 Francis Leblanc and Robert E. Huffman of the Phillips Laboratory were Principal Investigators.The Quadrupole Ion Neutral Mass Spectrograph was designed to support the CIRRIS 1A experiment by providing positive ion and neutral contaminant species identifications, concentrations, and temporal variabilities.The sensor package was made up of an electron impact ion source, an ion-focusing grid system, a set of quadrupole rods, and an electron multiplier.