title: Cherenkov Camera and Analysis Development for Highest-Energy Gamma-Ray Astronomy
creator: Zorn, Justus
subject: ddc-500
subject: 500 Natural sciences and mathematics
subject: ddc-520
subject: 520 Astronomy and allied sciences
subject: ddc-530
subject: 530 Physics
description: Imaging atmospheric Cherenkov telescopes are used for the detection of highest-energy γ-rays. This thesis focuses on two experiments equipped with such telescopes: The operating High Energy Stereoscopic System (H.E.S.S.) and the future Cherenkov Telescope Array (CTA). Four of the five H.E.S.S. cameras saw a major electronics upgrade a few years ago enabling improved readout and analysis techniques mainly at the highest energies. The Compact High-Energy Camera (CHEC) is a design for the Small-Sized Telescopes of CTA focusing on the detection of γ-rays with energies exceeding 1 TeV.  The first part of the thesis is dedicated to the characterisation of two CHEC prototype cameras developed successively: CHEC-M and CHEC-S. I present results of laboratory and on-telescope measurements for both cameras. In the case of CHEC-S, I focus on those parameters that had been shown to be performance-limiting in CHEC-M and which were therefore addressed in the design iteration for CHEC-S.  The second part is devoted to the upgraded H.E.S.S. cameras. I present results of Monte-Carlo simulation studies, analysis developments, and performance measurements using full-waveform readout. In the former case I demonstrate a general consistency between simulations and measurements, in the latter case I show that the use of full-sampled waveform readout improves the performance, especially at the highest energies.  In the last part, I present a new analysis of the Galactic γ-ray source HESS J1646–458 which is associated with Westerlund 1, the most massive stellar cluster in our Galaxy.
date: 2020
type: Dissertation
type: info:eu-repo/semantics/doctoralThesis
type: NonPeerReviewed
format: application/pdf
identifier: https://archiv.ub.uni-heidelberg.de/volltextserverhttps://archiv.ub.uni-heidelberg.de/volltextserver/27614/2/JZ-PhDThesis-university-submitted-version-d2019-11-05.pdf
identifier: DOI:10.11588/heidok.00027614
identifier: urn:nbn:de:bsz:16-heidok-276144
identifier:   Zorn, Justus  (2020) Cherenkov Camera and Analysis Development for Highest-Energy Gamma-Ray Astronomy.  [Dissertation]     
relation: https://archiv.ub.uni-heidelberg.de/volltextserver/27614/
rights: info:eu-repo/semantics/openAccess
rights: http://archiv.ub.uni-heidelberg.de/volltextserver/help/license_urhg.html
language: eng