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Reflector simulation program for an imaging air Cherenkov telescope
2008 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

In the last 20 years the ground-based telescopes have opened a new observation window at very high energies (VHE) between 100 GeV and 10 TeV, with the application of imaging air Cherenkov technique. Here the Cherenkov light from secondary particles produced in electromagnetic cascades, initiated from a primary gamma-photon or a charged particle, is measured. As the Cherenkov light flashes are very faint and short, a large reflector as well as a high sensitivity photo-multiplier camera is used. From the images of the air shower, the identity and energy of the primary particle could be reconstructed. The base for this reconstruction is the comparison with artificial air showers produced by Monte Carlo simulations and processed through a complete detector simulation. The current generation of large Imaging Air Cherenkov telescopes, as MAGIC or H.E.S.S is not practical for long time monitoring of certain sources, mainly for cost reasons. Therefore a new instrument is proposed, which is dedicated to long time observations of bright nearby blazars. It is based on a technical upgrade of one of the former Cherenkov telescopes of the HERGA experiment. The observation targets are extragalactic objects, that show non-thermal broad band emission from the radio band up to VHE gamma-rays. Among the most extreme astrophysical objects, blazers emit most of their energy at gamma-rays and show time variability in scales from years down to several minutes. So far, long term monitoring lack from the small sampling of the light curve at VHE. For the ongoing studies of the instrument and coming data analysis, a new detector simulation is necessary. In this work, the reflection of Cherenkov photons, produced with the air shower simulation program CORSIKA[Heck et al.(1998)], at a user-defined reflector with user-defined properties is simulated and introduced in the existing framework MARS. The detector simulations presented in the end show comparable results to the MAGIC reflector.

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Keyword [sv]
URN: urn:nbn:se:ltu:diva-49850ISRN: LTU-PB-EX--08/079--SELocal ID: 729fc1ea-3059-463d-a416-2994bf72f14cOAI: diva2:1023198
Subject / course
Student thesis, at least 30 credits
Educational program
Space Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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