Abstract
The Cherenkov Telescope Array (CTA) will be the next major observatory for Very High Energy gamma-ray astronomy. Its optical throughput calibration relies on muon Cherenkov rings. This work is aimed at developing a fast and efficient muon tagger at the camera level for the CTA telescopes. A novel technique to tag muons using the capabilities of silicon photomultiplier Compact High-Energy Camera CHEC-S, one of the design options for the camera of the small size telescopes, has been developed, studying and comparing different algorithms such as circle fitting with the Taubin method, machine learning using a neural network and simple pixel counting. Their performance in terms of efficiency and computation speed was investigated using simulations with varying levels of night sky background light. The application of the best performing method to the large size telescope camera has also been studied, to improve the speed of the muon preselection.
Highlights
The Cherenkov Telescope Array (CTA) will be the most important observatory for Very High Energy (VHE) γ-ray astronomy for the decade and beyond, covering an energy range from 20 GeV up to 300 TeV
Muons produced in Extensive Air Showers (EASs) are an important absolute calibration source of Imaging Atmospheric Cherenkov Telescopes (IACTs) and this is a well-established technique for telescope optical efficiency calibration [1]
Since the muon Cherenkov images are local to individual telescopes, but the readout is array-triggered, in case of the Small-Sized Telescopes (SSTs), a muon trigger is necessary
Summary
The Cherenkov Telescope Array (CTA) will be the most important observatory for Very High Energy (VHE) γ-ray astronomy for the decade and beyond, covering an energy range from 20 GeV up to 300 TeV. Improved performances with respect to the current Imaging Atmospheric Cherenkov Telescopes (IACTs) generation in terms of field of view, sensitivity and angular resolution are forseen. There will be 100 telescopes with different dimensions: the Large-Sized Telescopes (LSTs), the Medium-Sized Telescopes (MSTs) and the Small-Sized Telescopes (SSTs) covering the low, medium and high energy ranges of CTA respectively. (∗) Full consortium list available at www.cta-observatory.org.
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