Recruitment

Each year, Plas@Par recruits several post-doctoral fellows for a period of 1 year (renewable 1 time) and PhD students for a period of 3 years.
We also provide grants for incoming and outgoing Master students.

We welcome applications from excellent and highly motivated candidates of all nationalities. The candidates will be integrated in internationally renowned research groups within the Plas@Par community.

Post-doctoral positions and PhD positions are generally proposed from February/March each year.

Post-doctoral positions:
The candidate will be hired by University Pierre and Marie Curie, Paris. The gross salary is around 2700 €/month  (2200 € net), in the case of a starting researcher. It includes Social Security and other various charges. Applications of experimented researchers are also welcome.

PhD Positions:
We encourage applications from candidates with a diploma/master degree. Application deadline is generally at end of May. The appointment will start begining of October. The gross salary is around 1900 €/month  (about 1500 € net) includes Social Security and other various charges.

Other Positions:
Plas@Par offers other positions.

visu05

 

Intern - Diagnostics for a 3D Adaptive Mesh Refinement Hybrid PIC code

 

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To apply send an email to Mathieu Drouin

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Context

Hybrid-PIC codes are well suited to model cross-scales problems where the ions can be treated as macro-particles, while the electrons are modelled as a fluid. Such approach is of great interest to many problems in laboratory and astrophysical plasmas, where the electron temporal and spatial scales do not need to be resolved, while retaining a kinetic treatment of ions is necessary. In this internship, the student will be part of the team working on the code development project PHARE funded by the Labex PLAS@PAR. This multi-laboratory (LPP, LERMA, LULI, ONERA, ICSD) collaboration aims at developing the next generation of massively-parallel, adaptive mesh hybrid Particle-In-Cell code for the modelling of laboratory and astrophysical plasmas. The goal is to have excellent parallel scaling over several 10k cores. To tackle this problem, we are planning to rely on an external Adaptive Mesh Refinement (AMR) C++ library (SAMRAI) which scales efficiently over a million cores. The code is written in C++11 and its architecture is based on standard design patterns. The development involves a team of researchers and engineers. It follows strict code review, unit testing (using google test API), and continuous integration, to ensure code quality.

Objectives of the internship

The goal of this internship is to develop a module in the code for writing simulation outputs. Field and particle output will be considered with various time and spatial sampling strategies. The code will ultimately let the user choose the file format (either HDF5, OpenPMD etc.). Therefore several CoDecs have to be implemented according to a common abstract diagnostic interface. The student will work on implementing one concrete codec (for instance the HDF5 codec). The codec will be developed and benchmarked to ensure good parallel scalability and performances.

Candidate profile

The successful candidate :

● knows C++ programming language, POO and design patterns

● has a good knowledge of interpreted language Python

● is familiar with physics/mathematics

● is strongly motivated by high performance computing

● is autonomous, rigorous

 

Duration

6 months maximum

Location: LERMA, Université Pierre et Marie Curie, 75005 Paris

Contacts: mathieu.drouin@obspm.fr , nicolas.aunai@lpp.polytechnique.fr

Postdoctoral offer n°1

Formation, structure and feedback of 3D plasmoids in solar eruptions

The successful candidate will investigate investigate one of the most challenging question in solar physics : How do the small-scale processes developing in 3D flare current sheets impact the dynamics and energetics of large scale coronal mass ejections (CMEs)?

Contacts:

Guillaume Aulanier / Sophie Masson

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Project description:

The solar group of LESIA at Paris Observatory offers a two-year post-doctoral position to investigate one of the most challenging question in solar physics : How do the small-scale processes developing in 3D flare current sheets impact the dynamics and energetics of largescale coronal mass ejections (CMEs)? Answering this question is critical for understanding how CME’s are initiated and how magnetic reconnection affects, if not controls, these explosive phenomena. In this context, the successful candidate will primarily work (1) on achieving realistic 3D line-tied MHD numerical simulations of CME triggering and development, at sufficiently high resolution to obtain the development of the tearing mode in 3D, (2) on analyzing its nature and its non-linear development, and (3) on quantifying its feedback on the eruption itself. The second aspect of the post-doc appointment will consist in confronting the simulation results with EUV and SXR observations from STEREO, SDO and Hinode. The successful candidate will work with G. Aulanier and S. Masson as well as E. Pariat and P. Démoulin.

Requirements for the candidate:

The candidate should hold a PhD in solar physics or equivalent. She/he should have a strong interest and skills in reconnection theory and numerical studies, and be concerned by the observational constrains.

Location and starting date

LESIA is located at Observatoire de Paris-Meudon, Meudon (France). Expected start: No later than December 1, 2017

 

Applications with CV, list of publications, copies of degree diplomas, two reference letters, and statement of motivation. We will start to review applications on March 1, 2017 until the position is filled.

