Medium energy charged particle detector with a deflecting electrostatic field for measurement of suprathermal electrons, protons, and neutrals aboard next-generation small satellite-1

•Development, testing, and early operation result of a space instrument are presented.•The instrument can measure and identify charged particles and neutrals in 20–400 keV with a 6.25 keV resolution.•Test results of the flight model instrument against laboratory radioisotopes are provided.•Results from a numerical simulation to estimate the instrument’s performance are discussed.•The instrument capabilities are successfully demonstrated in low-earth orbits.