Charged and neutral particle analyzer for Tianwen-2 mission

<p indent="0mm">The Tianwen-2 mission aims at exploring the near-Earth asteroid 2016HO3 and the main belt comet 311P by means of near-distance measuring and asteroid sampling and return. As one of main payloads of the Tianwen-2 mission, the Charged and Neutral Particle Analyzer (CANPA) will measure <italic>in-situ</italic> the plasmas and neutral atmosphere around the asteroid and the comet. The CANPA instrument is highly integrated and miniaturized, and composes four independent subsystems: the thermal ion analyzer (TIA), the thermal electron analyzer (TEA), the solar wind ion analyzer (SIA) and the gas and ion analyzer (GIA). The flight model has been calibrated by using the on-ground calibration system. The results show that the TIA can measure thermal ions at the energy range of <sc>2.79 eV–32.03 keV</sc> with an energy resolution of 8.79%. The TEA can measure thermal electrons at the energy range of <sc>1.07 eV–20.61 keV</sc> with an energy resolution of 14.29%. Both TIA and TEA have the field-of-view of 360° × 90°. The SIA can measure solar wind ions at the energy-per-charge range of <sc>5 eV–5 keV</sc> with an energy resolution of 4.23%. The GIA can measure neutral gas and ions of the comet ionosphere at the mass range of 1–350 amu and the mass resolution is about 0.17 amu@1–50 amu, 0.52 amu@51–150 amu, and 1.22 amu@151–350 amu. The CANPA instrument can fulfill the detection requirements for the asteroid and the comet.