Mercury Plasma Particle Experiments - Energetic Neutrals Analyzer (ENA)
Energetic Neutrals Analyzer (ENA), one of the MPPE sensors onboard Mio, measures mass-identified energetic neutral atoms from 10 eV to 3.3 keV to study abundance of neutrals from the surface and coupling between the magnetosphere and exosphere at Mercury. It consists of conversion surface, photon absorbing surfaces, microchannel plates (MCPs), high-voltage supply units.
Field of view | 15 deg × 160 deg |
Angular resolution | 9 deg × 25 deg (FWHM) |
Energy range | 10 eV–3.3 keV |
Energy resolution | 0.5 (ΔE/E) |
Mass resolution | H, O and heavy particles |
Geometrical factor | 10 -2 cm2streV/eV/sector |
Mass | 2.13 kg |
Power | 4.42 W (secondary side) |
Dimensions | 258 mm × 127 mm × 223 mm (w/o thermal shield) |
Data rate | 0.5 kBytes/s (nominal) after factor 4 compression |