Conception d'une optique électrostatique à champ de vue hémisphérique pour l'étude des plasmas magnétosphériques, terrestre et planétaires

Abstract : We present the development of an innovative 3D plasma analyzer with a hemispherical field of view that covers an energy range from a few keV to 30 keV, and for which we have studied its' manufacturing process by implementing a lithographic process. After outlining our scientific motivations and the state of the art of electrostatic optics dedicated to the study of space plasmas, we present the concept behind this 3D optic. With two measuring heads, it is possible to overcome the satellites' period of rotation to have a full coverage of the arrival directions of particles. The temporal resolution of the measurements is only determined by the energy scanning speed of the instrument and its' sensitivity that is equivalent to 8 classic 2D field of view detectors. This concept is based on the independent polarization of the internal and external faces of the electrodes. This is made possible by the use of high performance plastic in the realization of the optic's electrodes. Two methods have been developed, that allow the realization of the optic at the laboratory. The first is a method of chemical electroless metallization; the second is a laser lithographic process. The combination of the two processes allows a selective metallization of the electrodes to ensure a linear decrease of potential in some areas of the optic in order to avoid breakdown voltage. Finally, the problem of the electric polarization is discussed and we show how the deep ablation of the polymer allows the polarization of the optic without deterioration of its' performances.
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Submitted on : Monday, September 15, 2014 - 10:29:27 AM
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  • HAL Id : tel-01062842, version 1

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Xavier Morel. Conception d'une optique électrostatique à champ de vue hémisphérique pour l'étude des plasmas magnétosphériques, terrestre et planétaires. Physique des plasmas [physics.plasm-ph]. Université Pierre et Marie Curie - Paris VI, 2012. Français. ⟨tel-01062842⟩

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