Jobs


Electronique
Design and Test Electronic Engineer
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Internship supervisor:
Patrick Pangaud - +33 4 91 82 76 44 - pangaud@cppm.in2p3.fr
Sorry, this position is no longer available
Description:

WHO ARE WE?

Located in the heart of the Parc National des Calanques, on the Luminy campus, the CPPM is a joint research laboratory of the CNRS and the University of Aix-Marseille, with around 180 researchers, engineers and PhD students. The laboratory studies topics ranging from particle physics to astroparticle physics and cosmology, with a strong technological focus on electronics, mechanics, instrumentation and computing, enabling the design and construction of cutting-edge detection systems that often have to operate in extreme conditions: in the depths of the sea, in space or underground. Much of our research is carried out as part of leading international scientific collaborations, and our contributions are recognised worldwide. The MPCC is committed to ethical research and to promoting diversity and inclusion in the workplace, and provides administrative and logistical support to newcomers. (More details here: https://www.cppm.in2p3.fr/web/en/index.html)


WHO ARE YOU?

You have a degree in engineering or a Master's degree in electronics and have acquired skills in electronics through a significant internship or initial experience.


You are interested in projects with a strong technical component and in the variety of activities offered by this position (electronics, instrumentation, firmware). You like to create and innovate, and are attracted by working in the world of Research, at the CNRS and in international collaborations.


You are interested in FPGA-based electronic design, instrumentation, test and development of VHDL firmware and embedded software.


You are interested in the following areas

• Designing and testing complex electronic systems based on controllers and/or FPGAs

• Instrumentation and interconnection standards (standards and protocols)

• Developing software tools in C / Python for controllers

You may have knowledge or skills in

• High speed transmission techniques over copper and/or optical fibres

• Development and simulation of VHDL projects on FPGA targets

• Knowledge of the version control tool GIT

• Electromagnetic compatibility principles and rules

Autonomy, rigour, methodology, organisation, analytical skills and a taste for teamwork are essential for this position.

A good command of English (B2 level) is required for working in international teams and for reading and writing technical documents.


WHAT WE CAN ACHIEVE TOGETHER

The CPPM has 190 employees. You will be working in the electronics department, which is made up of about 20 people and has extensive know-how in the design of complex acquisition boards for particle physics experiments.


You will participate in the development of a dozen prototype boards in ATCA format, equipped with the latest generation of Intel FPGAs (Stratix 10, Agilex 7) and 160 optical links with a throughput of up to 25Gb/s. These boards will be used to upgrade the detector of the ATLAS experiment at CERN in Geneva. In a first phase, performance evaluation tests will be carried out and embedded software will be developed. This software will be revised for integration into the production test bench. A second phase will aim at the qualification of the system and the implementation of a production of 300 cards.


These activities will be carried out in close collaboration with the project leader and the development team working in an international framework linked to the ATLAS collaboration. Travel to CERN is foreseen for technical missions, but also to present the activities and progress of the project. Supervision of students could be envisaged.


You will need to


- Understand the specifications and electronic architecture of the board,


- Develop test strategies and apply performance validation methods


- Design the associated measurement, data acquisition and processing systems,


- Develop VHDL projects and embedded firmware on the controller,


- Perform pre-series testing,


- Participate in the realisation of the production test bench,


- Participate in the qualification of the project,


- Present and promote your work internationally,


You will receive training in the above areas as required.

The position is to be filled in Marseille on a 24-month fixed-term contract.


Gross salary (30 000€ - 32 000€) according to experience.


Benefits include


- Hybrid teleworking


- Participation in the cost of transport


- Reduce working hours


- Catering


Please apply:

https://emploi.cnrs.fr/Offres/CDD/UMR7346-ANNPOR-108/Default.aspx?lang=EN


Keywords:
Electronique
Code:
CDD-2223-EL-01
Instrumentation
Characterization of large-format, low-noise hybrid infrared detectors for space applications within the framework of the PICA facility at CPPM.
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Internship supervisor:
Aurélia Szcroun - 04 91 82 72 15 - secroun@cppm.inp2p3.fr
Sorry, this position is no longer available
Description:

The Marseille Particle Physics Center is recruiting an instrumentation engineer to meet the needs for the characterization of very low-noise infrared detectors in its PICA (Infrared Characterization Plateau). Specifically, the plateau is currently involved in activities related to three space missions in which the laboratory is participating: the ESA's Euclid and Lisa missions, and the Franco-Chinese SVOM mission. The detectors tested on the plateau are cutting-edge hybrid detectors. Our characterization objective is to address the scientific performance requirements of the missions by conducting dedicated and mission-specific tests, and to provide rare expertise in infrared detectors to the projects.


