Instrument Information
IDENTIFIER urn:nasa:pds:context:instrument:ccig.a15a::2.3
NAME Apollo 15 Lunar Surface Experiments Package Cold Cathode Ion Gage Experiment
TYPE Neutral Particle Detector
DESCRIPTION The Apollo 15 Cold Cathode Gage Experiment (CCGE, also referred to as the Cold Cathode Ion Gage, or CCIG) was deployed as part of the Apollo Lunar Surface Experiments package (ALSEP). It was designed to measure the density of neutral particles to determine the amount of gas present at the lunar surface. This data helps constrain the source and loss mechanisms of the tenuous lunar atmosphere. A cold cathode ionization gage was used for this purpose. The gage can determine the amount of gas present, expressed as concentrations of particles per cubic cm or pressure in torrs, but not its composition. The CCGE gage head was roughly 18 x 10 x 12 cm and used 6.5 W. The instrument consisted of the cold cathode ionization gage and associated electronics.
MODEL IDENTIFIER
NAIF INSTRUMENT IDENTIFIER
SERIAL NUMBER not applicable
REFERENCES Apollo 15 Preliminary Science Report, NASA SP-289, 546 pages, published by NASA, Washington, D.C., 1972.

Apollo Scientific Experiments Data Handbook, JSC-09166, NASA TMX-58131, August 1974 (revised April 1976), in Johnson Space Center History Office.

Johnson, F.S., D.E. Evans, and J.M Carroll, Cold Cathode Gage Experiment (Lunar Atmosphere Detector), Apollo 15 Preliminary Science Report, NASA SP-289, pages 13-1 to 13-5, Washington D.C., 1972.

Bates, J.R., W.W. Lauderdale, and H. Kernaghan, ALSEP termination report, NASA Reference Publication Series, NASA-RP-1036, 162 pages, published by NASA, Washington, D.C., 1979.