A5012456301- Plasma Diagnostics and Applications
- Plasma Applications and Diagnostics
- Laser-induced spectroscopy and plasma
- Atomic and Molecular Physics
- Dust and Plasma Wave Phenomena
- Meteorological Phenomena and Simulations
- Mass Spectrometry Techniques and Applications
- Particle accelerators and beam dynamics
- Gas Sensing Nanomaterials and Sensors
- Climate variability and models
- Spectroscopy and Laser Applications
- Catalytic Processes in Materials Science
- Laser Design and Applications
- Surface Modification and Superhydrophobicity
- Analytical chemistry methods development
- Cryospheric studies and observations
- Gyrotron and Vacuum Electronics Research
- Analytical Chemistry and Sensors
- Geophysics and Gravity Measurements
- Electrohydrodynamics and Fluid Dynamics
- Precipitation Measurement and Analysis
- Metal and Thin Film Mechanics
- Catalysts for Methane Reforming
- Ionosphere and magnetosphere dynamics
- Atmospheric Ozone and Climate
Institut National de la Recherche Scientifique
2022-2023
Max Planck Institute for Plasma Physics
2017-2022
Centre National de la Recherche Scientifique
2014-2021
Université de Toulouse
2021
Laboratoire Plasma et Conversion d'Energie
2021
Institut National Polytechnique de Toulouse
2021
Université Toulouse III - Paul Sabatier
2021
Max Planck Society
2017-2020
Ruhr University Bochum
2015-2018
Eindhoven University of Technology
2011-2016
LXCat is an open‐access platform ( www.lxcat.net ) for curating data needed modeling the electron and ion components of technological plasmas. The types presently supported on are scattering cross sections swarm/transport parameters, ion‐neutral interaction potentials, optical oscillator strengths. Twenty‐four databases contributed by different groups around world can be accessed LXCat. New contributors welcome; database retain ownership responsible contents maintenance individual databases....
Laser scattering provides a very direct method for measuring the local densities and temperatures inside plasma. We present new experimental results of laser on an argon atmospheric pressure microwave plasma jet operating in air environment. The is small so high spatial resolution required to study effect penetration molecules into signal has three overlapping contributions: Rayleigh from heavy particles, Thomson free electrons Raman molecules. filtered out optically with triple grating...
Technologies based on non-equilibrium, low-temperature plasmas are ubiquitous in today’s society. Plasma modeling plays an essential role their understanding, development and optimization. An accurate description of electron ion collisions with neutrals transport is required to correctly describe plasma properties as a function external parameters. LXCat open-access, web-based platform for storing, exchanging manipulating data needed the components plasmas. The types supported by electron-...
In this paper, we review the main challenges related to laser Thomson scattering on low temperature plasmas. The features of triple grating spectrometer used discriminate and Raman signals from Rayleigh stray light are presented. parameters influencing detection limit reviewed. Laser plasma emission two limiting factors, but molecules inside will further decrease it.
Abstract The optical emission spectra of high pressure CO 2 microwave plasmas are usually dominated by the C Swan bands. In this paper, use bands for estimating gas temperature in is assessed. State state fitting employed to check correctness assuming a Boltzmann distribution rotational and vibrational functions and, within statistical systematic uncertainties, band can be fitted accurately with single levels. processes leading production molecule particularly its <?CDATA...
Microwave plasmas are a promising technology for energy-efficient CO$_{2}$ valorization via conversion of into CO and O$_2$ using renewable energies. A 2.45 GHz microwave plasma torch with swirling gas flow is studied in large pressure (60-1000~mbar) (5-100~slm) range. Two different modes the torch, depending on operating input power, described: at pressures below 120~mbar fills most volume whereas about an abrupt contraction center resonator observed along increase temperature from 3000~K...
Abstract Radial electron density n e ( r ) and temperature T profiles of a microwave argon plasma at intermediate pressure were investigated by Thomson scattering. This method allows one to get spatially resolved without any priori assumption on the shape profile. Data acquired in range 5–88 mbar where transition from wall-stabilized radially contracted mode was observed. It found that fitting radial profile can be done with Bessel function for which boundary radius R defined = 0 is free...
In this paper, a detailed investigation of the spatio-temporal dynamics pulsed microwave plasma is presented. The ignited inside dielectric tube in repetitively regime at pressures ranging from 1 up to 100 mbar with pulse repetition frequencies 200 Hz 500 kHz. Various diagnostic techniques are employed obtain main parameters both spatially and high temporal resolution. Thomson scattering used electron density mean energy fixed positions tube. evolution two resonant metastable argon 4s states...
A novel electromagnetic (EM) model was developed using the Plasimo platform with aim to study different microwave induced plasmas. In this study, EM is coupled fluid non-local-thermal-equilibrium (non-LTE) description of a discharge (flow, temperatures and species densities), it allows construction 2D self-consistent multiphysics for
This work presents the results of Thomson scattering measurements, optical emission spectroscopy and laser absorption applied to a high pressure nanosecond pulsed helium micro-discharge. All data are recorded with temporal resolution, giving an insight into processes determining discharge dynamics. From electron velocity distribution function is determined. Photo-ionization Rydberg molecules complication for direct measurement density by scattering. Laser pulse energy variation measurements...