MISSION

The PICA plateau has a dedicated set of test facilities for the characterization of low-noise infrared detectors typically used in space missions. It is equipped with an ISO7 clean room, an ISO5 hood for detector handling, and two fully automated vacuum-cooled test benches. It is complemented by a third test bench used for the development of new types of tests under more flexible environmental conditions. The excellent performance of these benches was demonstrated during the characterization of the 20 Euclid space mission flight detectors, making this plateau a rare installation in Europe. The plateau is now open to other laboratory projects and external requests (from laboratories and industry).


ACTIVITIES

The activities of the recruited engineer will be integrated into those of the PICA plateau, and he/she will contribute to ongoing projects (SVOM-GFT, Euclid, Lisa). In this context, the engineer will be responsible for:


proposing and contributing to the definition of test plans for the projects and conducting the characterization of low-noise detectors according to the defined plan;

taking control of the existing test benches in the ISO7 clean room at CPPM, as well as the infrared detector acquisition chain; as needed, expanding the benches by adding new capabilities, such as implementing absolute quantum efficiency measurements;

developing data analysis codes for characterization and preparing performance maps to be delivered to the projects for data processing;

optionally delving into the analysis of certain risk parameters such as persistence or non-linearity to meet project requirements.

The engineer will also be required to write reports in English and participate in project meetings.

PROFILE AND SKILLS

The engineer should have a strong technical background in instrumentation, with knowledge of low-noise detection and radiation-matter interactions, as well as practical experience. In particular, experience with detectors for astronomy (hybrid pixel detectors, photodetectors, and/or infrared instrumentation) would be appreciated. The engineer should also be able to take over existing analysis codes developed in Python and integrate their developments into the existing environment. Knowledge of the space environment, thermal techniques, vacuum, and experience in working in clean rooms would be additional assets.


GENERAL INFORMATION

Type of Contract: Fixed-term contract (Full-time)

Contract Duration: 2 years

Contract Start Date: Expected Hiring Date: As soon as possible

Remuneration: (monthly gross salary based on recruitment level)

Desired Educational Level: Minimum engineering degree or Ph.D.

Desired Experience:


WORK CONTEXT

Located in the heart of the Calanques National Park, on the Luminy campus, the CPPM is a research laboratory jointly operated by CNRS and Aix-Marseille University, with approximately 180 researchers, engineers, and doctoral students. The laboratory conducts research ranging from particle physics to astroparticle physics and cosmology, with strong technological expertise in electronics, mechanics, instrumentation, and computer science, enabling the design and construction of cutting-edge detection systems often operating in extreme conditions: in the depths of the sea, in space, or underground. Most of our research is conducted within leading international scientific collaborations, and our contributions are recognized worldwide. CPPM is committed to conducting ethical research and promoting diversity and inclusion in the workplace. Administrative and logistical support is provided to newcomers, particularly doctoral students. (For more details, visit: https://www.cppm.in2p3.fr/web/fr/index.html)


ADDITIONAL INFORMATION

Your CV (maximum 2 pages) and your motivation letter (1 page) must be uploaded on the CNRS portal. Please also attach 3 reference letters and the contact details of the referees.

Application Deadline: August 31, 2023

For further information, please contact (recruiters' names and email):

Aurélia Secroun, CNRS Research Engineer

Tel: 04 91 82 72 15 - Email: secroun@cppm.in2p3.fr


Keywords:
Instrumentation
Code:
CDD-2223-IS-01
KM3NeT
Informatic support of the acquisition system for the KM3NeT/ORCA submarine neutrino detector
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Internship supervisor:
V. Bertin / N. Lumb - +33 491 82 72 61 - bertin@cppm.in2p3.fr
Description:

Job type : Software engineer

Contrat : Full time CDD during 2 to 3 years


The CPPM plays a major role in the KM3NeT (Kilometre cube Neutrino Telescope) project, which aims to build a submarine neutrino detector at a depth of 2500 meters off Toulon. This detector called ORCA will offer vast scientific perspectives through two main aspects. On the one hand, it will allow to study the quantum properties of neutrinos, on the other hand, it will open a new window on the most violent phenomena of the universe (supernova etc...). The first 18 detection lines have been deployed and the scientific exploitation of the first data has started. The CPPM is in charge of the construction, the installation and the operation of the detector, as well as of the pluridisciplinary submarine infrastructure of the Laboratoire Sous-marin Provence Méditerranée (LSPM : https://www.cppm.in2p3.fr/web/fr/LSPM/). It also contributes to the data analysis and is responsible for the working group

eal-time analysis of KM3NeT. KM3NeT (https://www.km3net.org/) is an international Collaboration of 250 scientists and engineer from more than 50 laboratories in 14 countries.


