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Accueil > A propos du LPP > Communication > Actualités archivées > 2012 > Kickoff of four successful LPP led proposals selected by ANR (French National Research Agency)

Kickoff of four successful LPP led proposals selected by ANR (French National Research Agency)

Four proposals dealing with different plasma physics items have been selected by ANR, giving thus support for the three forthcoming years.
EPIC – (Strongly Electronegative Plasmas for Innovative Ion Acceleration) - Ane Aanesland coordinator- looks at plasmas consisting of negative and positive ions. PLASMAFLAME (Kinetic and hydrodynamic effects in plasma-flame interactions), Svetlana Starikovskaia coordinator- focuses on a comprehensive fundamental, experimental and numerical study of the influence of low temperature non-equilibrium plasma on combustion process. SEDIBA (Simulation of Effective data and Diagnostic Signals at the Boundary of Tokamak Plasmas- Pascale Hennequin coordinator –aims at better understand turbulence that prevails at the boundary of Tokamaks by comparing in situ diagnostics and numerical simulations results, in order to prepare ITER project. THESOW (Turbulence and HEating in the SOlar Wind), proposed by Fouad Sahraoui in the frame of “young scientists proposals” is devoted to the understanding of the role of turbulence in heating and accelerating the solar wind particles example of astrophysical plasma.
Those different studies, coordinated by LPP scientists, are undertaken in partnership with other French laboratories.
 
 
EPIC - Strongly Electronegative Plasmas for Innovative Ion Acceleration
Coordinator : Ane Aanesland


In several low-temperature plasma applications, it is desirable to generate plasmas with very few or even no electrons (ion-ion plasmas). In microelectronics for instance, plasma etching may generate surface charging due to hot electrons, leading to damages in the patterned circuit. In plasma thrusters, electrons expelled outside the engine to neutralize the ion beam also produce charging of the satellite.
The EPIC project goal is to develop a profound understanding of the physics of ion-ion plasmas. Fundamental questions will be addressed with the main focus on the continuous formation of these plasmas, their interaction with biased surfaces immersed in the plasma and how positively and negatively charged ions from these plasmas can be manipulated by alternately biased electrodes or grids.
The EPIC project will allow the development of high-density ion-ion plasma sources and provide the required knowledge for developing an innovative alternate ion acceleration technology. The advantage over existing state-of-the-art acceleration technologies is that both positively and negatively charged ions are accelerated from the same source, and therefore reduces the problems with charging damage of surfaces or downstream neutralization.
The project will be based on sophisticated experiments, analytical models and numerical simulations in the frame of fundamental research. To ensure success experts from three French laboratories (LPP, ICARE (CNRS, Orléans), LAPLACE (CNRS, Université Paul Sabatier Toulouse) are brought together to bring the knowledge and know-how not available in a single laboratory.
Three post-doctoral positions will be available at the three institutions involved during the project period.
 
 
PLASMAFLAME - Kinetic and hydrodynamic effects in plasma-flame interactions
Coordinator : Svetlana Starikovskaia


Ignition of fuel-containing mixtures is an important problem in fundamental and applied combustion research. The Project PLASMAFLAME focuses on a comprehensive fundamental experimental and numerical study of the influence of low temperature nonequilibrium plasma on combustion process. Ignition and combustion, which are sustained by non equilibrium plasma, are caused by the interaction of a number of physical and chemical phenomena. To give an adequate physical description of plasma-assisted ignition/combustion it is necessary to combine detailed fundamental knowledge in gas discharge physics, hydrodynamics, and chemical kinetics.
In addition to the broad fundamental goals, the proposed Project will also reflect many of the stated ANR criteria for broader impact. In particular, the improved understanding of the principles of ignition and combustion control by nonequilibrium plasma will help develop high pressure plasma research in France, potentially enabling a wide variety of applications such as ignition and flame stabilization in fast flow reactors, flame control under conditions of lean combustible mixtures, initiation of ignition in the operating conditions of homogeneous charge compression ignition engines and so on. Finally, the results obtained will culminate in practical testing in a real automotive engine facility to assess the impact of the advances obtained in the project.

 
 
SEDIBA Simulation of Effective data and Diagnostic Signals at the Boundary of Tokamak Plasmas
Coordinator : Pascale Hennequin


One of the major challenges of ITER is related to edge turbulence, which plays an important role in plasma wall interactions. The latter control both the lifetime of wall components and the fusion performance to some extent. As a result, large theoretical and experimental efforts are put in the development of numerical simulations of edge turbulence — with a new generation of full torus 3D codes including the physics of plasma wall interaction — and the experimental validation of these codes – with the development of a full set of diagnostics allowing the measurement of edge plasma fluctuations : probes, ultra-fast CCD cameras, fast sweeping reflectometry and scattering diagnostics. The aim of the project is to provide a proper framework for effective quantitative comparison of experimental observations to simulations, which remains challenging : complexity of the geometry of the edge plasma, of the physics at play, interpretation of the diagnostic. The most direct solution to close this gap is to rely on forward modelling, i.e. on the implementation of synthetic diagnostics in the simulations, which will revisit the interpretation of the measurements. This will provide valuable data for unresolved issues, such as for instance the 3D structure and the dynamics of turbulence, notably the origin and structure of filaments propagating through the outer edge of the plasma, the interaction of flows with turbulence. The project gathers teams from LPIIM Marseille, IRFM- Cadarache, IJL - Nancy and LPP – Palaiseau.
 
 
THESOW Turbulence and HEating in the SOlar Wind
Coordinator : Fouad Sahraoui


The project’s goal is to elucidate the process of dissipation of turbulence in the solar wind and its role in the mechanisms of heating and particle acceleration. These problems are at the heart of the space missions under preparation, such as ESA / Solar (2017) Orbiter and NASA / Solar Probe Plus (2019), in which the LPP is heavily involved. We will use a multiple approach combining the analysis of the data from the space missions ESA/Cluster and NASA/Themis, the numerical simulations (using the 3D Landau-fluid code) and theoretical/analytical modeling in the fluid (Hall-MHD, EMHD ) and kinetic theories. The expected results will certainly improve our understanding of turbulence in the solar wind and other astrophysical plasmas, more distant and less accessible to in-situ measurements.
The project will involve researchers with complementary skills from three laboratories (LPP, IAS and Obs. De la Côte d’Azur). Two post-docs (2 years each) will be funded under this project.


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Tutelles : CNRS Ecole Polytechnique Sorbonne Université Université Paris Sud Observatoire de Paris Convention : CEA
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Directeur de la publication : Pascal Chabert (Directeur)