摘要：Low-energy ion experiments–ion mass analyzer (LEPi) is one of the particle instruments onboard the ERG satellite.LEPi is an ion energy-mass spectrometer which covers the range of particle energies from < 0.01 to 25 keV/q.Species of incoming ions are discriminated by a combination of electrostatic energy-per-charge analysis and the time-of-flight technique.The sensor has a planar field-of-view, which provides 4 \(\pi\) steradian coverage by using the spin motion of the satellite.LEPi started its nominal observation after the initial checkout and commissioning phase in space.