The engineer insures the installation, the supervision and the maintenance of the data acquisition software of the KM3NeT/ORCA detector deployed offshore Toulon, in collaboration with the DAQ group of the experiment. The person also participates to the support and maintenance of the computing infrastructure of the control room of the Laboratoire Sous-marin Provence Méditerranée and KM3NeT/ORCA detector located in La Seyne-sur-Mer, in collaboration with the operation manager of the KM3NeT/ORCA detector. The engineer also participates to the development of online processing software of the detector data.


Competences :

Good knowledge of the computing environment as well as languages and software used in high energy physics (Linux, C++, Python, Java),

Mastering of software development methodologies (development, containers, installation, storage),

Mastering of the software life cycle,

Mastering of parallel computing,

Mastering of Database / WEB services architectures,

Enjoy working within an international team,

English level B2 (reference European framework for languages),

Mastering of written and oral presentation techniques,

The possession of a driving licence (permis B) is strongly recommended.


The position is part of the “Detector \& Data” service composed of about twenty persons. Travels in France or in foreign countries are foreseen on the experiment sites and for meetings of the KM3NeT international Collaboration.


Application : https://emploi.cnrs.fr/Offres/CDD/UMR7346-ANNPOR-105/Default.aspx?lang=EN


Keywords:
Informatique
Code:
CDD-2223-KM-01
Renoir
NISP instrument preparation and performance follow-up before and after the in-flight commissioning of the Euclid space mission.
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Internship supervisor:
S. Kermiche / S. Escoffier
Sorry, this position is no longer available
Description:

\textbf{Description})

The Centre de Physique des particules de Marseille (CPPM) is offering a position to work on the preparation and the verification of the performances of the Euclid NISP instrument, and its follow-up during the in-flight operations. Euclid is an international European Space Agency (ESA) mission, scheduled to be launched in 2023.


The scientific goal of the mission is to understand the nature of the dark matter and the dark energy that represent 95% of the content of the Universe. For that, Euclid will measure the shapes and the positions of tens of millions of galaxies thanks to two instruments, an imager in the visible domain, the VIS instrument, and a spectrophotometer observing the sky in the near infra-red domain, the NISP instrument.


The CPPM team is highly implied in the Euclid project, and has in charge the scientific responsibility of the spectroscopic part of the NISP. The team works on the ground and space based NISP data analysis and instrument calibration. The CPPM is also a major actor in the NISP infra-red detectors characterization and a part of the team works on the developments of the pipeline of the NISP spectroscopic simulations.


The hired person will join this team of experts on the NISP instrument. He/She will have the responsibility of the instrument and its performances follow-up, before and after the in-flight commissioning phase, starting just after the satellite launch. He/She will work as a support for the NISP Instrument Scientist, based at CPPM. This activity includes the preparation of the in-flight data analyses software, the validation of the calibration procedures and the performances verification of the instrument.


The position is to be filled as soon as possible, for a 1-year contract, renewable for two years in total.


\textbf{Competences})

The candidate must have:

Knowledge:

• A PhD degree in Physics, Astrophysics or a degree from engineer high school

• A good skill in software engineering

• A good knowledge of signal and images processing and statistical methods

\textbf{Know-how})

• Scientific data analysis and modelization

• A good knowledge of programming languages C/C++/Python

• A good skill of Linux/Unix operating system and virtualization methods

• English: Level C2 or C1 (Common European languages referential)

• Writing technical reports in English.

\textbf{Team Work})

• Ability to work within a team and in an international collaboration.


An expertise in instrumentation, spatial projects, or data reduction in astronomy/cosmology will be considered.

Recommendation letters are welcome


\textbf{Application})

Applications should contain a letter of interest and a CV to be sent to:

• Stéphanie Escoffier (escoffier@cppm.in2p3.fr)

• Smaïn Kermiche


Keywords:
Cosmologie observationnelle
Code:
CDD-2223-RE-01

PostDoc offer


Atlas
Postdoctoral position in ATLAS CPPM group
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Internship supervisor:
Thomas Strebler - +33 4 91 82 72 52 - strebler@cppm.in2p3.fr
Description:

The ATLAS group at CPPM Marseille invites applications for a postdoctoral position in the group. The two-year position in Marseille offers a competitive salary (2.8k€ - 3.3k€ gross / month) and is funded by the ANR DIVE project.


The study of the Higgs boson pair production is generating a growing interest in the particle physics community. In addition to the Higgs self-coupling, the VVHH coupling is also an important parameter to improve our understanding of the electroweak symmetry breaking, which can be probed through the search for di-Higgs events in the VBF production mode. Very strong constrains on this coupling can already be achieved with the LHC Run 3 dataset, in particular combining the low and high m(HH) regions. In order to guarantee a good sensitivity in the high m(HH) regime, dedicated identification algorithms targeting boosted Higgs decays are crucial.


