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Accueil > A propos du LPP > Communication > Actualités archivées > 2017 > LPP electron spectrometer with a 3D instantaneous field of view on the front page of Journal of Geophysical Research – Space Physics online

LPP electron spectrometer with a 3D instantaneous field of view on the front page of Journal of Geophysical Research – Space Physics online

Understanding acceleration mechanisms in planetary magnetospheres or energy dissipation at electron scale in the solar wind requires fast measurement of electron distrubtion functions on a millisecond time scale. Still, since the beginning of space age, the instantaneous field of view of plasma spectrometers is limited to a few degrees around their viewing plane. As a consequence, up to 8 sensor heads are needed to reach a time resolution of several 10’s millisecond, a costly strategy in terms of mass and power consumption. LPP design efforts to develop a new generation of plasma spectrometers that overcome these limitations made it to the front page of Journal of Geophysical Research – Space Physics online. The « donut analyzer » can change the game for future space missions because of its instantaneous hemispheric field of view as shown in the Figure. A set of 2 sensors is sufficient to cover all directions. In addition its high sensitivity compared to state of the art instruments opens the possibility of millisecond time scale measurements in space plasmas.

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(a) Vue d’ensemble du “donut analyzer”. (b) Vue en coupe du spectromètre plasma avec en pointillés l’axe de révolution de son optique torique. Les particules sont défléchies vers le plan de détection. (c) Leur position d’impact sur le détecteur imageur indique la direction de leur vecteur vitesse.

With CNES support, the LPP Space Plasmas Physics Team developed a high fidelity prototype (a quarter of the full donut analyzer) that includes all electronic sub-systems. The prototype weights less than a kilogram. Its low-power consumption imaging detector uses EASIC, a front-end electronics fully developed and qualified by LPP that will fly on Solar Orbiter (ESA) and Parker Solar Probe (NASA) missions. Beam tests of the sensor will be performed in the recently commissioned LPP clean room @UPMC.

Link to the article :
http://onlinelibrary.wiley.com/doi/10.1002/2016JA023596/full

Reference :
Morel, X., M. Berthomier, and J.-J. Berthelier (2017), Electrostatic analyzer with a 3D instantaneous field of view for fast measurements of plasma distribution functions in space, J. Geophys. Res., 122, doi:10.1002/2016JA023596.

Contacts : M. Berthomier, J.-D. Techer


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Tutelles : CNRS Ecole Polytechnique Sorbonne Université Université Paris Sud Observatoire de Paris Convention : CEA
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Directeur de la publication : Pascal Chabert (Directeur)