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UID:47@atst.osups.universite-paris-saclay.fr
DTSTART;TZID=Europe/Paris:20241218T140000
DTEND;TZID=Europe/Paris:20241218T160000
DTSTAMP:20241213T121820Z
URL:https://atst.osups.universite-paris-saclay.fr/calendrier/soutenance-de
 -these-gwendal-henaff-mercredi-18-decembre-a-14h-au-lpp-palaiseau/
SUMMARY:Soutenance de thèse Gwendal Hénaff -  mercredi 18 décembre à 14
 h au LPP-Palaiseau
DESCRIPTION:transmis par Matthieu Berthomier (LPP)\n\nTitre : Modeling\, de
 velopment\, and test of a 3D-printed plasma camera for in-situ measurement
 s in space\nLieu: Amphi Becquerel\, Ecole Polytechnique\nVisio: https://cn
 rs.zoom.us/j/94006980904?pwd=LD4CXeKU3RLZ8UnF4BxhxICJlzfOIb.1\nMeeting : 9
 40 0698 0904 / n42B1H\n\nRésumé:\nSpace plasma dynamics are governed by 
 multi-scale phenomena. However\, the reference instruments used to measure
  the energy distribution of charged particles have a limited field of view
 . Adding electrostatic deflection systems overcomes this limitation but ha
 s the disadvantage of making these instruments heavier\, slowing their mea
 surement cadence\, and ultimately reducing their performance. It is theref
 ore crucial to develop compact and high-performance instruments suited for
  satellite constellations. This thesis focuses on the development of instr
 uments based on an innovative toroidal topology that provides an instantan
 eous hemispherical field of view\, effectively turning them into true plas
 ma cameras.\nThe development of a parametric tool enabled the numerical ch
 aracterization of tens of instruments with various sizes and angular resol
 utions to address different scientific needs. A compact model designed for
  space weather monitoring was developed using innovative 3D printing and s
 elective metallization processes. This plasma camera features 64 viewing d
 irections\, an energy range up to 22 keV\, and a dual ion/electron detecti
 on capability enabled by a carbon-based conversion layer. Weighing 1.8 kg 
 with a diameter of 19 cm\, this instrument is well suited for nanosatellit
 es.\nThe principle of the conversion system was validated under helium and
  nitrogen ion beams. The electrostatic optics was characterized under an e
 lectron beam across a wide range of energies and angles\, with results clo
 sely matching simulations\, thereby increasing confidence in numerical mod
 elling. Following this thesis and with the support of CNES\, a fully opera
 tional model of this plasma camera will be developed\, aiming in-orbit dem
 onstration in the coming years.\n\nJury:\nDr. Iannis Dandouras\, IRAP - Ra
 pporteur\nDr. Jim Raines\, University of Michigan - Rapporteur\nDr. Vincen
 t Maget\, ONERA - Examinateur\nPr. Pascal Chabert\, Ecole Polytechnique - 
 Examinateur\nDr. Pierre Henri\, OCA Lagrance/LPC2E - Examinateur\nDr. Matt
 hieu Berthomier\, LPP - Directeur de Thèse\nDr. Carla Costa\, CNES - Invi
 tée
CATEGORIES:Séminaires et soutenances de thèse/HDR
LOCATION:LPP\, Palaiseau / Paris\, France
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TZID:Europe/Paris
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BEGIN:STANDARD
DTSTART:20241027T020000
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
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