The selected candidate will work in collaboration with other ATLAS members from CPPM, IJCLab and LPNHE in order to set up the first ATLAS analysis constraining the VVHH coupling in the bbtautau final state. They are expected to take a leading role in analysis activities and the development of innovative boosted H->tautau tagging algorithms. Experience in Monte Carlo simulation, object performance and data analysis is expected, as well as good programming skills, capability to effectively work in a team and willingness for business travel in accordance with the needs of our research.


Candidates must hold a Ph.D. in Physics since at most two years by the starting date, which is foreseen to be on 1st April 2023, and have research experience in experimental elementary particle physics. Applicants should apply at :

https://emploi.cnrs.fr/Offres/CDD/UMR7346-ANNPOR-097/Default.aspx?lang=EN

with a CV, a list of major publications highlighting personal contributions and a statement of research interests. At least two letters of recommendation should be sent to Thomas Strebler and Élisabeth Petit (strebler@cppm.in2p3.fr, petit@cppm.in2p3.fr). Informal enquiries are welcome and may be made to the same contact persons.


Keywords:
Physique des particules
Code:
PostDoc-2223-AT-01
KM3NeT
Postdoc on astroparticle physics and astronomy at IPhU, Aix-Marseille University
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Internship supervisor:
Damien Dornic - 04 91 82 76 82 - dornic@cppm.in2p3.fr
Sorry, this position is no longer available
Description:

The Institute for Physics of the Universe (IPhU, Aix-Marseille University) invites applications

for a young postdoc position (<2 years of experience) in the field of astroparticle physics and astronomy. She/he will be part of the A*MIDEX interdisciplinarity project NEXCOS (NEutrinos and X-ray follow-up for Cosmic-ray Source studies) to study cosmic neutrinos detected with the KM3NeT detector from active galactic nuclei (AGN).


Many hints on the association between high-energy neutrinos and bright active galactic nuclei (blazars and Seyfert galaxies) have been discovered by IceCube and ANTARES neutrino telescopes. All these nice results indicate that we are reaching the top of the iceberg of the individual source detection. Thanks to the unprecedented angular resolution, the extended energy range (GeV – >10 PeV) and the full sky coverage, KM3NeT will play an important role in the rapidly evolving multi-messenger field. End 2022, 15/21 detection units are in operation at the ORCA/ARCA site. At the end of 2023, the size of both detectors will more or less double. A good sensitivity over such a large energy coverage can be obtained by combining the data of the two detectors (ORCA-France and ARCA-Italy). KM3NeT will achieve a directional precision of <0.1 degrees for the muon neutrino tracks at very high energies, and <1.5º for the cascade events (from electron neutrino, tau neutrino charged current + all flavor neutrino neutral current interactions). With KM3NeT, we will be able to perform a very efficient all-flavour neutrino astronomy. Real-time multi-messenger campaigns are crucial in unveiling the sources of the most energetic particles and the acceleration mechanisms at work in active galactic nuclei. Neutrinos would provide insights into the physics of particle acceleration processes in relativistic jets and disc-corona systems. It relies on the quasi-online communication of potentially interesting observations to partner instruments (“alerts”), with latencies of a few minutes, at most. Such alerts are the only way to achieve simultaneous observations of transient phenomena by pointing instruments.


Among the neutrino group at CPPM, and in collaboration with LAM, the postdoc researcher will first have to develop efficient all-flavor cosmic neutrino event selections that identify a small number of interesting neutrinos from the bulk of atmospheric neutrinos and muons. Those selections will then be implemented in the real-time analysis framework of KM3NeT. Each selected event will trigger an alert sent publicly to the astronomer community. Then, the postdoc will participate to the organisation of the multi-wavelength electromagnetic follow-up, in particular with X-ray (Swift, SVOM, XMM-Newton, Chandra or NuSTAR) and optical (COLIBRI) observations. In this task, we expect that the postdoc takes a leading role in the follow-up with the SVOM mission. Finally, based on the spectral energy distribution, we expect to fit the data with the up-to-date hadronic models and derive constrains on the microphysics of the sources.


IPhU is a leading collaborative scientific research and education environment dedicated to the Physics of the Universe and associated technologies: from the infinitely small scales of particle physics, to the infinitely large ones of cosmology, with high-energy astrophysics in between. It brings together and synergizes the theoretical, observational and experimental skills of three laboratories in Marseille, internationally recognized in those fields. The postdoc will join the Centre de Physique des Particules de Marseille (CPPM) and the Laboratoire d'Astrophysique de Marseille (LAM), which are both part of IPhU. She/he will be located at CPPM. The postdoc will work under the supervision of Damien Dornic (CPPM) and Delphine Porquet (LAM). The neutrino group of CPPM has a leading role in the construction and exploitation of ANTARES and KM3NeT for more than 20 years.


