A5040726475- Plasma Diagnostics and Applications
- Plasma Applications and Diagnostics
- Electrohydrodynamics and Fluid Dynamics
- Gas Dynamics and Kinetic Theory
- Lightning and Electromagnetic Phenomena
- Aerosol Filtration and Electrostatic Precipitation
- Advanced Data Storage Technologies
- Dust and Plasma Wave Phenomena
- Laser-induced spectroscopy and plasma
- Plasma and Flow Control in Aerodynamics
- Ionosphere and magnetosphere dynamics
- Laser Design and Applications
- Particle accelerators and beam dynamics
- Magnetic confinement fusion research
- High voltage insulation and dielectric phenomena
- Electrostatic Discharge in Electronics
- Atomic and Molecular Physics
- Magnetic Field Sensors Techniques
- Computational Fluid Dynamics and Aerodynamics
- Combustion and Detonation Processes
- Combustion and flame dynamics
- Vacuum and Plasma Arcs
- Catalytic Processes in Materials Science
- Metal and Thin Film Mechanics
- Astro and Planetary Science
Laboratoire de Physique des Plasmas
2016-2025
École Polytechnique
2016-2025
Centre National de la Recherche Scientifique
2015-2024
Sorbonne Université
2014-2024
Université Paris 1 Panthéon-Sorbonne
2021-2024
Université Paris-Saclay
2017-2022
Université Paris Sciences et Lettres
2017-2019
Université Paris-Sud
2014-2019
École Centrale Paris
2006-2015
Laboratoire d'Énergétique Moléculaire et Macroscopique, Combustion
2004-2015
This paper presents formulation of computationally efficient models photoionization produced by non-thermal gas discharges in air based on three-group Eddington and improved (SP3) approximations to the radiative transfer equation, effective representation classic integral model for developed Zheleznyak et al (1982) a set three Helmholtz differential equations. The reported formulations represent extensions ideas advanced recently Ségur (2006) Luque (2007), allow fast accurate solution...
Abstract The 2022 Roadmap is the next update in series of Plasma Roadmaps published by Journal Physics D with intent to identify important outstanding challenges field low-temperature plasma (LTP) physics and technology. format same as previous representing visions 41 leading experts 21 countries five continents various sub-fields LTP science In recognition evolution field, several new topics have been introduced or given more prominence. These emphasis highlight increased interests...
Abstract Plasma jets are sources of repetitive and stable ionization waves, meant for applications where they interact with surfaces different characteristics. As such, plasma provide an ideal testbed the study transient reproducible streamer discharge dynamics, particularly in inhomogeneous gaseous mixtures, plasma–surface interactions. This topical review addresses physics their interactions through a pedagogical approach. The state-of-the-art numerical models diagnostic techniques to...
Results of an experimental study the efficiency ignition propane-air mixtures by a high voltage repetitively pulsed nanosecond gas discharge (10 kV, 10 ns, 30 kHz) are presented for pressure range 0.35-2.0 bar. The measured minimal energy is found to decrease with pressure. A significant reduction delay and overall combustion duration were obtained using train high-voltage pulses. Spectroscopic measurements in 1-bar air just after 10-pulse (300 mus) about mJ total show presence N, N <sup...
DOI: 10.2514/1.39034 We study the behavior of excited electronic states atoms in relaxation zone one-dimensional airflows obtained shock-tube facilities. A collisional-radiative model is developed, accounting for thermal nonequilibrium between translational energy mode gas and vibrational individual molecules. The are treated as separate species, allowing non-Boltzmann distributions their populations. Relaxation free-electron also accounted by using a conservation equation. apply to three...
This paper presents a combined 2D numerical and experimental study of the influence admixture on dynamics He– discharge in 10 cm long dielectric tube plasma gun set-up. First, comparison between experiments simulations is carried out ionization front propagation velocity tube. The importance taking into account detailed kinetic scheme for mixture to obtain good agreement with put forward. For μs driven gun, two- three-body Penning reactions occurring column behind front, are shown play key...
This paper provides perspectives on recent progress in the understanding of physics devices where external magnetic field is applied perpendicularly to discharge current. configuration generates a strong electric field, which acts accelerates ions. The many applications this set up include generation thrust for spacecraft propulsion and separation species plasma mass devices. These ExB plasmas are subject plasma-wall interaction effects as well various micro macro instabilities, devices, we...
The increasing need to demonstrate the correctness of computer simulations has highlighted importance benchmarks. We define in this paper a representative simulation case study low-temperature partially-magnetized plasmas. Seven independently developed particle-in-cell codes have simulated benchmark case, with same specified conditions. characteristics used, such as implementation details or computing times and resources, are given. First, we compare at steady-state time-averaged axial...
In this paper we propose a representative simulation test-case of E × B discharges accounting for plasma wall interactions with the presence both electron cyclotron drift instability and modified-two-stream-instability. Seven independently developed particle-in-cell (PIC) codes have simulated benchmark case, same specified conditions. The characteristics different computing times are given. Results show that instabilities were captured in similar fashion good agreement between PIC is...
