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| CRaTER | |
|---|---|
| Name | Cosmic Ray Telescope for the Effects of Radiation |
| Mission type | Space science instrument |
| Operator | NASA |
| Manufacturer | Harvard Smithsonian Center for Astrophysics |
| Launch date | 2008-12-05 |
| Launch vehicle | Atlas V |
| Launch site | Cape Canaveral Air Force Station |
| Spacecraft | Lunar Reconnaissance Orbiter |
| Mass | 3.6 kg |
| Power | 4 W |
| Orbit | Lunar polar |
CRaTER
CRaTER is a spaceborne radiation detector aboard the Lunar Reconnaissance Orbiter designed to measure energetic particle fluxes and assess biological and electronic radiation effects in lunar orbit. Funded and managed by entities including NASA and developed at institutions such as the Harvard–Smithsonian Center for Astrophysics, the instrument supports studies connected to missions like Artemis program and complements data from observatories such as ACE and SOHO. CRaTER data inform efforts by agencies and organizations including the Jet Propulsion Laboratory, NASA Johnson Space Center, and the European Space Agency for planning human exploration and robotic missions.
CRaTER was conceived to quantify the linear energy transfer (LET) of galactic cosmic rays and solar energetic particle events in the lunar environment, linking radiation measurements to models used by bodies such as National Academies and International Commission on Radiological Protection. Its mission supports objectives articulated by NASA Human Research Program and contributes constraints useful to modeling efforts by groups at Massachusetts Institute of Technology, California Institute of Technology, and Stanford University. Launch aboard the Atlas V (401) deployed CRaTER with the Lunar Reconnaissance Orbiter into a near-polar lunar orbit to provide spatially resolved radiation mapping contemporaneous with datasets from missions like Chandrayaan-1, SELENE (Kaguya), and Chang'e 1.
The instrument consists of a stack of silicon detectors and plastic scintillators configured to measure LET and dose equivalent, developed by teams at the Harvard–Smithsonian Center for Astrophysics and subcontractors including companies and labs with experience supporting Voyager and Pioneer instruments. Primary components include silicon solid-state detectors, polycarbonate or plastic tissue-equivalent slabs, photodiodes, and associated electronics derived from flight heritage used on platforms such as Ulysses and Mars Science Laboratory. Thermal control, power conditioning, and data handling are integrated to interface with the Lunar Reconnaissance Orbiter spacecraft bus systems managed by NASA Goddard Space Flight Center and instrument operations coordinated with the Deep Space Network.
CRaTER's objectives target quantification of total ionizing dose, LET spectra, and particle species discrimination to infer biological damage proxies used by research groups at Johns Hopkins University, University of Colorado Boulder, University of California, Berkeley, and University of Chicago. The instrument measures charged particle fluxes from sources such as the Galactic cosmic ray background, transient solar proton events associated with Coronal mass ejections observed by STEREO and SOHO, and trapped radiation variations influenced by the Earth–Moon system and lunar surface shielding. Data feed into radiation transport codes like GEANT4 and HETC-HEDS and support risk assessments for crews planned for missions under the Orion spacecraft program and surface systems examined by teams at NASA Ames Research Center.
After integration and test campaigns at facilities including the Harvard–Smithsonian Center for Astrophysics and NASA Goddard, CRaTER launched with the Lunar Reconnaissance Orbiter on an Atlas V from Cape Canaveral Air Force Station; commissioning followed by routine operations conducted from mission operations centers coordinating with the Deep Space Network and science teams at institutions such as Boston University and the University of New Hampshire. Over its operational lifetime CRaTER has recorded data through solar minimum and solar maximum phases characterized in studies by the Solar Cycle community and compared findings with long-term monitors like ACE and Voyager 1. Operational milestones include event detections contemporaneous with spacecraft encounters and cross-calibration campaigns with missions such as MAVEN and Parker Solar Probe.
CRaTER has provided empirical LET spectra demonstrating the role of secondary particles produced in lunar regolith interactions, informing analyses by scientists at Caltech, Princeton University, and Los Alamos National Laboratory. Results have influenced shielding design studies at NASA Johnson Space Center and contributed to radiation environment characterizations referenced by the National Academies and mission planners for Artemis program and commercial partners including SpaceX and Blue Origin. Publications featuring CRaTER data appear alongside comparative studies using observations from instruments on ACE, SOHO, STEREO, and GOES and have been cited in models employed by teams at European Space Agency, Japanese Aerospace Exploration Agency, and Roscosmos.
Calibration campaigns utilized beam facilities and testbeds at organizations such as Brookhaven National Laboratory, Los Alamos National Laboratory, and university accelerator centers affiliated with CERN collaborations to establish response matrices for LET conversion and dose equivalent estimations. Data processing pipelines integrate raw counts into calibrated spectra using community software and transport codes like GEANT4, with processed products archived and served through NASA data systems coordinated with the Planetary Data System and science teams at the Harvard–Smithsonian Center for Astrophysics for use by investigators at institutions including MIT, University of Michigan, and Pennsylvania State University.
CRaTER collaborations span academic, government, and international partners including NASA, Harvard–Smithsonian Center for Astrophysics, Jet Propulsion Laboratory, NASA Goddard Space Flight Center, and universities such as Boston University and University of New Hampshire. Related instruments and complementary datasets include particle sensors on Lunar Reconnaissance Orbiter, radiation monitors on International Space Station, energetic particle detectors on ACE, SOHO, STEREO, Parker Solar Probe, and planetary instruments on Mars Odyssey and MAVEN, enabling cross-disciplinary studies with teams at Johns Hopkins University Applied Physics Laboratory and Southwest Research Institute.
Category:Spacecraft instruments