Abstract In this work, a long surface wave plasma column is generated using high power pulse-modulated microwave in argon at atmospheric pressure. The temporal evolutions of the electron density and temperature are diagnosed by optical emission spectroscopy. It found that intensity peaks correspond to nodes standing waves where local electric field reduced, rather than antinodes, which contrast with low pressure discharges. reasons for behavior discussed considering excitation balance...
Abstract The electron temperature of an argon surface wave discharge generated by a surfatron plasma at intermediate pressures is measured optical emission spectroscopy (OES) and Thomson scattering (TS). OES method, namely absolute line intensity (ALI) measurements gives which found to be (more or less) constant along the column. TS, on other hand, shows different behaviour; not but rises in direction propagation. In pressure range this study, it theoretically known that deviations from...
This study presents the absolute argon 1 s (in Paschens’s notation) densities and gas temperature, Tg, obtained in a surfatron plasma pressure range 0.65&lt;p&lt;100 mbar. The absorption signals of 772.38, 772.42, 810.37, 811.53 nm lines, absorbed by atoms 1s3, 1s4, 1s5 states, were recorded with two tunable diode lasers. Tg is deduced from line shapes when scanning laser wavelengths. profile, which Doppler broadening dominated Gaussian at pressures p&lt;10 mbar, changes to Voigt...
The effect of the pulse repetition rate (PRR) on generation high energy electrons in a fast ionization wave (FIW) discharge is investigated by both experiment and modelling. FIW driven nanosecond voltage pulses generated helium with pressure 30 mbar. axial electric field (E z ), as force electron generation, strongly influenced PRR. Both measurement model show that, during breakdown, peak value E decreases PRR, while after increases distribution function (EEDF) calculated similar to Boeuf...
In this paper, we discuss the experimental results presented in Schregel et al (2016 Plasma Sources Sci. Technol. 25 054003) on a high pressure micro-discharge operated helium and driven by nanosecond voltage pulses. A simple global plasma chemistry model is developed to describe ions, excited atomic molecular species dynamics ignition early afterglow regimes. The existing data kinetics reviewed critically discussed. It highlighted that several inconsistencies branching ratio of neutral...
A criterion is given for the laser fluency (in J/m2) such that, when satisfied, disturbance of plasma by avoided. This accounts heating electron gas intermediated electron-ion (ei) and electron-atom (ea) interactions. The first mechanism well known was extensively dealt with in past. second often overlooked but importance plasmas low degree ionization. It especially important cold atmospheric plasmas, that nowadays stand focus attention. new criterion, based on concerted action both ei ea...
Abstract An experimental investigation of the dissociation CO 2 in a symmetric pin-to-pin dielectric barrier discharge (DBD) is presented. The reactor geometry allows for an accurate control number filaments (microdischarges) and used to study impact one single filament on dissociation. We show per half cycle follows power-law as function injected power does not depend pressure, flow or other process parameters. It shown that pressures between 200 700 mbar approximately 0.5 W required charge...
Abstract An experimental investigation of the surface modification polytetrafluoroethylene (PTFE) by an Ar and Ar/O 2 plasma created with atmospheric‐pressure radio frequency (r.f.) torch is presented here. The surfaces were analyzed atomic force microscopy (AFM), XPS water contact angle (WCA) to get insight morphology chemistry. increase roughness observed treatment. WCA analysis shows that these are more hydrophobic than pristine PTFE; a 135° was measured. When PTFE treated plasma, no...
An inductively coupled radio-frequency plasma in chlorine is investigated via a global (volume-averaged) model, both continuous and square wave modulated power input modes. After the switched off (in pulsed mode) an ion–ion appears. In order to model this phenomenon, novel quasi-neutrality implementation proposed. Several distinct Cl wall recombination probability measurements exist literature, their effect on simulation data compared. We also of gas temperature that was imposed over range...
Abstract A squared-wave power pulsed low-pressure plasma is investigated by means of Thomson scattering. By this method the values electron density and temperature are obtained, directly. The created a surfatron launcher in pure argon at gas pressures 8–70 mbar. Features pulse rise decay studied with microsecond time resolution. During we observe initial high values, while still rising. At switch-off find times that smaller than what expected on basis diffusion losses. This implies dominant...
Among the pool of Power-to-X technologies, plasmas show high potential for efficient use intermittent renewable energies. High efficiencies CO2 conversion have been reported while using microwave at vacuum conditions which are, however, not suitable mitigation industrial scales. Here we that ultrafast pulsation microwaves allow significant improvements energy during splitting atmospheric pressure as compared to continuous wave operation source. Moreover, by interrogation plasma with...
In this communication, we investigate the ignition of pulsed microwave plasmas in a narrow dielectric tube with an electrodeless configuration. The plasma is generated using surfatron cavity. power modulated as square wave rise-time 30 ns at variable frequencies from 100 Hz up to 5 MHz. and propagation inside 3 mm radius quartz are imaged spatially resolved nanosecond time resolution iCCD camera.
Inductively-coupled plasmas in pure O2 (at pressures of 5–80 mTorr and radiofrequency power up to 500 W) were studied by optical absorption spectroscopy over the spectral range 200–450 nm, showing presence highly vibrationally excited molecules (up vʺ = 18) Schumann–Runge band absorption. Analysis relative intensities indicates a vibrational temperature 10,000 K, but these hot only represent fraction total density. By analysing (11-0) at higher resolution rotational was also determined,...