Yanis Agha

Electrohydrodynamic coupling and stochastic branching in a miniaturized ns-pulsed He plasma jet

Yanis Agha, Konstantinos Giotis, Dimitris Stefas, Nicolas Fagnon et autres

This study focuses on the complex coupling between discharge and flow properties in a ns-pulsed He micrometer scale atmospheric pressure plasma jet (μAPPJ). This is investigated by integrating electrical measurements, schlieren photography, ICCD imaging, and space-resolved Optical Emission Spectroscopy (OES) with Computational …

Ultrafast ps–TALIF and streak camera diagnostics of atomic hydrogen in a helium microplasma jet

Dimitrios Stefas, Yanis Agha, Laurent Invernizzi, J. Santos Sousa et autres

Abstract Picosecond two-photon absorption laser induced fluorescence (ps–TALIF) is combined with a streak camera (∼1 ps highest temporal resolution) to probe the effective lifetime ( τ eff H ( n = 3 ) ) and absolute density ( N H ) of …

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Discharge dynamics in a cylindrical SDBD prototype reactor under ns-pulsed and sinusoidal AC operation

Konstantinos Giotis, Dimitrios Stefas, Yanis Agha, Hans Höft et autres

We developed a prototype reactor generating surface dielectric barrier discharges (SDBDs) in ambient air, designed for reliable operation while preventing constructive material degradation. It features stainless steel electrodes and quartz dielectric, both detachable to facilitate reproducible fabrication. The grounded electrode is fully …

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Ultrafast ps--TALIF and streak camera diagnostics of atomic hydrogen in a helium microplasma jet

Dimitrios Stefas, Yanis Agha, Laurent Invernizzi, J. Santos Sousa et autres

Picosecond two-photon absorption laser induced fluorescence (ps--TALIF) is combined with a streak camera ($\sim$1 ps highest temporal resolution) to probe the effective lifetime ($τ_{eff_{H(n=3)}}$) and absolute density ($N_H$) of atomic hydrogen in the effluent of a helium atmospheric-pressure microplasma jet ($μ$APPJ). This …

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Gas temperature measurements from ps-TALIF in highly collisional plasmas

Abdoulaye Siby, Dimitrios Stefas, Yanis Agha, Laurent Invernizzi et autres

In this work, we present a straightforward approach to retrieve gas temperatures directly from the effective lifetime τH of the ps-laser excited species measured with picosecond Two Photon Absorption Laser Induced Fluorescence (ps-TALIF). This approach allows for simultaneous measurements of absolute atom …

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Investigation of picosecond laser pulse properties using a streak camera and their utilization for TALIF studies in a microwave plasma torch

Dimitrios Stefas, Abdoulaye Siby, Yanis Agha, Laurent Invernizzi et autres

The intrinsic properties of picosecond (ps) laser pulses with different wavelengths are investigated using a streak camera in the single-shot mode. It is demonstrated, how the detector parameters, such as time range (TR) and width of its entrance slit, affect the accuracy …

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