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4 results on '"Delage, Théo"'

1. Reflectionless Plasma Ignition via High-Power Virtual Perfect Absorption

Author

Delage, Théo, Sokoloff, Jérôme, Pascal, Olivier, Mazières, Valentin, Krasnok, Alex, and Callegari, Thierry

Subjects
Physics - Plasma Physics, Physics - Applied Physics, Physics - Optics
Abstract

Plasma ignition is critical in various scientific and industrial applications, demanding an efficient and robust execution mechanism. In this work, we present an innovative approach to plasma ignition by incorporating the analysis of fundamental aspects of light scattering in the complex frequency plane. For the first time, we demonstrate the high-power virtual perfect absorption (VPA) regime, a groundbreaking method for perfectly capturing light within a resonator. By carefully designing the temporal profile of the incident wave, we effectively minimize reflections during the ignition stages, thereby significantly enhancing the efficiency and resilience of the process. Through comprehensive experimental investigations, we validate the viability of this approach, establishing VPA as a powerful tool for reflectionless excitation and optimal control of plasma discharge. By addressing the limitations of conventional plasma ignition methods, this research represents a pivotal step towards transformative advancements in plasma technology, with promising implications for improving the performance and sustainability of numerous applications.

Published
2023

2. Experimental demonstration of virtual critical coupling to a single-mode microwave cavity.

Author

Delage, Théo, Pascal, Olivier, Sokoloff, Jérôme, and Mazières, Valentin

Subjects
*CAVITY resonators, *COMMODITY futures, *AMPLITUDE modulation, *PLASMA materials processing, *MICROWAVE plasmas
Abstract

We present an experimental realization of virtual critical coupling in microwave, i.e., virtual perfect absorption of an incident wave by a resonant cavity, through transient time modulation of its amplitude. The design of a waveform matched to the ignition process of a plasma, characterized in a simplified way by two operating modes over time (plasma off/plasma on), motivates this first step in practical realization of virtual critical coupling in microwaves. We propose a time domain method for extracting necessary parameters for realization of virtual critical coupling, especially the complex frequency called zero of the S-matrix. To this end, we start from the experimental characterization of a single-mode and single-access microwave cavity including metal protrusions for future plasma ignition. Then, the method relies on the analysis of harmonic response of the overcoupled cavity during three time periods: the transient under excitation, the steady state under excitation, and the transient after excitation cutoff. Finally, an experimental demonstration of virtual critical coupling is performed. [ABSTRACT FROM AUTHOR]

Published
2022
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4. Design of a Tunable Subwavelength Plasma-Based Resonator for Electrically Small Antenna Applications in L-band

Author

Laffont, Adrien, Delage, Théo, Pascaud, Romain, Grzeskowiak, Marjorie, Cailhol, Cyril, Callegari, Thierry, Liard, Laurent, Pascal, Olivier, Adam, Jean-Pierre, Département Electronique, Optronique et Signal (DEOS), Institut Supérieur de l'Aéronautique et de l'Espace (ISAE-SUPAERO), GRAMAT (DAM/GRAMAT), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), LAboratoire PLasma et Conversion d'Energie (LAPLACE), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT), Groupe de Recherche Energétique, Plasmas et Hors Equilibre (LAPLACE-GREPHE), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Groupe de Recherche en Electromagnétisme (LAPLACE-GRE), Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Commissariat à l'Energie Atomique et aux énergies alternatives - CEA (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE), and Université Toulouse III - Paul Sabatier - UT3 (FRANCE)

Subjects
Plasma, Traitement du signal et de l'image, Antennas, Electrically small antennas, Epsilon negative material, Localized surface plasmon resonance, Plasma devices, [SPI.SIGNAL]Engineering Sciences [physics]/Signal and Image processing
Abstract

International audience; A preliminary study of the design of an electrically small plasma-based resonator using a localized surface plasmon resonance (LSPR) above 1 GHz is presented. Such a resonator is intended to be used to develop an electrically small antenna with frequency agility. This resonator consists of a plasma discharge confined in a hemispherical glass shell 3 cm in diameter on a ground plane. From 1 to 1.5 GHz, the plasma electron density required to achieve the LSPR must be between 0.5 × 1011 and 1.4×1011 cm−3. Plasma losses are taken into account in this study and provide information on the required gas pressure. Typically for neon gas, the working pressure must be around 50 mTorr. A practical implementation using a miniature inductively coupled plasma (mICP) source is finally discussed.

Published
2020
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