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Étude et développement d'un spectromètre de masse et énergie : modélisation et optimisation de l'optique, réalisation du prototype

Joël Becker 1
1 HEPPI - LATMOS
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
Abstract : The objective of my work was to develop, implement and test a neutral mass spectrometer to study planetary exospheres, NIMEIS (Ion and Neutral Mass and Energy Imaging Spectrometer). The particles in the planetary exospheres are signatures of the interaction between the environment and the atmosphere or/and the planet's surface. For this purpose, an ion and neutral mass spectrometer, capable of determining the mass and energy of the particles in the exosphere was defined. A numerical model of the instrument is optimized in order to cover the requested instrumental performances. This numerical model has been then used to design, build and test the first prototype of NIMEIS. I also worked on the development of an ionization source, necessary for the operation of the neutral mass spectrometer. This original ionization source was based on the use of carbon nanotubes as electron emitters. We work in collaboration with a South Korean laboratory that provides us carbon nanotube emitters. Our tasks were to design, build and model device of extraction in the aim to optimize the principle of the electron extraction. I also worked on the definition and optimization of the numerical model of the instrument PICAM (Planetary Ion CAMera). PICAM is an ion mass spectrometer on the BepiColombo mission which will study Mercury's exosphere. The originality of this instrument is to measure mass and energy as well as to provide an instantaneous image of an hemisphere. The goals of the numerical optimization was to start from the design of the instrument DION forthe Phobos-Grunt Mission (Vaisberg et al. 2010) and to increase as much as possible the geometrical factor in order to achieve the required performances in Mercury's exosphere.
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Submitted on : Monday, November 18, 2013 - 10:12:18 AM
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  • HAL Id : tel-00905315, version 1

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Joël Becker. Étude et développement d'un spectromètre de masse et énergie : modélisation et optimisation de l'optique, réalisation du prototype. Instrumentations et Détecteurs [physics.ins-det]. Université Pierre et Marie Curie - Paris VI, 2013. Français. ⟨tel-00905315⟩

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