 

Contacts:
Guillaume Aulanier / Sophie Masson

Postdoctoral offer n°2 

Physics and chemistry of high pressure pulsed discharges for triggering of chemically active systems

The post will require a high level of expertise in laser spectroscopy; knowledge of plasma physics; knowledge of the basis of numerical modelling; excellent background in general physics and mathematics; capacity to work in the team and to be a leader.

Supervisors Svetlana Starikovskaia  (LPP)

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Project description:

Low temperature nonequilibrium pulsed plasma at elevated pressures is an efficient tool for influencing chemical kinetics, allowing to target different applications, from plasma medicine to plasma assisted combustion. Nanosecond discharges provide the unique possibility to keep high transient electric fields for at least tens of nanoseconds producing highly nonequilibrium densities of electronically excited and dissociated species. A little is known about energy transfer in nanosecond plasmas at atmospheric pressure; and kinetics of discharges in reacting mixtures at high gas densities is not developed yet. Nanosecond capillary discharge at P=1 atm and surface dielectric barrier discharge at P=1-15 bar will be studied. Resolved in time and space E-field and electron density will be measured. Planar N2+ LIF will be used to visualize zones of high electric field at increasing pressure with the aim to explain physical nature of filamentation. O-atoms TALIF together with absolute emission spectroscopy of excited N2 molecules will be used to follow kinetics of dissociation in the afterglow. Laser spectroscopy part of the Project will be developed in a strong collaboration with the University of York, UK, where the PostDoc will spend up to 6 months during the Project. Development of the kinetic scheme and 2D modeling will be carried out in collaboration with Moscow Institute of Physics and Technology, Joint Institute of High Temperatures RAS and Moscow State University within Project LIA KaPPA, “Kinetics and Physics of pulsed Plasmas and their Afterglow”. The main results will be new knowledge of discharge development in atmospheric pressure N2:O2 and He(Ar:)O2 mixtures and in high pressure (below 15 bar) hydrocarbon-containing mixtures at high electric fields, as well as kinetic mechanism of energy exchange for considered experimental conditions.

 


Contract type: 24 months full time (12 months period with renewal opportunity of 12 months)

Requirements for the candidate: The post will require a high level of expertise in laser spectroscopy; knowledge of plasma physics; knowledge of the basis of numerical modelling; excellent background in general physics and mathematics; capacity to work in the team and to be a leader.

Location and starting date: Laboratory for Plasma Physics (www.lpp.fr), Ecole Polytechnique, Palaiseau; start date negotiable but ideally by September 2017. Applications with CV, copies of degree diplomas and grades, two reference letters, and copies of any previous research-related work statement of motivation.

The application should be sent by e-mail to: svetlana.starikovskaya@lpp.polytechnique.fr

 

Postdoctoral position offer n°3 POSITION FILLED

CAPATOCHOL - Cold Atmospheric Plasmas Applied to the Treatment of Cholangiocarcinomas

After the validation of cold plasma efficacy on in vitro cell model, the relevance of treatment with cold plasma will be tested in vivo in xenograft tumor model performed in immunodeficient mice after implantation of CCA cell lines. Two xenograft tumor models (subcutaneous and orthotopic) will be used in which PAM treatment will be compared to that of GEMOX.

Supervisor T. Dufour  (LPP).

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Project description:

Cholangiocarcinoma (CCA) is a type of liver cancer, i.e. a heterogeneous group of malignancies that can emerge at every point of the biliary tree. To date, the unique effective therapy, surgical resection, is only possible in 20% of cases. After curative surgery, 5-year survival rate of CCA patients varies among 15-40%. Since innovative treatments are highly expected and since plasma medicine has already been successfully applied to other carcinomas, the CAPATOCHOL project aims to apply cold atmospheric plasma (CAP) sources on CCA. Cold Atmospheric Plasma (CAP) is a weakly ionized gas composed of electrons and ions but also of neutral species (radicals, excited atoms and molecules) and radiation. The electrons are sufficiently energetic to induce molecular dissociation reactions and energetic excitation hence producing radical species of interest but also radiation (UV, visible) as well as electric field.

