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 -


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.


The candidate must have:


• 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


• 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


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

• Stéphanie Escoffier (

• Smaïn Kermiche (

Cosmologie observationnelle

PostDoc offer

Postdoctoral position in ATLAS CPPM group
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Internship supervisor:
Thomas Strebler - +33 4 91 82 72 52 -

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 :

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 (, Informal enquiries are welcome and may be made to the same contact persons.

Physique des particules
Postdoc on astroparticle physics and astronomy at IPhU, Aix-Marseille University
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Internship supervisor:
Damien Dornic - 04 91 82 76 82 -

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.


o A motivation letter,

o Two reference letters (to be sent directly to and,

o CV and University grade transcripts (for all degrees)


Postdoctoral Research Position in Cosmology
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Internship supervisor:
Stéphanie ESCOFFIER - 04 91 82 76 64 -

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, 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

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.

Cosmologie observationnelle
Two postdoctoral positions in observational cosmology
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Internship supervisor:
Julian Bautista -

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 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.

Cosmologie observationnelle
Postdoctoral Research position on learning methods for hadrontherapy in imXgam
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Internship supervisor:
Yannick Boursier - 04 91 82 76 41 -

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


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.


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.


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 (

Application here :

Imagerie médicale

Apprentice offer

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CNRS job offer

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