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Portail > Offres > Offre UMR9012-SYLPRA0-043 - (H/F) Post-doctoral sur CTA : la calibration NectarCAM, l'analyse des données et la préparation scientifique

(M/F) :Post-doctoral position on CTA NectarCAM calibration, data analysis, and science preparation.

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

Date Limite Candidature : lundi 22 août 2022

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General information

Reference : UMR9012-SYLPRA0-043
Workplace : ORSAY
Date of publication : Monday, July 4, 2022
Type of Contract : FTC Scientist
Contract Period : 24 months
Expected date of employment : 1 November 2022
Proportion of work : Full time
Remuneration : Between €2664 and €3069 gross per month, depending on professional experience
Desired level of education : PhD
Experience required : 1 to 4 years


The post-doctoral fellow will contribute to the commissioning of NectarCAM and its calibration system. She/he will also participate to analyze the first NectarCAM data. In parallel, she/he will participate in the preparation of CTA science.

CTA Context
IJCLab (Irene Joliot Curie laboratoire de Physique des 2 Infinis https://www.ijclab.in2p3.fr/ ), a laboratory that is part of the IN2P3/CNRS institute and of the Paris-Saclay University, is launching a call for applications for a post-doctoral position to work in the field of high-energy gamma-ray observations with the Cherenkov Telescope Array (CTA). The post-doctoral fellow will in particular contribute to the NectarCAM camera calibration system commissioning, to the analysis of the first data from the Medium Sized Telescope (MST) and to the CTA science preparation.
The Cherenkov Telescope Array (CTA) is the next-generation worldwide gamma-ray astronomy facility. The CTA Observatory is composed of the large- (23m diameter, LST), medium- (12m diameter, MST), and small-sized (4m diameter, SST) telescopes that will be located in La Palma, Canary Islands, and on the European Southern Observatory (ESO) site in Paranal, Chile. With its unprecedented sensitivity, its arcminute angular resolution, an excellent energy resolution, and a wide energy coverage from 30 GeV to 300 TeV, CTA promises a major leap forward in our understanding of cosmic accelerators. The CTA science case addresses several of the key questions of Astroparticle Physics (https://arxiv.org/pdf/1709.07997.pdf ).
The IJCLab CTA team contributes to the NectarCAM project. NectarCAM is a camera, composed of photomultiplier tubes (PMTs), that will equip the MST telescopes in the Northern site of CTA. The group is responsible for the design and production of the single photo-electron (SPE) calibration system and reflective target of NectarCAM. The calibration system has been designed for a dual purpose: one side will enable the measurement of the gain of the whole photo-detection chain in SPE regime, while the rear face will be used for mirror alignment and the study of the optical point spread function. More information on the calibration system can be found in Refs. B. Biasuzzi et al. arXiv:1910.07446 and P. Sharma et al. ICRC 2021, arXiv:2110.14956v1 [astro-ph.IM].

The IJCLab group is in parallel actively involved in the science preparation, both for extra-galactic and galactic science topics. Applications with a project on CTA capabilities to observe Galactic sources are encouraged, with particular attention to Galactic cosmic-ray sources. Observations of high-energy gamma rays can indirectly indicate acceleration of charged cosmic rays up to PeV energies (sources called PeVatrons) fostering fruitful insights to the search of the origin of cosmic rays.
The proposed position is very timely since the first NectarCAM camera together with the MST telescope will be installed to La Palma in 2023. The post-doctoral fellow will contribute to the commissioning of NectarCAM and its calibration system. She/he will also participate to analyze the first NectarCAM data. In parallel, she/he will participate to the preparation of CTA science.


The post-doctoral fellow will integrate the CTA team at IJCLab and will supervised by Tiina Suomijarvi and Giulia Hull. Tiina Suomijarvi is Full Professor at Paris-Saclay University, head of the CTA group at IJCLab and expert in cosmic-ray Physics. Giulia Hull is a Research Engineer, head of the Particle Detector Group at IJCLab, expert in the field of photodetection. The post-doctoral fellow will be in the APHE (Astroparticules de Haute Energie) team of the A2C pole of IJCLab. In addition to CTA, the APHE team also works for the Pierre Auger Observatory. The APHE team is currently composed of 5 permanent researchers, one post-doctoral fellow (Auger) and 3 PhD students. In addition to CTA, the team is working on the Auger data analysis, on AugerPrime commissioning and on multi-messenger data analysis.

The post-doctoral fellow will have the following CTA activities.
• The post-doctoral fellow will be in charge the calibration system characterization and the tests that are performed on the system at CEA/Irfu.
• The post-doctoral fellow will contribute to the commissioning of the calibration system and the NectarCAM camera. In particular, she/he will be in charge of the commissioning concerning the calibration system.
• She/he will participate to the analysis of the first NectarCAM data and ensure that the calibration is within the expected performances.
• The post-doctoral fellow will also participate to the early science with NectarCAM and to the preparation of the CTA science with particular emphasis on Galactic science and cosmic-ray origin.


The candidates are required to have the following skills:
• Recent PhD thesis in Physics (astroparticles, particle physics, astrophysics)
• Good knowledge in software development
• Fluency in English, spoken and written.

Work Context

IJCLab https://www.ijclab.in2p3.fr/ is the largest high-energy physics laboratory of the French CNRS/IN2P3 and part of the Paris-Saclay University. It provides a top-level scientific environment, support, diversity and activities beyond specific CTA tasks. The laboratory is involved in CTA since 2015. The team at IJCLab collaborates with the other laboratories involved in the CTA project. There is a tight synergy between the laboratories involved in the development of NectarCAM, in particular with CTA groups at LLR, CEA/Irfu, APC and LPNHE. Furthermore, the post-doctoral fellow will participate to various CTA working groups.

Constraints and risks

Travel: short-term travel is to be expected, mainly to the CTA Northern site in La Palma and to European countries.

Additional Information

This position is funded for a period of two years. Candidates must hold a PhD, obtained less than 2 years prior to the start of the post. Applications and selection will take place from July 2022 until the post is filled.
Candidates should apply via the CNRS Job Portal https://emploi.cnrs.fr/Offres.aspx :
- Submit a cover letter explaining their interest in the position and a detailed curriculum vitae (containing a description of their research experience with a list of publications highlighting their personal contributions);
- Have references to send at least 2 letters of recommendation.
For further information, candidates may contact
Tiina Suomijärvi (tiina.suomijarvi@ijclab.in2p3.fr ) or
Giulia Hull (giulia.hull@ijclab.in2p3.fr ).

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