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PhD student analysis of the first LST/CTA gamma ray telescope data

This offer is available in the following languages:
Français - Anglais

Date Limite Candidature : mardi 31 mai 2022

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General information

Reference : UMR5814-CORFEU-001
Date of publication : Tuesday, May 10, 2022
Scientific Responsible name : CAROFF SAMI
Type of Contract : PhD Student contract / Thesis offer
Contract Period : 36 months
Start date of the thesis : 1 October 2022
Proportion of work : Full time
Remuneration : 2 135,00 € gross monthly

Description of the thesis topic

The CNRS LAPP (Laboratoire d'Annecy de Physique des Particules) Institute is opening a PhD position. The thesis will focus on the analysis of the first data from the Large Size Telescope (LST) part of the Cherenkov Telescope Array (CTA) observatory. The CTA observatory will consist of a network of around a hundred telescopes distributed between the northern hemisphere and the southern hemisphere, with the purpose of measuring gamma rays from 20 GeV to 300 TeV. The analysis of these data will take place in the context of the construction of the CTA site in the Northern hemisphere, in the island of La Palma (Canary Islands).
The aim of the thesis will be the analysis of the first LST data on transient sources, in particular gamma-ray bursts and AGN flare. Mastering and improving data analysis tools dedicated to this type of source will be one of the goals of the successful candidate.

Position and Main Responsibilities
The successful candidate will mainly work on the analysis of the first data from the LST as well as the telescopes which will be built in the coming years (3 additional LSTs and construction of the MSTs - Medium Size Telescopes - during the year 2022). The work of the candidate will be the development of analysis chains in a context of construction and extension of the network.

The candidate will be required to work on the analysis of transient sources, in particular gamma-ray bursts and eruptions of active galactic nuclei, which will be monitored by telescopes. Direct involvement in helping to detect these sources will be provided by work on real-time analysis.

This type of transient source allows in particular a study of the Lorentz invariance, allowing fine tests of the invariance of the speed of light at energies close to the Planck mass. This fundamental physics subject will be perform by the analysis of the data collected by LST and the CTA North network. This will be the main scientific mission of the candidate.

A contribution to the taking of data from telescopes in the northern hemisphere will be requested, through regular visits to the CTA site on the island of La Palma. The candidate will work at LAPP, a laboratory involved for many years in gamma astronomy. The LAPP has long participated in the H.E.S.S. collaboration, a network of telescopes that is the precursor of the CTA network.

The LAPP is also a major contributor to the CTA experiment, in particular with driving work on the LST-1 prototype which will be part of the CTA network on the North site.

Required qualifications
- Master 2 in astroparticles, astrophysics, particle physics, high energy physics
- Ability to collaborate in a team, in an international environment within a multidisciplinary team
- A good level in Python programming is appreciated

Work Context

The LAPP is a laboratory of the Institute of Nuclear Physics and Particle Physics (IN2P3), institute of the National Center for Scientific Research (CNRS) which coordinates programs in these fields. The LAPP is a joint research unit (UMR 5814) of the CNRS and the Université Savoie Mont-Blanc (USMB). More than 150 researchers, research teachers, engineers, technicians, administrators, students and foreign visitors work there. The research conducted at the LAPP aims to study the physics of elementary particles and their fundamental interactions, as well as to explore their links with the major structures of the Universe. The LAPP is involved in the experiments of the LHC (ATLAS, LHCb), neutrinos (SuperNémo, STEREO, LBNO, etc.), astrophysics (HESS, CTA) or gravitational waves (Virgo). The location of the laboratory 50 kms from CERN, and the presence of a theoretical physics laboratory in the same premises, make it a very attractive laboratory for all scientists in this field of research. The LAPP also houses an intermediate-sized mesocenter for computation and storage, but which contributes significantly to the data processing of large physics experiments such as ATLAS, LHCb or CTA.

The CTA observatory will consist of a network of about 100 telescopes distributed between the Northern and Southern hemispheres, the aim of which is the measurement of gamma rays from 20 GeV to 300 TeV. This thesis will take place in a context of construction of the CTA site in the Northern Hemisphere, on the island of La Palma (Canary Islands), and in the Southern Hemisphere, in Paranal, Chile.

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