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Reference : UMR7346-ANNPOR-055
Workplace : MARSEILLE 09
Date of publication : Monday, February 15, 2021
Scientific Responsible name : Aurélia Sécroun
Type of Contract : PhD Student contract / Thesis offer
Contract Period : 36 months
Start date of the thesis : 1 October 2021
Proportion of work : Full time
Remuneration : 2 135,00 € gross monthly
Description of the thesis topic
Preparation of the Euclid space mission: study of the correlations,
at the pixel level, of the infrared detectors' response
Euclid is an M-class ESA mission due to launch in 2022 (https://www.euclid-ec.org, https://sci.esa.int/web/euclid). It is one of the major observatories dedicated to cosmology and understanding the nature of Dark Energy through the mapping of all visible and infrared sky. The NISP (near-infrared spectrophotometer) instrument aboard Euclid holds the largest infrared focal plane array to fly and is filled with 16 infrared detectors specially designed and fabricated for Euclid by the American company Teledyne, and selected among 60 detectors by NASA as the highest performing detectors.
Those 'H2RG' detectors are constituted by a mosaic of 4 million hybrid HgCdTe pixels and make for a major contribution to the acquisition chain with a rather intricate behavior, as already observed during tests. Being able to precisely describe their behavior and extract parameters such as readout noise, conversion gain, or linearity, at the pixel level is an important challenge for reaching a sufficient processing quality and for meeting the 1% accuracy requirement on the final data.
The objective of the thesis is thus to derive a 'pixel' analysis of the detector response through a global approach of the various performance parameters (namely, noise, linearity, latency, etc.). This analysis will be based on the on-ground calibration of the flight detectors performed by CPPM (with some 1Po recorded on disk) in preparation of the Euclid mission with a view to providing reference maps at the pixel level for the correction and data processing of flight data. It should allow to bring out spatial variations and lead to individual pixel performance. A thorough study will require looking further into the finest effects that have been revealed during the tests, and propose original methods to describe the pixel response considering correlations between pixels, the acquisition history and the experimental conditions.
The PhD student will be a member of the Euclid Consortium.
The candidate should hold a Master of Sciences or Master of Engineering in instrumentation for space sciences or similar specialty. Good programming skills (python), good knowledge in signal processing and bases in instrumentation and semi-conductor physics are required. Strong motivation and ability to work in team are definitely appreciated.
CPPM (Centre de Physique des Particules de Marseille (CPPM) is a joint research unit under the supervision of both CNRS/IN2P3 and AMU (Aix-Marseille Université). Research conducted at CPPM is at the crossroad of infinitely small and infinitely large —from the study of the elementary components of matter to the exploration of the cosmos. We design and build state-of-the-art detector systems, operating under extreme conditions: under the sea, in space or underground. Most of our research is carried out within leading international scientific collaborations and our contributions are recognized worldwide. In particular, the Renoir team, dedicated to cosmology, is strongly involved in the large Euclid, LSST ans DESI surveys.
Constraints and risks
Possible international travel for missions
The candidate will complete his application with the two years of master M1 and M2.
- Two letters of recommendation (including one from the person in charge of the M2 master's degree)
before March 12, 2021 at: email@example.com
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