FUNCTIONS

The Task 1 deals with the engineering of plasma sources dedicated to CCAs treatment. In close collaboration with the LPP team engineer, the post-doctoral researcher will design three types of plasma sources adapted to CCAs morphology: a topo-DBD, a plasma jet and an endoscopic plasma gun. She/he will strongly interact with physicists and chemists from LPP team in charge of plasma characterization to figure out which chemical/physical plasma properties present the best therapeutic plus-value. The task 2 deals with in vitro assays performed on culture cell models. Eight human CCA cell lines will be investigated, all displaying well-characterized phenotype and molecular features representative of CCA diversity. They will be tested for their responsiveness to GEMOX. Cells will also be treated with cold plasma, alone and in combination with GEMOX. We will also compare efficacy GEMOX vs cold plasma in GEMOX-sensitive CCA cells to evaluate whether cold plasma could present a greater advantage. Finally, plasma will be applied following two contact approaches: (i) a direct contact approach where CCAs are exposed to the cold plasma and (ii) an indirect contact approach where CCAs are exposed to a biological medium previously treated by a cold plasma. To study the impact of these plasma-activated media on cancer line, the post-doctoral researcher will elaborate protocols dedicated to the activation of PBR, RPMI, DMEM. After the validation of cold plasma efficacy on in vitro cell model (Task 2), the relevance of treatment with cold plasma will be tested in vivo in xenograft tumor model (Task 3) performed in immunodeficient mice after implantation of CCA cell lines. Two xenograft tumor models (subcutaneous and orthotopic) will be used in which PAM treatment will be compared to that of GEMOX.

Requirements for the candidate

The candidate will hold an experimental PhD in chemistry or biology/oncology with a strong motivation for translational research. In addition to excellent social skills, she/he will demonstrate independence in her/his research works and show abilities for scientific dissemination (writing scientific articles/reports, conferences).

Location and starting date

Paris, UPMC, 4 place Jussieu, 01/10/2017

Apply: Applications with CV, copies of degree diplomas and grades, two reference letters, and copies of any previous research-related work statement of motivation. The application should be sent preferably by e-mail to: thierry.dufour@upmc.fr

 

PostDoc Offer n°4

Plasmonics in ultra-relativistic regime

The project aims at exploring the generation of fast particles in relativistic laser-solid interaction by using properly-structured targets whose surface characteristics allow surface plasma wave (SPW) excitation in regimes of laser intensity ranging above 1021 W/cm2.

Supervisors:  michele.raynaud-brun@polytechnique.edu  / caterina.riconda@upmc.fr

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Project description:

The project aims at exploring the generation of fast particles in relativistic laser-solid interaction by using properly-structured targets whose surface characteristics allow surface plasma wave (SPW) excitation in regimes of laser intensity ranging above 1021 W/cm2. We have been performing for many years exploratory studies on the subject of laser overdense plasma interaction and resonant excitation of surface plasma waves, both by PIC simulations, test particle simulations and other theoretical studies. These works which were done in the regime 1018-1020 W/cm2 have been successful to motivate experimental works which have definitely shown the interest in using SPW excitation to get energetic electrons and ions. Optimizing the laser plasma coupling via the excitation of surface-wave-like or localized electromagnetic modes in highly-relativistic regimes needs a complete understanding of the physical processes that are involved and which give rise to the high-energy electron emission. The possible role of radiation friction in this new regime and in this situation where SPW excitation generates local field higher than the laser one in particular needs to be explored. On the modeling side, we remind that even if various numerical and theoretical studies have been performed so far, a full theory of relativistic SPW is still lacking and finding a simple scaling law that allows to predict the hot electron characteristics, remains a challenging task.

During the project the successful candidate will study the “upgrade” of Relativistic Plasmonics physics toward intensity regimes of magnitude larger than the typical values used in ordinary plasmonics, and such that nonlinear and relativistic effects play a major role. He/she will work at establishing relevant scaling laws and at getting an overall view of the SPW resonant excitation mechanisms, and of the resulting electron acceleration, in the highly-relativistic regime ranging from 1021 to 1022W/cm2. Extensive full Particle-in-cell (PIC) 2D simulations of the laser-overdense plasma interaction when the conditions for the resonant excitation of the SPW are satisfied will also be realized. Applications can be ultra-short synchronized light and electron sources for probing ultrafast electronic processes. One of the goals of this theoretical and numerical study is to suggest new experimental schemes feasible on the next-coming Apollon facility and multi-PW lasers.

 

Requirements for the candidate:  The successful candidate should hold a PhD in Plasma Physics, and if possible have some experience in PIC simulations and Laser-Plasma Interaction. He/she should have a strong interest in theoretical and numerical studies and be motivated by high performance computing. He/she should be autonomous, rigorous, and have good communication skills. Good skills in both written and oral English are also required.

Location and starting date:  The successful candidate is supposed to spend equal time in the two laboratories, that are in two different locations: LULI in Paris Center (Université Pierre et Marie Curie) and LSI in Palaiseau  (Ecole Polytechnique). The precise time organization will be agreed together. 

Expected start: no later than November 1st 2017.

The application should include:
- Cover letter
- CV specifying past research experience
- Copies of degree diplomas and Master grades
- Publication list
- 2 reference letters to be sent separately to the electronic address below

The application should be sent preferably by e-mail to: michele.raynaud-brun@polytechnique.edu  / caterina.riconda@upmc.fr