Analysis of data from the first CTA telescope

Stage numéro : M2-1920-CT-02
Laboratoire :Centre de Physique des Particules de Marseille Case 902
 163 avenue de Luminy - 13288 Marseille Cedex 9
Directeur :Cristinel Diaconu - 04.91.82.72.01 - diaconu@cppm.in2p3.fr
Correspondant :William Gillard - 04.91.82.72.67 - gillard@cppm.in2p3.fr
Groupe d'accueil :HESS-CTA
Chef de groupe :Heide Costantini 04.91.82.72.57 - costantini@cppm.in2p3.fr
Responsable de stage :Franca Cassol - 0491827248 - cassol@cppm.in2p3.fr

Thématique : Astroparticules

CTA (Cherenkov Telescope Array) is a worldwide project to construct the next generation ground based very high energy gamma ray instrument [1]-[2]. CTA will use more than hundred Imaging Air Cherenkov Telescopes of three different sizes (mirror diameter of 4 m, 12 m and 23 m) deployed on two sites, one on each hemisphere (La Palma on the Canary Islands and Paranal in Chile).

The CTA unconventional capabilities will address some of the most intriguing questions of astrophysics such as the origin of very high energy galactic cosmic rays. The observatory construction is foreseen in 2021-2025 but the first large size telescope (LST1) is already installed and in preproduction phase in La Palma. This telescope has a key role in the definition and validation of the methods and software tools for the future observatory.

The internship concerns the analysis of the LST1 data. The student will first verify the telescope calibration through the analysis of atmospheric muon images which are used as a powerful method to calibrate the optical throughput of each telescope. Then, she/he will test the event reconstruction chain, which is under development, on real data and on Monte Carlo (MC) simulated data in order to verify the status of the present tools. Finally, using MC data, she/he will test the effect of an incorrect camera calibration on the telescope energy resolution, energy threshold and effective area in order to estimate the corresponding systematic error on the reconstructed physical quantities.

A PhD contract can eventually follow the internship.

References:

[1] Science with the Cherenkov Telescope Array: https://arxiv.org/abs/1709.07997

[2] https://www.cta-observatory.org/