BEGIN:VCALENDAR VERSION:2.0 PRODID:Events Booking BEGIN:VEVENT UID:69dbda49598a6 SUMMARY:A Free Online VKI Seminar - Single shot coherent Rayleigh-Brillouin scattering: Neutral gas & plasma flow multi-point thermodynamic character ization (temperature\, density and flow velocity) in a non-resonant\, non- intrusive and seed-less way DESCRIPTION:A Free Online VKI Seminar Single shot coherent Rayleigh-Brill ouin scattering: Neutral gas &\; plasma flow multi-point thermodynamic characterization (temperature\, density and flow velocity) in a non-resona nt\, non-intrusive and seed-less way Our Guest Speaker: Dr. Alexandros Gerakis\, Senior Research &\; Technology Associate\, Luxembourg Institu te of Science and Technology Abstract: Metrology is a founding pillar an d a driving force of scientific discovery and understanding. Albeit its ke y importance in all aspects of science and engineering\, the field is stil l dominated by the use of mechanical\, intrusive probes for flow velocity and pressure measurements. To tackle the matter\, which is of key importan ce to the development of a plethora of science and engineering fields\, ou r group is developing single shot coherent Rayleigh-Brillouin scattering ( CRBS) as an alternative\, non-intrusive probe for neutral and plasma flow thermodynamic characterization.   CRBS is a four-wave mixing diagnost ic technique that relies on the creation of an optical lattice in a medium due to the interaction between polarizable particles and intense laser fi elds. Single shot CRBS1 has been demonstrated to be the coherent analog of spontaneous Rayleigh-Brillouin scattering in measuring the temperature\, pressure\, bulk and shear viscosity\, speed of sound and polarizability of a gas or gas mixture2\, as well as nanoparticles produced in an arc disch arge3. In this talk\, an overview on the theory and experimental aspects o f single shot CRBS will be presented along with our recent work in measuri ng simultaneously the temperature\, density (and thus the pressure) and fl ow velocity4\,5 of neutral species in a neutral gas flow and radially acro ss a glow discharge. Finally\, the feasibility and working progress toward s the use of CRBS as a thermodynamic characterization technique for partia lly/fully ionized gases as well as of liquid flows will be discussed.  References: Gerakis\, A.\, Shneider\, M. N.\, and Barker\, P. F.\, “Single-shot coherent Rayleigh-Brillouin scattering using a chirped opti cal lattice\,” Opt. Lett.\, Vol. 38\, No. 21\, 2013\, pp. 4449–4452. Gerakis\, A.\, Shneider\, M. N.\, and Stratton\, B. C.\, “Remote-sensin g gas measurements with coherent Rayleigh-Brillouin scattering\,” Applie d Physics Letters\, Vol. 109\, No. 3\, 2016\, p. 31112. Gerakis\, A.\, Y eh\, Y.-W.\, Shneider\, M. N.\, Mitrani\, J. M.\, Stratton\, B. C.\, and R aitses\, Y.\, “Four-Wave-Mixing Approach to In Situ Detection of Nanopar ticles\,” Phys. Rev. Applied\, Vol. 9\, 2018\, p. 014031. Gerakis\, A. \, Bak\, J.\, Randolph\, R.\, Shneider\, M. N.\, “Demonstration of singl e shot laser velocimetry with coherent Rayleigh-Brillouin scattering”\, AIAA Scitech 2021 Forum\, 2021\, p. 0224. Gerakis\, A.\, Bak\, J.\, Rand olph\, R.\, Shneider\, M. N.\, “Seedless\, non-resonant gas flow velocim etry with single shot coherent Rayleigh-Brillouin scattering”\, Phys. Re v. Applied\, Manuscript accepted Short Biography: Alexandros Gerakis is a Senior Research &\; Technology Associate at the Luxembourg Instit ute of Science &\; Technology (LIST) and a 2021 FNR ATTRACT Fellow. Pri or to joining LIST\, he was an Assistant Professor at the Aerospace Engine ering Department\, Texas A&\;M University\, leading the “Optical Prob ing &\; Manipulation” Group (he remains an Adjunct Professor with the Department)\, an Associate Research Physicist at the Princeton Plasma Phy sics Laboratory\, while he postdoc’d at Harvard University. He holds a P hD in Physics from University College London\, UK\, a Master’s degree fr om St Andrews and Herriot-Watt Universities\, UK\, in \"Photonic and Optoe lectronic Devices\" and a BSc from the School of Applied Mathematical and Physical Sciences\, National Technical University of Athens\, Greece. Dr. Gerakis' research focuses on the development of advanced laser concepts fo r particle manipulation and diagnostics with a plethora of uses in neutral and plasma flows\, nanotechnology\, propulsion\, quantum optics and funda mental atomic\, molecular and optical physics. Over the years his research has been funded by the NSF\, DOE\, ONR and NASA in the USA\, and the FNR in Luxembourg.     LOCATION:Sint-Genesius-Rode\, 1640 Flemish Brabant\, Belgium DTSTART:20231212T110000Z DTEND:20231212T120000Z DTSTAMP:20220307T101637Z ORGANIZER;CN=VKI Secretariat:MAILTO:secretariat@vki.ac.be GEO:50.73507;4.396005 X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=Sint-Genesius-Rode\, 1640 F lemish Brabant\, Belgium;X-APPLE-RADIUS=72;X-TITLE=von Karman Institute fo r Fluid Dynamics:50.73507;4.396005 END:VEVENT END:VCALENDAR