A5010745666- Electromagnetic Scattering and Analysis
- Astro and Planetary Science
- Magnetic confinement fusion research
- Electromagnetic Simulation and Numerical Methods
- Particle accelerators and beam dynamics
- Planetary Science and Exploration
- Superconducting Materials and Applications
- Electromagnetic Compatibility and Measurements
- Fusion materials and technologies
- Advanced Antenna and Metasurface Technologies
- Numerical methods in inverse problems
- Spacecraft and Cryogenic Technologies
- Astrophysics and Star Formation Studies
- Atmospheric Ozone and Climate
- Gyrotron and Vacuum Electronics Research
- Plasma Diagnostics and Applications
- Microwave Imaging and Scattering Analysis
- Space Exploration and Technology
- Electromagnetic Launch and Propulsion Technology
- Microwave and Dielectric Measurement Techniques
- Isotope Analysis in Ecology
- Advanced Mathematical Modeling in Engineering
- Geomagnetism and Paleomagnetism Studies
- Stellar, planetary, and galactic studies
- Ionosphere and magnetosphere dynamics
Inserm
2024-2025
Université de Limoges
2024-2025
Centre National de la Recherche Scientifique
1891-2024
Center for MathematicaL studies and their Applications
1995-2024
École Normale Supérieure Paris-Saclay
2010-2024
Centre Giovanni Borelli
2024
CEA Cadarache
2013-2023
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2013-2023
Institut de Recherche sur la Fusion par Confinement Magnétique
2015-2022
CEA DAM Île-de-France
2008-2020
Abstract As part of ITPA-Integrated Operational Scenario activities, this contribution reviews recent experimental characterizations radio-frequency (RF)-induced scrape-off layer (SOL) modifications various tokamaks worldwide and the LArge Plasma Device at UCLA. The phenomenology, as observed using a large variety measurement techniques, is consistent with expectations from RF sheath rectification. Emphasis then put on complex three-dimensional (3D) spatial patterns RF–SOL interaction, in...
En 2007, pour être franc, je ne pensais pas ou plutôt plus « faire » une thèse comme on dit.J'étais alors assistant ingénieur au CNRS ; très impliqué dans des projets de recherche mon unité bien chercheurs extérieurs.Mon poste, attaché service d'un instrument national l'Institut sciences l'univers (INSU) me permettant varier les thèmes et interactions avec collègues, était reste encore source motivations renouvelées.C'est ce contexte qu'ont débuté ces 5 années travail ma thèse.Mais sont...
Three identical new WEST Ion Cyclotron Resonance Heating (ICRH) antennas have been designed, assembled then commissioned on plasma from 2013 to 2019.The ICRH system is both load-resilient and compatible with long-pulse operations.The three successfully operated together in 2019 2020.The load resilience capability has demonstrated the antenna feedback controls for phase matching developed.The breakdown detection systems validated protected antennas.The use of combination Lower Hybrid...
Abstract The mission of WEST (tungsten-W Environment in Steady-state Tokamak) is to explore long pulse operation a full tungsten (W) environment for preparing next-step fusion devices (ITER and DEMO) with focus on testing the ITER actively cooled W divertor tokamak conditions. Following successful completion phase 1 (2016-2021), 2 started December 2022 lower made entirely ITER-grade mono-blocks. A boronization prior first plasma attempt allowed smooth startup new divertor. Despite reduced...
An original mathematical approach for the diffraction of an electromagnetic skew-incident wave by a wedge allows us to reduce such problem new elementary functional equations. Using this method, we present exact analytical solution with closed form expressions class any angle certain type anisotropic boundary condition which does not require field component vanish on faces. We thereby consider important case where principal axes anisotropy are along and normal edge, relative impedance matrix...
After the discovery of CO, CO2, and more recently H2O in Titan's atmosphere, chemistry oxygenated organic compounds this environment has been limited to theoretical studies only. Both kinetic thermochemical models predict formation methanol formaldehyde as main O-organic products. Here we show that oxirane (also named ethylene oxide) is product experiments designed simulate upper atmosphere Titan; are not produced detectable amounts. Oxirane previously detected interstellar medium hot...
Abstract High power experiments, up to 9.2 MW with LHCD and ICRH, have been carried out in the full tungsten tokamak WEST. Quasi non inductive discharges achieved allowing extend plasma duration 53 s stationary conditions particular respect contamination. Transitions H mode are observed, H-modes lasting 4 obtained. The increase stored energy is weak since crossing separatrix close L–H threshold. Hot L plasmas (central temperature exceeding 3 keV) a confinement time following ITER L96 scaling...
The problem of the diffraction an electromagnetic plane wave by a convex cone arbitrary smooth cross‐section with impedance (Leontovich) boundary conditions is studied. vector reduced to that for Debye potentials. By means Kontorovich–Lebedev integrals, two spectral functions are introduced and corresponding value formulated. potentials found satisfy Helmholtz equations on unit sphere be coupled through non‐traditional type shifts variable. use Green theorem permits us establish integral...
We study a new spectral approach for scattering by two-dimensional polygonal objects with arbitrary surface impedance conditions. In this delicate exterior problem, the Wiener–Hopf method cannot be applied, while asymptotic methods can only used if corners are widely spaced compared to wavelength. A based on Sommerfeld–Maliuzhinets integral representation is presented reduce problem simple equations in complex plane. For this, we use an expression of function, where isolate contribution any...
The paper reports on latest developments for the ITER Ion Cyclotron Heating and Current Drive system: imminent acceptance tests of a prototype power supply at full power; successful factory candidate RF amplifier tubes which will be tested dedicated facilities; further design integration experimental validation transmission line components under 6MW hour-long pulses. antenna Faraday shield thermal has been validated above requirements by cyclic high heat flux tests. R&D ceramic brazing is...
An analytical-numerical computation of diffraction coefficients is described for a semi-infinite impedance cone circular cross section illuminated by an electromagnetic plane wave. To enable incomplete separation variables, both the incident and scattered fields are expressed in terms Kontorovich-Lebedev (KL) integrals; inversion Leontovich condition on cone's surface yields equations spectra, whose Fourier satisfy certain functional difference second order; latter then converted to integral...
Recent fundamental results concerning the ultimate performance of electromagnetic absorbers were adapted and extrapolated to field sound waves. It was possible deduce some appropriate figures merit indicating whether a particular structure close best matching properties. These had simple expressions easy compute in practical cases. Numerical examples illustrated that conventional state-of-the-art structures an overall efficiency approximately 50% limit. However, if bandwidth at −6 dB...