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Accueil > A propos du LPP > Communication > Actualités archivées > 2020 > Florian Marmuse defended his PhD "Iodine plasmas : experimental and numerical studies. Application to electric propulsion.”

Florian Marmuse defended his PhD "Iodine plasmas : experimental and numerical studies. Application to electric propulsion.”

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Florian Marmuse defended his PhD on " Iodine plasmas : experimental and numerical studies. Application to electric propulsion” on July 9 at Ecole Polytechnique.

Abstract :
Iodine is an alternative propellant for the electric propulsion of satellites, offering performances comparable to xenon. As of 2020, propulsion systems running on iodine are already on the market. These good performances are linked to the very low dissociation energy of I2, leading to a plasma similar to an atomic xenon plasma. To which extent can the molecular and electronegative nature of iodine plasmas be neglected ? An existing global model for I2 plasmas is further developed and fully recoded in python, to enable fast parametric studies, uncertainty quantification, and integrate electronegative effects. Tools and processes are developed to ensure the safety of operators and experimental setups during iodine experiments. Four optical diagnostics are developed and installed on the ionization chamber of the PEGASES thruster. They lead for the first time to the density and temperature of I, and the density of I2 : emission spectroscopy, laser absorption coupled to Doppler-free saturated absorption spectroscopy at 10969 cm−1 and 11036 cm−1, laser absorption spectroscopy at 7603 cm−1, and broadband absorption spectroscopy from 480nm to 500nm. Langmuir probe measurements yield the electron density and temperature. Confronting this data to the model shows that the model overestimates the molecular dissociation and the electron density. These discrepancies can be partly explained by underestimated power losses phenomena in the plasma, possibly linked to its molecular and electronegative nature. This work gives leads for future theoretical work and diagnostics on I2 plasmas. It proposes an updated model and a set of new diagnostics for use to further develop propulsion systems.

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CNRS Ecole Polytechnique Sorbonne Université Université Paris-Saclay Observatoire de Paris
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Exploitant du site : Laboratoire de Physique des Plasmas, Ecole Polytechnique route de Saclay F-91128 PALAISEAU CEDEX
Hébergeur : Laboratoire de Physique des Plasmas, Ecole Polytechnique route de Saclay F-91128 PALAISEAU CEDEX
Directeur de la publication : Anne Bourdon (Directrice)

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