The position is expected to start between April and July 2023, the exact starting date can be discussed. It will be funded for two years with a net monthly salary of about 2050-2300 euros (gross monthly salary of about 2550-2850 euros).


The applicants are expected to hold a PhD degree in high energy physics/astrophysics, at the time of the beginning of the postdoc contract. The candidate should have a strong interest in astroparticle physics and a good knowledge of high-energy astrophysics/physics data analysis. Expertise in AGN modelisation is a plus. Good practical skills in python and C++, and good knowledge of open software development environment (git, etc) will be an important asset. Ability to work in international teams and in large collaborations are highly recommended.


REQUESTED DOCUMENTS OF APPLICATION, SELECTION PROCESS [DEADLINE: June 1st, 2023]

o A motivation letter,

o Two reference letters (to be sent directly to dornic@cppm.in2p3.fr and delphine.porquet@lam.fr),

o CV and University grade transcripts (for all degrees)


WHERE TO APPLY

dornic@cppm.in2p3.fr \\\& delphine.porquet@lam.fr


Keywords:
Astroparticules
Code:
PostDoc-2223-KM-01
Multi-messenger analyses with KM3NeT, SVOM and COLIBRI telescopes.
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Internship supervisor:
Damien Dornic - +33491827682 - dornic@cppm.in2p3.fr
Sorry, this position is no longer available
Description:

The CNRS/IN2P3 is offering a young postdoctoral position (<3 years of experience) with a contract 2 years in the field of astroparticle physics and neutrino astronomy. The postdoc will join the Centre de Physique des Particules de Marseille (CPPM). She/he will participate to the KM3NeT, SVOM and COLIBRI Collaborations.

Neutrinos are unique messengers to study the high-energy Universe as they are neutral and stable, interact weakly and therefore travel directly from their point of creation to the Earth without absorption and path deviation. Many hints on the association between high-energy neutrinos and bright astrophysical sources (active galaxy nuclei, tidal disruption events, etc.) have been discovered by the IceCube and ANTARES neutrino telescopes. All these nice results indicate that we are now reaching the top of the iceberg of the individual source detection. Thanks to its unprecedented angular resolution, the extended energy range (10 MeV ? 10 PeV) and the full sky coverage, the new generation neutrino telescope KM3NeT will play an important role in the rapidly evolving multi-messenger field. End 2022, 15/21 detection units of KM3NeT are in operation at the ORCA/ARCA site. At the end of 2023, the size of both detectors will more or less double. A good sensitivity over such a large neutrino energy range can be obtained by combining the data of the two KM3NeT detectors (ORCA-France and ARCA-Italy). KM3NeT will achieve a directional precision of <0.1º for the muon neutrino tracks at very high energies, and <1.5º for the cascade events (from electron neutrino, tau neutrino charged current + all flavour neutrino neutral current interactions). With KM3NeT, we will be able to perform a very efficient all-flavour neutrino astronomy. Real-time multi-messenger campaigns are crucial in unveiling the sources of the most energetic particles and the acceleration mechanisms at work in active galactic nuclei. Neutrinos would provide insights into the physics of particle acceleration processes in relativistic jets and disc-corona systems. It relies on the quasi-online communication of potentially interesting observations to partner instruments (“alerts”), with latencies of a few minutes, at most. Such alerts are the only way to achieve simultaneous observations of transient phenomena by pointing instruments.

SVOM is a Franco-Chinese space mission (launch date scheduled end of 2023) to study the multi-wavelength emission of the most intense phenomena in the Universe and to assure the follow-up of the most interesting multi-messenger and multi-wavelength alerts. SVOM contains 2 large field of view instruments (ECLAIRs and GRM) and 2 narrow field instruments (MXT and VT). The particularity of this mission is that there is a very complex ground segment that contains several optical robotic telescopes. Among them, COLIBRI is a French-Mexican 1.3m robotic telescope equipped with 3 optical and NIR channels.


The neutrino group of CPPM is having a leading role in the construction and exploitation of the ANTARES and KM3NeT neutrino telescopes for more than 20 years. Among the neutrino group at CPPM, the postdoc researcher will mainly work in the online analysis platform of KM3NeT to put in place the neutrino alerts and the search for time/space correlation with external multi-messenger and multi-wavelength triggers. To do so, she/he will develop efficient all-flavor cosmic neutrino event selections that identify a small number of interesting neutrino events from the bulk of atmospheric neutrinos and muons. Those selections will then be implemented in the real-time analysis framework of KM3NeT. Each selected event will trigger an alert sent publicly to the astronomer community.


