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The Laboratoire de Physique des Gaz et des Plasmas



Presentation of the laboratory - the research at the LPGP



The Laboratoire de Physique des Gaz et des Plasmas (LPGP) in Orsay, founded in the 60's, develops activities in the domains of fundamental, experimental and theoretical research.

The resulting applications are of primary interest to industry in the fields of surface processing and environment. Located in the campus of Université Paris-Sud, the LPGP is the oldest plasma physics laboratory in France. It is also one of the largest with a staff of about 75 people. The main site of the LPGP is located at the Centre Scientifique d'Orsay and one of the LPGP teams is situated at Gif-sur-Yvette in the buildings of the École Supérieure d'Électricité (SUPELEC).

The activities of LPGP cover a broad field ranging from high temperature plasmas with fields such as inertial or magnetic confinement fusion, laser plasma interaction and magnetospheric plasmas, to lower temperature, non-equilibrium plasmas. The interest of those plasmas is due to the fact that the various constituting species (electrons, ions, atoms or neutral molecules) have very different energies allowing to achieve ionization of the gaseous medium, strong reactivity of the created species and low temperature of heavy particles.



A plasma is an ionized gas. Ionized meaning that some electrons have been dissociated from the atoms or molecules. Due to the presence of free electric charges (electrons and ions) the plasma has specific properties, in particular it responds strongly to electromagnetic fields. Most part of the universe is in a plasma state (sun, stars, interstellar durst, magnetosphere, lightning, interstellar durst …)Laboratory plasmas are studied for a very broad range of applications : new sources of energy based on nuclear fusion reactions and new technologies (micro-electronics, high efficiency lamps, surface treatment and coating, plasma propulsion, gas treatment and depollution).


 

Research teams:



DEA - (Equipe Décharges Electriques et Aérosols) -

 

Fondamental objectives and applications

  • Lightning detection and protection against lightning
  • Electro-thermal characterization of electrical discharge and simulation
  • Nanoparticle production by nucleation in electrical discharges
  • Aerosol charging for aerosol size and concentration measurement tools
  • (Bio)-functionalized thin layers by post discharge polymerisation

Research thematic area

The team “Décharges Electriques et Aérosols”, based on the campus of SUPELEC, foccusses on electrical discharges at atmospheric pressure.
The first thema (“foudre”) deals with lightning detection and protection against lightning (1 researcher).
The second thema is related to “aerosol production and processing by electrical discharges” (PADEPA, 3 researchers) aims at developing plasma processes to produce, process and characterize solid/liquid particles in suspension in gases (aerosol). At the interface between plasma and aerosol sciences, these results have numerous fields of application for Environment (aerosol size and concentration measurement) and Materials (powders, nano-materials, thin layers).
  • The operation Procédé Aérosol et Décharge Electriques à Pression Atmosphérique (PADEPA) on discharges for aerosol processes
  • The operation FOUDRE on storm detection for industry.

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DIREBIO - Décharges Impulsionnelles, REactivités à haute pression, et interfaces plasma-BIOlogie

(english text will follow here)

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ITFIP - Interaction et Transport de Faisceaux Intenses dans les Plasmas


Fundamental objectives and applications


    The ITFIP team activity covers fundamental and exploratory research, making use of large scale facilities, to perform experimental and theoretical studies of laser-plasma interaction in the strong field regime, and of laser propagation and guiding at ultra-high intensity in plasma media. The main applications domains are the acceleration of particles to ultra-relativistic energy in under-dense plasmas, the development of new coherent, soft X-ray sources created by short pulse laser and inertial fusion.


The ITFIP is actively pursuing modelling and experimental studies of electron acceleration driven by laser wakefield in plasmas.  Several key issues for the development of future accelerators are being studied, such as intense laser guiding inside waveguides, the design of new plasma cells,   physical mechanisms for trapping and accelerating electrons in a plasma wave for multi-stage laser plasma accelerators. This work is undertaken in the frame of the electron acceleration scientific programme of  the CILEX project, and contributes to the design of the equipment that will be implemented in the long focal length area of  CILEX. The ITFIP team is involved in the coordination of working groups of the European projects  EUPRAXIA (design study) and ARIES. The ITFIP team uses and contributes to the development of the numerical codes WAKE and WARP. Experiments are performed using French (UHI100) and European  (LLC, Lund Sweden) laser facilities. The ITFIP  team also develops tools for numerical modelling of coherent XUV radiation sources in dense rare gases, in support to experiments performed at the Salle-jaune laser facility of LOA.


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TMPDS - Theory and Modeling of Plasma


Fundamental objectives and applications


  - Numerical modeling:
  • Discharges plasmas studied at LPGP: low pressure microwave discharges, DC discharges, and magnetized discharges, created in rare and molecular gases
  • Plasmas created by intense particles beams: neutralizer of negative ions for ITER
  - Objectives : Understanding of the mechanisms involved in plasma creation and species transport:
  • Thin films depositions, captors, ...
  • Magnetic Fusion

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