Development of the LunaH-Map miniature neutron spectrometer

Erik B. Johnson, Craig Hardgrove, Richard Starr, Sam Vogel, Rebecca Frank, Graham Stoddard, Stephen West, James Christian

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

There is strong evidence that water-ice is relatively abundant within permanently shadowed lunar surface materials, particularly at the poles. Evidence for water-ice has been observed within the impact plume of the LCROSS mission and is supported by data gathered from the Lunar Exploration Neutron Detector (LEND) and the Lunar Prospector Neutron Spectrometer (LPNS). Albedo neutrons from the Moon are used for detection of hydrogen, where the epi-Thermal neutron flux decreases as hydrogen content increases. The origin on the concentration of water within permanently shadowed regions is not completely understood, and the Lunar Polar Hydrogen Mapper (LunaH-Map) mission is designed to provide a high-resolution spatial distribution of the hydrogen content over the southern pole using a highly elliptical, low perilune orbit. The LunaH-Map spacecraft is a 6U cubesat consisting of the Miniature Neutron Spectrometer (Mini-NS). Mini-NS is not collimated, requiring a low altitude to achieve a higher spatial resolution compared to previous missions. To develop a compact neutron detector for epi-Thermal neutrons, the Mini-NS comprises of 2-cm thick slabs of CLYC (Cs2LiYCl6), which provide a sensitivity similar to a 10-Atm, 5.7-cm diameter He-3 tubes, as used in LPNS. The Mini-NS digital processing electronics can discriminate by shape and height to determine signal (albedo neutrons) from background (cosmic rays). The Mini-NS achieves a total active sensing area of 200 cm2 and is covered with a cadmium sheet to shield against thermal neutrons. The research and development on the detector modules show a robust design ready for space flight.

Original languageEnglish (US)
Title of host publicationHard X-Ray, Gamma-Ray, and Neutron Detector Physics XIX
PublisherSPIE
Volume10392
ISBN (Electronic)9781510612419
DOIs
StatePublished - Jan 1 2017
EventHard X-Ray, Gamma-Ray, and Neutron Detector Physics XIX 2017 - San Diego, United States
Duration: Aug 7 2017Aug 9 2017

Other

OtherHard X-Ray, Gamma-Ray, and Neutron Detector Physics XIX 2017
CountryUnited States
CitySan Diego
Period8/7/178/9/17

Fingerprint

Neutron spectrometers
neutron spectrometers
Neutron
Spectrometer
Hydrogen
hydrogen
Neutrons
Lunar Prospector
thermal neutrons
Neutron detectors
neutron counters
Ice
albedo
Water
LCROSS (satellite)
Poles
ice
poles
water
lunar exploration

Keywords

  • CLYC
  • Lunar hydrogen
  • Moon
  • Neutron spectrometer
  • Water-ice

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this

Johnson, E. B., Hardgrove, C., Starr, R., Vogel, S., Frank, R., Stoddard, G., ... Christian, J. (2017). Development of the LunaH-Map miniature neutron spectrometer. In Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XIX (Vol. 10392). [103920H] SPIE. https://doi.org/10.1117/12.2276273

Development of the LunaH-Map miniature neutron spectrometer. / Johnson, Erik B.; Hardgrove, Craig; Starr, Richard; Vogel, Sam; Frank, Rebecca; Stoddard, Graham; West, Stephen; Christian, James.

Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XIX. Vol. 10392 SPIE, 2017. 103920H.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Johnson, EB, Hardgrove, C, Starr, R, Vogel, S, Frank, R, Stoddard, G, West, S & Christian, J 2017, Development of the LunaH-Map miniature neutron spectrometer. in Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XIX. vol. 10392, 103920H, SPIE, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XIX 2017, San Diego, United States, 8/7/17. https://doi.org/10.1117/12.2276273
Johnson EB, Hardgrove C, Starr R, Vogel S, Frank R, Stoddard G et al. Development of the LunaH-Map miniature neutron spectrometer. In Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XIX. Vol. 10392. SPIE. 2017. 103920H https://doi.org/10.1117/12.2276273
Johnson, Erik B. ; Hardgrove, Craig ; Starr, Richard ; Vogel, Sam ; Frank, Rebecca ; Stoddard, Graham ; West, Stephen ; Christian, James. / Development of the LunaH-Map miniature neutron spectrometer. Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XIX. Vol. 10392 SPIE, 2017.
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