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Search for inclined photon air showers with the AugerPrime Radio Detector / vorgelegt von Jannis Pawlowsky. Wuppertal, August 7, 2024
Inhalt
Structure and goals of this thesis
Cosmic Ray and Air Shower Physics
Cosmic Rays
Energy spectrum
Mass composition
Arrival direction
UHE photons
Production
Propagation
Air showers
Radio emission in air showers
Geomagnetic emission
Charge excess emission
Extensiveness of the radio emission
Frequency spectrum and coherence
The Pierre Auger Observatory
The baseline design
The Auger Engineering Radio Array
The AugerPrime Radio Detector
Radio Detector hardware
Radio reconstructions
Trigger and communication system at Auger
Photon searches at Auger
Variables for the discrimination of photons and hadrons
Previous photon searches
Motivation for an RD trigger for new photon searches
Radio noise at Auger
Overview of the data used
Description of observed features
Noise categorisation
Regular noise
Lightning as a noise source
Daily occuring noise
Source localisation
Noise localisation with AERA
Noise source localisation - polarisation method
55MHz source
27MHz source
35MHz source
Discussion of other possible noise sources
Development of a Radio trigger
Concept of the trigger mechanism
Threshold trigger design
Noise filter to reduce RFI noise
Inhibit of triggers during noise bursts
Trigger simulations in Off line
Testing of the trigger in field conditions
Test outline
Inhibit of RD T2 triggers
RD T2 rate
Expected T3 rate
Observed T3s
Fraction of inhibited time
Proceeding of the RD test and development
Proposed CDAS modifications
Detection of inclined photon air showers
Simulation set
Trigger efficiency for a radio trigger
Trigger efficiency for an SNR trigger
Trigger efficiency with implemented CDAS modification
Possible improvement of the trigger efficiency
Online zenith angle reconstruction
Stationary noise source rejection
Footprint shape rejection
Sub-threshold trigger combinations
Trigger efficiency increase for proton induced air showers
Radio reconstruction of inclined photon air showers
Iterative reconstruction chain
Arrival direction reconstruction
Energy reconstruction
Observed bias for the reconstruction of the EM energy of photons
Discussion of a parametrisation correction
Estimation of the photon energy
Comparison to the WCD energy estimation
Outlook on a discrimination analysis
Aperture and sky coverage of the inclined photon search
Summary and outlook
Appendix A: Offline implementation of the RD trigger
Appendix B: Proposed CDAS modification
Appendix C: Photon energy parametrisation