Successful integration of a new camera on the 28m telescope

Improved system reliability and operational efficiency

Abstract

The High Energy Stereoscopic System (H.E.S.S.) is an array of five Imaging Atmospheric Cherenkov Telescopes located in the Khomas Highland of Namibia. H.E.S.S. observes gamma rays above tens of GeV by detecting the Cherenkov light that is produced when Very High Energy gamma rays interact with the Earth's atmosphere. The H.E.S.S. Data Acquisition System (DAQ) coordinates the nightly telescope operations, ensuring that the various components communicate properly and behave as intended. It also provides the interface between the telescopes and the people on shift who guide the operations. The DAQ comprises both the hardware and software, and since the beginning of H.E.S.S., both elements have been continuously adapted to improve the data-taking capabilities of the array and push the limits of what H.E.S.S. is capable of. Most recently, this includes the upgrade of the entire computing cluster hosting the DAQ software, and the accommodation of a new camera on the large 28m H.E.S.S. telescope. We discuss the performance of the upgraded DAQ and the lessons learned from these activities.