A5065512485- Plasma Applications and Diagnostics
- Plasma Diagnostics and Applications
- Electrohydrodynamics and Fluid Dynamics
- High voltage insulation and dielectric phenomena
- Aerosol Filtration and Electrostatic Precipitation
- Vacuum and Plasma Arcs
- Power Transformer Diagnostics and Insulation
- Catalytic Processes in Materials Science
- Electrostatic Discharge in Electronics
- Laser Design and Applications
- Gas Sensing Nanomaterials and Sensors
- Nuclear Physics and Applications
- Nuclear reactor physics and engineering
- Radiation Detection and Scintillator Technologies
- Surface Modification and Superhydrophobicity
- Electric Motor Design and Analysis
- Microbial Inactivation Methods
- Lightning and Electromagnetic Phenomena
- Recycling and Waste Management Techniques
- Photocathodes and Microchannel Plates
- Electromagnetic Compatibility and Noise Suppression
- Air Quality Monitoring and Forecasting
- Enterobacteriaceae and Cronobacter Research
- Scientific Measurement and Uncertainty Evaluation
- Diamond and Carbon-based Materials Research
Laboratoire de Génie Électrique et Électronique de Paris
2014-2024
CentraleSupélec
2015-2024
Sorbonne Université
2015-2024
Centre National de la Recherche Scientifique
1998-2024
Université Paris-Saclay
2015-2024
Université Paris-Sud
2002-2018
Supélec
2006-2015
Laboratoire de Physique des Gaz et des Plasmas
1998-2011
Laboratoire de Physique des Plasmas
2002
A flowing afterglow of very pure molecular nitrogen at atmospheric pressure with admixture controlled amounts (from some tens to thousands ppm) oxygen is studied. For flows 40 slm, spectroscopic measurements down the discharge allow us estimate concentrations in atomic and singlet-S metastable atoms. With UV emission due oxide, all three reactive agents exhibit sporicidal effects, their relative role estimated.
Since the signature of ITER treaty in 2006, a new research programme targeting emergence generation neutral beam (NB) system for future fusion reactor (DEMO Tokamak) has been underway between several laboratories Europe. The specifications required to operate NB on DEMO are very demanding: provide plasma heating, current drive and control at high level power (up 150 MW) energy (1 or 2 MeV), including performances term wall-plug efficiency (η > 60%), availability reliability. To this aim,...
The transportation industry (automobile, aerospace) is undergoing a significant shift towards higher voltage supply, to increase embedded power. Increasing the can lead an in occurrence of partial discharges which have deleterious impact on insulators, and therefore system lifetime. current study investigates two electric drives architecture, namely first combination conventional motor with single inverter and, second, multi-Three-Phase machine based highly coupled windings combined...
The work presented in this paper deals with the influence of pulse width modulation (PWM) power supply parameters on partial discharge inception voltage (PDIV). For a given system supplied using PWM, behavior discharges may be different from classical AC or DC configuration. An experimental study was conducted order to observe changes PDIV levels respect PWM such as duty cycle, switching frequency and rise time. Measurements were done simple twisted pair enameled wires, placed inside...
Abstract A nitrogen afterglow at atmospheric pressure has recently been described as able to transport active species over long distances in small diameter tubes, with a biocidal effect. For discharge gas composed of nitrogen, either high purity or some controlled ppm oxygen, survival curves are presented. The afterglow, flowing 40 slm cylindrical quartz tube 8 mm internal is studied using emission spectroscopy. Fundamental excited states atomic molecular parent gases detected and evaluated....
Dielectric barrier discharges (DBDs) are commonly used for gas effluent cleanup and ozone generation. For these applications, the energy efficiency of discharge is a major concern. This paper reports on investigations carried out voltage shape applied to DBD reactor electrodes, aiming evaluate possible improvement production. Two geometries were used: pin-to-pin cylinder-to-cylinder, both driven either by bi-directional power supply (voltage rise rate 1 kV/μs) or pulsed kV/ns). Ozone formed...
Paschen's law gives the inception voltage for an electrical discharge as a function of product gas pressure and gap distance between two infinite planar electrodes. It is known that deviations from occur when temperature increased. Historically, theoretical corrections, Peek Dumbar are proposed to predict deviation by increasing temperature. To carry out experimental investigation on temperature, customized system was designed, which can operate at temperatures up 400 °C 1 MPa, calculated...
