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The calibration of the Cassini-Huygens CAPS Electron Spectrometer |
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| Authors: | G.R. Lewis,C.S. Arridge,D.R. Linder,D.O. Kataria,A. Persoon,N. André ,P. Schippers,M. Morooka,A.M. Rymer,D.G. Mitchell,S.A. Livi |
| Affiliation: | a Mullard Space Science Laboratory, University College London, UK b Centre for Planetary Sciences, University College London, UK c Department of Physics and Astronomy, University of Iowa, Iowa City, IA, USA d Research and Science Support Department, European Space Agency, Noordwijk, The Netherlands e Centre d’Etude Spatiale des Rayonnements, CNRS/Université Paul Sabatier, Toulouse, France f Swedish Institute of Space Physics, Uppsala, Sweden g Applied Physics Laboratory, Johns Hopkins University, Laurel, MD, USA h Southwest Research Institute, San Antonio, TX, USA i Max-Planck-Institut für Sonnensystemforschung, Katlenburg-Lindau, Germany |
| Abstract: | We present the two-stage method used to calibrate the electron spectrometer (ELS), part of the plasma spectrometer (CAPS) on board the Cassini spacecraft currently in orbit around Saturn. The CAPS-ELS is a top-hat electrostatic analyser designed to measure electron fluxes between 0.5 eV and 26 keV. The on-ground calibration method described here includes the production of photoelectrons, which are energised and passed into the CAPS-ELS in a purpose designed calibration facility. Knowledge of the intensity of these incident electrons and the subsequent instrument output provides an on-ground calibrated geometric factor. Comparative studies of physical quantities such as plasma density and electron differential flux calculated using on-ground calibration factor with the quantities deduced from the wave experiment and high energy electron detector provide in-flight calibration. The results of this are presented together with a comparison of the experimentally calibrated values with simulated calibration values. |
| Keywords: | Cassini Electron Spectrometer Calibration |
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