160 Instrumental development for the analysis of internal discharge on space

Job title:

160 Instrumental development for the analysis of internal discharge on space

Company:

Centre National d’Etudes Spatiales

Job description

25-160 Instrumental development for the analysis of internal discharge on spacePostuler25-160 Instrumental development for the analysis of internal discharge on space

• Doctorat, 36 mois
• Temps plein
• Indifférent
• Maitrise, IEP, IUP, Bac+4
• Space environment and effects

PostulerMissionIn space environment, satellites have to cope with irradiation of energetic particles (electrons, protons) which can lead to an accumulation of electric charges on devices and insulators and to the initiation of discharges and electric arcs. For several years, the “internal charge” (charge inside the satellite) and associated insulation breakdowns have been suspected of being responsible for a certain number of anomalies observed in flight. Electric arcs produce electromagnetic disturbances which can interfere with electronics, generate errors (Upsets) and seriously damage the most sensitive electronic components. These electric arcs can also significantly degrade the electrical properties of internal insulators and lead to an increasing risk of breakdown.The objective of this PhD study here is to study the dynamics of the internal charge and to characterize electrostatic discharges on different elements considered “at risk” with regard to this problem (printed circuits, connectors, cables). This study mainly requires experimental and instrumental work supported by physical analysis and numerical simulation activity. After a first phase which will consist of identifying, through an analysis and/or numerical simulation, the space mission profiles at risk and deducing the charging levels likely to be reached in orbit, we will focus our attention on the definition of the experimental methods allowing on the one hand to highlight the charge kinetics of the irradiated materials and, on the other hand, to characterize the electrical discharges (duration, amplitude, waveform).A specific attention will be paid to the development of instruments allowing the least intrusive measurements possible. We propose to adapt a floating measurement technique implemented as part of a current thesis and which makes it possible to characterize “surface” electrostatic discharges (occurring on the external skin of the satellite) with a minimal disruption. The next step will consist of creating and integrating the instrumentation on a table test bench then under vacuum and finally under a medium and/or high energy electron beam, which will in turn make it possible to check the performance of the instrumentation then to validate them under conditions representative of space environment.This experimental phase therefore aims at characterizing the charging levels, and at locating and identifying the discharges produced under irradiation on realistic critical systems. Depending on the complexity of the experimental setup and the irradiation conditions ultimately chosen to simulate the risk, we will consider creating a digital model of the experiment to obtain the missing physical parameters (charge distribution, field lines, etc.). Finally, we will be interested, in a more prospective manner, in the coupling of these internal electrostatic discharges on electronics on board satellites by instrumenting mock-ups connected to the source object of the discharge. Simple measurements of dielectric rigidity will also make it possible to observe the possible degradation induced by the accumulation of discharges.This PhD work will thus allow us providing technical and instrumental solutions to evaluate the levels of internal charge and the consequences of the resulting discharges in a series of risk situations. At the end of this study, we will evaluate the work to be carried out to develop space on-board instrumentation of this type.For more Information about the topics and the co-financial partner (found by the lab !);contact Directeur de thèse –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 14th, 2025 Midnight Paris time !ProfilMaster 2 or Engineering School in Applied Physics, with experience in physical/electrical/electronic instrumentation

Expected salary

Location

Toulouse

Job date

Wed, 05 Feb 2025 06:29:16 GMT

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