The postdoc will also participate to the organisation and the data reduction of the multi-wavelength electromagnetic follow-up observations performed with the SVOM and the COLIBRI telescopes. She/he will participate to the development of the image analysis pipelines that are used to perform the data reduction of the COLIBRI images and to look for the optical counterpart of the transients discovered by SVOM or any multi-messenger alerts. She/he will also participate to the target of opportunity program to trigger the SVOM MXT and VT instruments. As a member of the KM3NeT and SVOM collaborations, the postdoc will have to participate to the different shifts and service tasks of these different facilities.


The applicant should have a PhD at the start of the contract and a good background in astroparticle physics and astrophysics. Interest in the data analysis is expected together with knowledge of statistics. Good practical skills in python, C++ and Root, and good knowledge of open software development environment (git, etc) will be an important asset. Ability to work in international teams and in large collaborations are highly recommended.

The postdoctoral position is expected to start September 1st, 2023, the exact starting date can be discussed. It will be funded for two years with a net monthly salary of about 2320-2670 euros (gross monthly salary of about 2890-3320 euros).

The deadline for application is June 1st 2023. The applicant should provide:

o A motivation letter that states the research interests or a research proposal

o Curriculum vitae and University grade transcripts (for all degrees)

o Two reference letters to be sent directly to dornic@cppm.in2p3.fr and bertin@cppm.in2p3.fr


Keywords:
Astroparticules
Code:
PostDoc-2223-KM-02
Renoir
Postdoctoral Research Position in Cosmology
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Internship supervisor:
Stéphanie ESCOFFIER - 04 91 82 76 64 - escoffier@cppm.in2p3.fr
Description:

The Centre de Physique des Particules de Marseille (CPPM) invites applications for a two-year postdoctoral research position in cosmology. The position is dedicated to research related to the Dark Energy Spectroscopy Instrument (DESI) survey. The CPPM cosmology team is involved in future experiments such as DESI, Euclid, Vera Rubin/LSST, and the LISA experiment.


DESI is a ground-based experiment at the Kitt Peak National Observatory Mayall 4m telescope. Starting observations in 2021, DESI will conduct a five-year survey designed to cover 14,000 deg2 and to map the large-scale structure of the Universe by measuring 30 million redshifts. DESI will perform stringent cosmological tests and will allow definitive tests of gravitational physics by constructing a unique redshift-space (3D) map of the large-scale structure of the Universe.


The research areas include the study of large-scale structure of the Universe, with particular emphasis on galaxy clustering or cosmic voids. Candidates with experience in cross-correlation analysis or cosmological probes combination using Cosmic Microwave Background or gravitational lensing are strongly encouraged to apply. The applicant should have a Ph. D. in astronomy/astrophysics/high energy physics, with expertise in (but not limited to): galaxy clustering; theoretical cosmology; gravitational lensing; and observational analysis of large datasets.


Interested candidates are asked to submit a CV, a research statement and a list of publications into a single pdf file to Dr. Stephanie Escoffier, escoffier@cppm.in2p3.fr. Applicants should also arrange for three letters of recommendation to be sent directly to Dr. Stephanie Escoffier. For full consideration, the application and recommendation letters must be received before February 8th, 2021. The position is expected to begin in Oct. 2021.


For further information please contact Dr. Stephanie Escoffier escoffier@cppm.in2p3.fr.


Included Benefits:

French national medical insurance, maternity/paternity leave, lunch subsidies, family supplement for children, participation to public transport fees, pension contributions.

Note that school is free in France for all children above 3.

In addition, CNRS offers free French lessons.


Keywords:
Cosmologie observationnelle
Code:
PostDoc-2021-RE-01
Two postdoctoral positions in observational cosmology
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Internship supervisor:
Julian Bautista - bautista@cppm.in2p3.fr
Description:

The Aix-Marseille Initiative of Excellence of the A*Midex university foundation is funding two postdoctoral positions at the Centre de Physique de Particules de Marseille (CPPM) for a duration of two years (+ one year extension possible) in the topic of observational cosmology. These positions are funded in the context of the DARKUNI project (P.I. Julian Bautista) which overall goal is to learn about the dark sector of the Universe from observations of the large-scale structures. In particular, we aim to measure the growth-rate of structures from a joint analysis of redshift-space distortions and peculiar velocities. The CPPM is active member of spectroscopic surveys DESI and Euclid and photometric surveys ZTF and Rubin-LSST.


We welcome applications of highly skilled candidates with experience in cosmology, scientific computing, statistics and data analysis. Experience with data from spectro/photometric surveys and galaxy clustering is highly recommended. We value candidates with good communication skills, willing to work as a team and in the context of large scientific collaborations. Candidates should have a PhD degree at the time of the start of the contract.


