Browsing by Author "Shiningayamwe, Kleopas P."

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    Investigating electronic pedestals of the analoque front-end boards of the upgraded high-energy stereoscopic system (H.E.S.S.I) cameras
    (University of Namibia, 2017) Shiningayamwe, Kleopas P.
    The High-Energy Stereoscopic System (H.E.S.S.) is an array of five imaging atmospheric Cherenkov telescopes located in the Khomas Highland in Namibia, dedicated to very-high-energy (VHE, 100 GeV { 100 TeV) gamma-ray astronomy. It consists of four identical 12 m diameter telescopes (H.E.S.S.-I) which started operating in 2003 and a large 28 m diameter telescope (H.E.S.S.-II) which was brought online in 2012 [1]. The H.E.S.S.-I camera upgrade project was aimed to increase the stability and performances of the camera operation by replacing the 13 years old camera electronics with modern-day technologies. The most delicate part of the upgraded electronics are the readout boards of the drawers, which have been upgraded with a new analog memory [2, 3]. A significant level of cross-talk has been observed in the analog front-end boards of the H.E.S.S.-I camera upgrade [3], and investigating the electronic pedestals of these analog boards could help understand the origin of such a cross-talk. A C++ code written in ROOT modular scientific software framework has been developed for the analysis of the data taken with a drawer on the Test bench at DESY in Zeuthen, Germany. So far, from the computation of the autocorrelation function and Fourier transform of the electronic pedestals, no characteristic patterns have been found to explain the level of cross-talk observed. The upgrade of the cameras is ongoing, and the investigations of the noise level of the rear part of the electronic boards will be continued.