Design of electrostatic analyzer

This instrument is designed to detect and analyze precipitating electrons in the energy range from 50 eV to 20 keV. It is one of the supplementary sensors on board the Block 5D configuration satellites of the Defense Meteorological Satellite Program. Differential energy analysis is performed by a pair of electrostatic analyzers (ESA) in which a time sequenced variable electrostatic field deflects electrons of selected energies toward and exit aperture where they are counted by Channeltron Electron Multipliers (CEM). The small ESA covers energies ranging from 50 eV to 1 keV; the larger, 1 keV to 20 keV. The dwell time at each energy level is 98 ms, with both analyzers operating simultaneously. A complete 16 point spectrum is produced once per second and the 16 data words are transferred to the satellite on command. Figure 1 shows SSJ/3 with its test console.