The first selected candidate is expected to spend at least 50% of their research time on the data analysis of DESI and/or ZTF surveys. The second selected candidate is expected to spend at least 50% of their research time on the data analysis preparation of Euclid spectroscopic data.


The candidates should send to bautista@cppm.in2p3.fr the following items :


- CV


- Research statement (3 to 5 pages)


- List of publications


- Two reference letters to be sent directly by the recommenders


Application deadline: 31 October 2021


Included Benefits: French national medical/dental insurance, maternity/paternity leave, lunch subsidies, family supplement for children, participation to public transport fees, pension contributions. School is free in France for all children above 3. French lessons are also offered by the institution.


Keywords:
Cosmologie observationnelle
Code:
PostDoc-2122-RE-01
Post-doctoral position in observational cosmology to work on the Zwicky Transient Facility (ZTF) dataset
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Internship supervisor:
Benjamin Racine - racine@cppm.in2p3.fr
Description:

With its 47 square degree field of view camera, ZTF observes the northern hemisphere in three bands daily. Since mid-2018 it discovers, follows and types ~1000 type Ia supernovae per year at z<0.1. This makes ZTF the largest homogeneous, spectroscopically complete, sample to date. This golden sample can unlock unprecedented cosmological tests, such as an independent measurement of H0 and its isotropy, the first direct measurement of f?8 at z~0 from SNe Ia peculiar velocities, which provides a test of Einstein's general relativity at cosmological scales. Combined with the current SN samples at higher redshifts, the ZTF supernovae will give the first non marginal constraints on a variable equation of state of Dark Energy.


The successful applicant shall dedicate ~30% of their time to the general effort of the ZTF-group to help build the SN light curves and extract distances. The remaining 70% will be available to cosmological analyses.


The position is funded by the French Agence nationale de la Recherche (ANR). The CPPM is working within the ZTF-IN2P3 National project which gathers ~30 researchers, postdocs and students. It is also active in LSST and DESI. The successful applicant may have the opportunity to join any of these collaborations.


The position includes a research allowance, including travel money and access to the CNRS-IN2P3 Computing Center.


Applicants must have a PhD in cosmology, astrophysics, data science or a related field. Applicants are asked to submit a CV, a research statement, a list of publications and arrange for three letters of recommendation to be sent directly to Benjamin Racine and Dominique Fouchez (racine@cppm.in2p3.fr, fouchez@cppm.in2p3.fr)


Keywords:
Cosmologie observationnelle
Code:
PostDoc-2223-RE-01
Machine learning for modelling the instrumental response of the NISP instrument
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Internship supervisor:
William Gillard - +33 4 91 82 76 67 - gillard@cppm.in2p3.fr
Description:

The Euclid space mission (https://www.euclid-ec.org) was launched on July 1st, marking the beginning of a new era in cosmological research. In this regard, we announce the opening of a post-doctoral research position in machine learning for modeling the instrumental response of the NISP instrument.


The NISP instrument is a slitless spectrometer consisting of the largest infrared focal plane sent into space to date. With its wide field of view, NISP captures the spectrogram of all sources within its observational field, covering an angular surface equivalent to the apparent size of the Moon. The instrument's extensive field of view, combined with numerous sources, poses a challenge for conventional simulators to realistically model the images necessary for cosmological analyses within limited time frames.


Advancements in generative Machine Learning methods offer new application prospects. The ANR DISPERS project (2022-2026, https://dispers.pages.in2p3.fr/website) aims to develop slitless spectroscopy simulation tools based on deep learning for the Euclid space mission and future large cosmological surveys. This initiative opens new opportunities for planning cosmological surveys, analyzing instrumental error sources, and applying methods used for spectrum decontamination.


The selected candidate will play a central role in developing an innovative simulation tool aimed at transforming the way large galaxy surveys are analyzed. The simulator's primary objective is to realistically model the response of the NISP instrument, leveraging recent machine learning algorithms, advanced statistical techniques, and numerical optimization formalisms. The simulator aims to create precise simulations capturing the subtleties of both instrumental and astronomical phenomena, contributing to enhancing our understanding of Euclid data and future surveys.


The postdoctoral researcher will specifically contribute to various aspects of the project:

· Develop and implement machine learning algorithms for modeling instrument responses, in collaboration with team members.

· Apply advanced statistical and machine learning techniques to analyze mission data.

· Contribute to the design and execution of experiments, simulations, and data analyses.

· Participate in the validation and calibration of simulation tools using Euclid mission data.

· Contribute to research publications, conference presentations, and scientific workshops to disseminate research findings.

· Collaborate with doctoral students, researchers, and engineers in the project to promote a collaborative and innovative research environment.


Skills:

· Ph.D. in astrophysics, computer science, or a related field, with expertise in machine learning or computational astrophysics.