Abstract Hydrogen peroxide production was studied in an atmospheric pressure dielectric barrier discharge device. The atmosphere argon/oxygen gas mixture of variable ratio with water vapor adjunction; H
The work presented here is part of a larger study concerning the analysis electrical stress and degradation phenomena insulation low voltage machines fed by Pulse Width Modulation (PWM) controlled inverter. goal to assess risk partial discharge (PD) in stator windings rotating machines. In this objective, two complementary approaches are adopted: electrostatic simulations using Finite Element Method (FEM) 2D approximation, experimental measurements. model seems be good tool allowing an...
Field emission current from surfaces under vacuum and at high field strengths can be reduced by the injection of gas into evacuated volume. In this paper, effects ${\mathrm{H}}_{2}$, He, ${\mathrm{N}}_{2}$, Ar on ``dark'' emitted a tungsten carbide point cathode for 2 cm gap distance is studied. Exposure to any these gases pressures order ${10}^{\ensuremath{-}3}--{10}^{\ensuremath{-}2}\text{ }\mathrm{Pa}$ was found reduce up 90% with time constant $\ensuremath{\sim}1\text{ }\text{...
We report on an experimental study of the temporal evolution OH density and gas temperature in spark discharges created by nanosecond repetitively pulsed pure water vapour at 475 K atmospheric pressure. The plasma was generated 20 kV, ns pulses, a repetition frequency 10 kHz. measured during discharge optical emission spectroscopy second positive system N2, between two two-colour OH-planar laser induced fluorescence (OH-PLIF) using pairs rotational transitions. Between successive discharges,...
In numerous industrial and electrical applications, within the zone near junction between a metal conductor, solid insulator surrounding gas, here called triple junction, local electric field created by potential of conductor may be enhanced due to difference in relative permittivity gas.This enhancement facilitate formation partial discharges (PD).Partial discharge activity can cause low-level damage as well an accelerated aging which weakens insulation system then lead long term complete...
Pulsed corona discharges propagated in argon (or with added water vapor) at atmospheric pressure on the interior surface of a 49 cm long quartz tube were investigated for application bio-decontamination. H2O molecule dissociation plasma generated reactive species (i.e. OH ground and excited states) UV emission, which both directly affected bacterial cells. In order to facilitate evaluation contribution radiation, DNA damage repair defective strain, Escherichia coli DH-1, was used. Discharge...
The effect of stainless steel cathode surface morphology on field electronic emission in high vacuum (~10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-5</sup> Pa) is studied. rugosity shown to affect the intensity; high-aspect ratio features lead locally enhanced electric field, thereby increasing emission. A breakdown vacuum, caused either by impact charged dust particles or other impurities, overheating and vaporization emitters, can...
The neutron flux monitoring system of the French GEN-IV sodium-cooled fast reactor will rely on high-temperature fission chambers installed in vessel and capable operating over a wide-range flux. definition such is presented technological solutions are justified with use simulation experimental results.
Nanosecond Repetitively Pulsed (NRP) discharges in atmospheric pressure water vapor at 450 K are studied with time-resolved optical emission spectroscopy (OES). A 20-ns highvoltage pulse is applied across two pin-shaped electrodes a frequency of 10 kHz, an energy 2 mJ per pulse. Emission OH(A-X) as well atomic states O and H observed. The these species increases during the pulse, then decreases. Then, after about 150 ns, we observe again strong increase species. To determine gas temperature,...
According to an estimation of the French Health Ministry dating back 1994, every year in France, about 1.5 % population entering hospital for medical care (i.e. ~ 10 000 persons / year) are submitted infectious agents bringing them a fatal issue. This number is more or less same as per victims on roads. Ibis shows how crucial needs efficient sterilization technologies any object, which may be put personal contact with patients. The objects concerned can very different types, including...
Iatrogenic infections due to contaminated medical devices are significant problem in the field of medicine, and have motivated search for alternative surface disinfection/sterilization methods technologies. During last decade, a strong effort has been made non-thermal plasmas, including fundamental work from physical, but also biological point view. Non-thermal plasmas used industry modification properties such as improve wettability adherence, deposition thin films. The present considers...
During the operation of Superphenix and Phenix reactors, an aberrant electrical signal was detected from fission chambers used for neutron flux monitoring. This signal, thought to be due partial discharge (PD) is similar resulting interactions, generated in at temperatures above 400 °C. paper reports work on characterization localization source this a High Temperature Fission Chamber (HTFC). The relation between shape PD various parameters (nature pressure chamber filling gas, electrode gap...