Missions

The post-doctoral researcher will be part of the ASSD (Astroparticle Solid State Detectors) team and will be in charge of the development and operation of research related to the detectors of the EDELWEISS-subGeV experiment within IJCLab. He will work under the supervision of Stefanos Marnieros within the framework of the ANR-CRYOSEL project aimed at the development of innovative Germanium cryogenic detectors. The objective of the CRYOSEL project is the development of a new type of charge sensor, capable of reaching the ultimate threshold of single electron-hole pair in Ge (about 1 eV) while rejecting almost all of the background noise observed at low energy. The post-doctoral researcher will carry out experimental work on the calibration of many prototype detectors as well as extended modeling in order to develop and achieve an optimal design solution.

Activités

The post-doctoral fellow will be in charge of the following activities:
• study and data analysis of innovative Ge cryogenic detectors
• responsible of the detector integration in a dedicated test band (dilution refrigerator) and low noise data acquisition
• Interaction at regular intervals with the members of the EDELWEISS experiment to present the results obtained
• Modeling of detectors with finite element software such as COSMOL or equivalent
• Participation in the design and manufacture of bolometric detectors in Ge
• Bibliographic research and publication of one or more articles related to the data analysis realised during the project. Participation in conferences and workshops.
It is expected that this work will ultimately lead to the realization of several Ge detectors that will operate at the Underground Laboratory of Modane for exploration of light dark matter well beyond the limits of the current exclusion curves.

Compétences

• experimental thesis in cryogenic detectors
• solid knowledge in bolometric detectors, ideally with experience in Ge and Si semiconductors and superconducting sensors
• experience in integrating detectors in a cryogenic test band and operation of a dilution refrigeration cryostat
• experience in data analysis using optimal filtering
• experience in detector modeling and manufacturing
• experience on rare event and low radioactivity detection
• fluent English, both written and spoken
• ability to work in a team on multidisciplinary projects

Contexte de travail

The Irène Joliot-Curie Physics Laboratory of 2 Infinities (IJCLab) is a UMR under the supervision of the CNRS (IN2P3), the University of Paris-Saclay and the University of Paris is located on the campus of the University of Paris -Saclay in Orsay. The laboratory is located on the campus of the Université Paris-Sud, Université Paris-Saclay in Orsay. The campus is located 20 km south of Paris and easily accessible by RER in 35 minutes.
IJCLab was born in 2020 from the merger of five units (CSNSM, IMNC, IPN, LAL, LPT). The staff is made up of nearly 560 permanent (340 engineers, technicians and administrators and 220 researchers and teacher-researchers) and approximately 200 non-permanent including 120 doctoral students. The research themes of the laboratory are nuclear physics, high energy physics, theoretical physics, astroparticles, astrophysics and cosmology, particle accelerators, energy and the environment and health. IJCLab has very significant technical capacities (around 280 IT) in all the major fields required to design, develop / implement the experimental devices necessary for its scientific activity, as well as the design, development and use of instruments.
The researcher will work in the ASSD group of IJCLab which is involved in several experimental Astroparticle projects using cryogenic detectors. The group includes around 15 physicists (permanent researchers, post-docs and doctoral students). The ASSD team has a clean room with several high-vacuum evaporators allowing thin-film deposition for the development of prototype detectors. Several cryogenic test benches are available for the calibration and characterization of these detectors, as well as dedicated rooms for their integration into the experimental setup.

Contraintes et risques

Short periods of travel within France and abroad should be expected

Informations complémentaires

Experience in the field of bolometric detectors and very low temperature superconducting sensors. Experience in sub-Kelvin cryogenics, calibration of detectors using low-noise electronics, data acquisition and analysis.

As IJCLab is subjected to ZRR (Zone à Régime Restrictif) military regulation, hiring choices must be approved by the Haut Fonctionnaire Securité Défense (HFSD). Therefore, the date of employment written above should be understood as provisional, and may need to be delayed.


Submit a covering letter and CV showing diplomas, titles and work and professional experience. In addition to CVs and LMs, it is possible to attach letters of recommendation.