Author/Authors :
Lewis، نويسنده , , G.R. and Arridge، نويسنده , , C.S. and Linder، نويسنده , , D.R. and Gilbert، نويسنده , , L.K. and Kataria، نويسنده , , D.O. and Coates، نويسنده , , A.J. and Persoon، نويسنده , , A. and Collinson، نويسنده , , G.A. and André، نويسنده , , N. and Schippers، نويسنده , , P. and Wahlund، نويسنده , , J. and Morooka، نويسنده , , M. and Jones، نويسنده , , G.H. and Rymer، نويسنده , , A.M. and Young، نويسنده , , D.T. and Mit، نويسنده ,
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
