The ECRA thruster is an electric satellite thruster developed at ONERA. It uses microwaves to ionize the propellant gas. The plasma thus created is accelerated in a magnetic nozzle, which converts electronic energy into ionic axial momentum. It is the ejection of this ion flow that is responsible for the thrust produced by the thruster. Recent developments and results obtained at ONERA on this type of thruster demonstrate the potential of this technology. The prototypes of this thruster developed to date are suitable for small satellite platforms, with electrical power ranging from 20W to 200W. Developing ECRA thrusters with higher electrical power is necessary to equip larger platforms, to offer an alternative to neutralizing cathode thrusters, but also for iodine propulsion applications for satellite constellations and aerobic propulsion in low orbits (ABEP). The research project will therefore focus on developing higher-power thruster prototypes (the goal being to exceed 500W) and establishing thruster scaling laws to guide future adaptations to platform requirements. 

The thesis topic will propose a theoretical and experimental approach consisting of gathering available data from the two prototypes already operational at ONERA, as well as data present in scientific literature, in order to deduce scaling laws that can guide future developments. These scaling laws will be defined by developing a theoretical model that is as simple as possible but captures the main characteristics of the engines identified in the bibliography. This model will be used to define one or more prototypes to be built. These prototypes will then be implemented and characterized in ONERA's laboratories.

This thesis project applies the physics of radiofrequency plasma discharges and plasma-magnetic field interaction. It will enable the candidate to develop their knowledge and skills in theoretical discharge model development, as well as their experimental physics skills through the characterization of the prototypes developed.

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For more Information about the topics and the co-financial partner (found by the lab!); contact Directeur de thèse - Paul-Quentin.Elias@onera.fr

Then, prepare a resume, a recent transcript and a reference letter from your M2 supervisor/ engineering school director and you will be ready to apply online before March 13th, 2026 Midnight Paris time!

Grandes Écoles and/or Master's degree in “Applied Physics,” “Plasma Physics,” “Fundamental Physics,” “General Physics”