· More than two years' professional experience.

· Strong experience in machine learning, statistical modeling, and data analysis, with applications in astrophysics or related fields.

· Skills in the Python programming language and libraries such as TensorFlow, PyTorch, JAX, or similar, for implementing machine learning algorithms and GPU computing.

· Experience in instrument modeling, image simulations, or related fields would be a significant advantage.

· Practical experience with Physics-Informed Neural Networks (PINNs) and/or transfer learning methods would also be a major asset.

· Soft skills enabling collaborative daily work, coupled with a high degree of autonomy in tasks.

· Excellent analytical skills and problem-solving abilities.

· Outstanding communication skills, including the ability to present research results clearly and concisely.


Additional Information:

Your CV (maximum 2 pages), your cover letter (1 page), your research statement (3 to 5 pages), and your list of publications must be uploaded to the CNRS portal.

https://emploi.cnrs.fr/Offres/CDD/UMR7346-ANNPOR-119/Default.aspx?lang=EN

Three recommendation letters should be sent directly to William GILLARD gillard@cppm.in2p3.fr.


Keywords:
Cosmologie observationnelle
Code:
PostDoc-2324-RE-01
imXgam
Postdoctoral Research position on learning methods for hadrontherapy in imXgam
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Internship supervisor:
Yannick Boursier - 04 91 82 76 41 - boursier@cppm.in2p3.fr
Description:

Contract Period : 24 months

Expected date of employment : September 2021

Proportion of work : Full time

Remuneration : Between 2728 et 3145 euros according to experience

Desired level of education : PhD

Experience required : Indifferent


Missions


The research work is part of the TIARA project, which aims to provide an instrumental, methodological proof of concept on real data of the real time monitoring of the emission distribution of Gamma Prompts (GPs) in the context of hadrontherapy. A detection system placed around the patient - composed of an hodoscope and gamma detectors with a temporal resolution of 100 ps - provides time of flight measurements of the particles involved in the treatment. The first objective of the proposed mission is to exploit these data to be able to detect as soon as possible a significant divergence between the real treatment and the treatment plan (simulated upstream), and to stop the treatment if necessary. The final goal is to be able to estimate the distribution of GPs' vertices with a sufficient accuracy to adjust the treatment in real time with respect to the treatment plan. Access to this type of information could also pave the way for measuring the actual dose distribution delivered.


Activities


He/she will develop a research activity at the interface between data sciences and medical physics in order to explore applications of artificial intelligence for time-of-flight data in hadrontherapy. He/she will pursue the following main objectives: i) to improve our approach to 3D GPs vertex reconstruction based on an optimization problem that incorporates the physics of hadrontherapy (e.g. by analyzing simulated and real available data in order to incorporate suitable regularizations like low-rank+sparse). The results obtained at this stage will allow in particular to optimize the design of the instrument for a maximum spatial resolution; ii) to evaluate the contribution of machine learning and deep learning methods to jointly estimate the 3D distribution of GP vertices and the anatomical changes (i.e. of electron density) between the time of the treatment plan and the time of the actual treatment. This essential quantity is often estimated beforehand with significant uncertainties that must be compensated. Different strategies will be studied (transfer learning, use of Generative Adversarial Networks) and the most relevant ones will be evaluated on real data with the feedback of physicians and radiophysicists.


Skills


The candidate should have operational skills in data science, optimization methods and/or machine or deep learning.

Interest in applications in the medical field will be appreciated. Knowledge of the context and/or science of medical physics, specifically radio/hadron therapy will be appreciated.

Ability to work in an interdisciplinary environment.


Work Context


The researcher will be part of the TIARA project (Time-of-flight Imaging ARrAy for real-time monitoring in hadrontherapy) financed by the Inserm Cancer Plan, PCSI 2020 (Physics, Chemistry or Engineering Sciences applied to Cancer), a tripartite collaboration between the Laboratoire de Physique Subatomique \\& Cosmologie (LPSC) in Grenoble, the Centre de Physique des Particules de Marseille (CPPM) and the Centre Antoine Lacassagne (CAL) in Nice. In this project, the CPPM is responsible for the development of the data processing methodology.

He/she will benefit from the multidisciplinary, rich and stimulating work environment of the imXgam team, the CPPM and the Luminy Campus, including access to the know-how and computing facilities of the IN2P3 Computing Center.


Constraints and risks


The research work will be done in close collaboration with the LPSC team specialized in hadrontherapy physics and will require 1-2 days working visits at LPSC, Grenoble and CAL, Nice.

Additional Information


For more information, contact Yannick Boursier (boursier@cppm.in2p3.fr).


Application here : https://bit.ly/36n0skG


Keywords:
Imagerie médicale
Code:
PostDoc-2021-IM-02

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