In this doctoral thesis work, experimental and theoretical studies are carried out on the decomposition characteristics of C5F10O/N2/O2 gas mixture at the gas-solid interface of metal materials and under the discharge and thermal action, and the feasibility and safety of its application are evaluated in combination with the biosafety of C5F10O gas ...
This thesis provides an analysis of the optical emission of Hall Effect thrusters. The study is grounded in the context of the dynamic field of micro reusable launchers and ride-share satellite programs, which have substantially reduced space operation costs. This shift has intensified the demand for standardized and miniaturized satellite equipmen...
Les applications des décharges d'arcs impulsionnelles dans l'eau sont nombreuses : fracturation de roches, formage électrohydraulique de pièces métalliques ou encore traitement de l'eau. Ces applications de puissances pulsées requièrent, pour beaucoup, des ondes de pression intenses avec un dépôt d'énergie sur des temps inférieurs à la milliseconde...
Turbulence is a nonlinear process of cross-scale energy transfer in a fluid. The solar wind is an example of a turbulent plasma available for investigation owing to in-situ spacecraft measurements. Solar wind fluctuations are highly irregular and chaotic. Above an incoherent background fluctuations high-amplitude coherent structures, localized in s...
The unstable electromagnetic fields growing during the propagation of beams of relativistic charged particles in a plasma play a major role in extreme astrophysical scenarios such as gamma-ray bursts, active galactic nuclei or pulsars, in which they are the main source of dissipation of the relativistic ejecta. Beam-plasma instabilities are also ub...
International audience
Published in Nuclear Fusion
Boron (B) powder injection is a potential alternative to glow discharge boronization as a wall conditioning method for tokamaks. This technique is currently being studied in WEST experiments, during which B powder is injected by an Impurity Powder Dropper developed by PPPL. In order to interpret and analyse experimental trends, and to help develop ...
Dusty plasmas are electrically quasi-neutral media that, along with electrons, ions, neutral gas, radiation, and electric and/or magnetic fields, also contain solid or liquid particles with sizes ranging from a few nanometers to a few micrometers. These media can be found in many natural environments as well as in various laboratory setups and indu...
Negative ion production by volumetric processes is investigated in the RAID linear device using experiments and modeling. Measurements by optical emission spectroscopy, cavity ring-down spectroscopy, and Langmuir probe assisted laser photodetachment are combined and reveal that H$^−$ and D$^−$ ions are distributed in a halo around the plasma column...
This paper focuses on the use of an electro-optic (EO) probe for the spatially and temporally resolved characterization of the electric field (E-field) associated with guided ionization waves-or guided streamers-propagating at atmospheric pressure. An AC high-voltage power supply (6 kV at 18 kHz) is used to generate guided ionization waves in heliu...