A nonlinear time-dependent collisional-radiative model for recombining argon is presented. Reactions involving Ar(2)+ are taken into account and their influence discussed. It shown that may increase the time to reach quasi-steady-state by a factor of 100. The calculation recombination rate coefficient at An analytical expression derived compared with existing literature values. importance illustrated comparisons excited levels population densities distribution measured in fast moving plasma...
A nonlinear time-dependent two-temperature collisional-radiative model for air plasma has been developed pressures between 1kPa and atmospheric pressure to be applied the flow conditions of space vehicle re-entry into Earth’s atmosphere. The consists 13 species: N2, O2, N, O, NO, N2+, O2+, N+, O+, NO+, O2−, O− in their ground state major electronic excited states electrons. Many elementary processes are considered given temperatures involved (up 10 000K). Time scales reach final...
An accurate investigation of the behavior electronically excited states atoms and molecules in postshock relaxation zone a trajectory point Flight Investigation ReentryEnvironment 2 (FIRE II) flight experiment is carried out bymeans one-dimensional flow solver coupled to collisional-radiativemodel. Themodel accounts for thermal nonequilibrium between translational energy mode gas vibrational individualmolecules. Furthermore, electronic andmolecules are treated as separate species, allowing...
This paper presents 2D simulations of the dynamics formation a nanosecond spark discharge between two point electrodes in air at atmospheric pressure 300 and 1000 K, induced heating following hydrodynamic expansion. As first step, we have considered that 30% energy instantaneously heats ambient air. At end voltage pulse, it is shown density temperature distributions are non-uniform interelectrode gap. Rapidly after cylindrical shock wave formed propagates with velocity very close to speed...
In this work we study the electron drift instability in Hall-effect thrusters (HETs) using a 2D electrostatic particle-in-cell (PIC) simulation. The simulation is configured with Cartesian coordinate system modeling radial-azimuthal () plane for large radius thrusters. A magnetic field, , aligned along Oy axis (r direction), constant applied electric Oz (perpendicular to plane), and direction Ox (θ direction). Although transport can be well described by electron–neutral collisions low plasma...
Numerical simulations and experiments are performed to better understand the interaction between a pulsed helium plasma jet dielectric target. The focus of this work lies on volume surface charge influence electric field distribution. Experimentally, due charges is measured inside an electro-optic target under exposure jet, using optical technique called Mueller polarimetry. For first time, time-resolved spatial distributions both axial radial components obtained simultaneously. A 2D fluid...
Coordinated ground‐based observations of Titan were performed around or during the Huygens atmospheric probe mission at on 14 January 2005, connecting momentary in situ by with synoptic coverage provided continuing programs. These consisted three different categories: (1) radio telescope tracking signal 2040 MHz, (2) atmosphere and surface Titan, (3) attempts to observe radiation emitted Probe entry into Titan's atmosphere. The was successfully acquired a network terrestrial telescopes,...
In the simulation of streamer discharge propagation, classical integral methods used to calculate photoionization source term are computationally very expensive. this work, a new approach based on direct solution an approximate radiative transfer equation is developed. Different approximations discussed and tested for typical conditions encountered in discharges. An improved Eddington approximation shown be accurate Gaussian emission with half-width length order 0.02 cm when absorption...
The electric field in streamer discharges air can be easily determined by the ratio of luminous intensities emitted N2(C 3Πu) and if steady-state assumption emitting states is fully justified. At ground pressure, condition not fulfilled it demonstrated that its direct use to determine local instantaneous peak head may overestimate this a factor 2. However, when spatial time-integrated optical emissions (OEs) are considered, reported results show possible formulate correction framework...
This paper presents simulations of an air plasma discharge at atmospheric pressure initiated by a needle anode set inside dielectric capillary tube. We have studied the influence tube inner radius and its relative permittivity ε r on structure dynamics. As reference, we used = 1 to study only cylindrical constraint discharge. For 100 µm 1, shown that fills during propagation is rather homogeneous behind front. When in range 300–600 µm, tubular with peak values electric field electron density...
Both experimental and theoretical analysis of an {ultra-short} phenomena occurring during the positive streamer propagation in atmospheric pressure air is presented. {With tens-of-picoseconds tens-of-microns precision, it shown that when head passes a spatial coordinate, emission maxima from N$_2$ N$_2^+$ radiative states follow with different delays. These delays are caused by differences dynamics populating states, due to excitation quenching rates.} {Associating position maximum value...
This work investigates the dynamical charging of a surface under exposure non-equilibrium plasma jet at atmospheric pressure through quantitative comparison between modeling and experiments. We show using mono-polar pulses with variable pulse duration amplitude that time (i.e. from impact ionization wave till fall high voltage pulse) is crucial element determining plasma-surface interaction. done direct measurements electric field induced inside target optical diagnostic technique called...