The Low-energy Imaging Particle Spectrometer (LIPS) is configured as a "pinhole camera" with particle-specific scintillator focal planes. The scintillators are designed specifically to respond only to either protons or electrons within a specific energy range. The scintillators are coupled directly to a multi-anode photomultiplier tube (PMT). Owing to their particle-specific response, the scintillators themselves provide the particle discrimination. The pulse amplitude defines the particle energy and the spatial position provides angular information.
