Bulletin of the American Physical Society
75th Annual Gaseous Electronics Conference
Volume 67, Number 9
Monday–Friday, October 3–7, 2022;
Sendai International Center, Sendai, Japan
The session times in this program are intended for Japan Standard Time zone in Tokyo, Japan (GMT+9)
Session ET3: Laser Diagnostics I
1:30 PM–3:30 PM,
Tuesday, October 4, 2022
Sendai International Center
Room: Hagi
Chair: Andrew Gibson, Ruhr University Bochum, Germany
Abstract: ET3.00003 : GEC Student Excellence Award Finalist Presentation - Experimental and numerical investigation of low-pressure iodine plasmas*
2:00 PM–2:15 PM
Presenter:
Benjamin Esteves
(LPP, Ecole Polytechnique)
Authors:
Benjamin Esteves
(LPP, Ecole Polytechnique)
Cyril Drag
(LPP, CNRS, Ecole Polytechnique)
Alejandro Alvarez Laguna
(LPP, CNRS, Ecole Polytechnique)
Anne Bourdon
(LPP, CNRS, Ecole Polytechnique)
Pascal Chabert
(LPP, CNRS, Ecole Polytechnique)
Collaboration:
LPP Propulsion Team
This work investigates iodine as an alternative propellant for space plasma propulsion. Measurements are taken in a low-pressure inductively-coupled plasma chamber used as the ionization stage of an ion-gridded plasma thruster. Spatially resolved optical and electrostatic diagnostics are developed and implemented. First, charged species are characterized using Langmuir probes and laser-induced photodetachement diagnostics. Then, atomic absolute temperature and density measurements (with a focus on the two first electronic states: the ground state and the first excited state only 0.94 eV above) are conducted using laser absorption spectroscopy at several wavelengths and the TALIF (Two-photon Absorption Laser Induced Fluorescence) technique. Furthermore, the molecular dissociation rate is measured using laser absorption spectroscopy beyond 20000 cm-1 where the diffusive part of the absorption spectrum leads exclusively to molecular photodissociation. Finally, the experimental results are gathered and compared to a global model and 1D fluid simulations to validate the existing iodine set of cross-sections.
*B. Esteves acknowledges the financial support from L’ Agence Innovation Défense de laDélégation Générale de L’Armement (DGA) and École Polytechnique.
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