CCLDAS kickoff March 13, 2009
CCLDAS: Instrument development
Z. Sternovsky, and the CCLDAS team
LASP, University of Colorado, Boulder, CO
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• Motivation for dust instruments on and around the Moon
• ELDA: Electrostatic Lunar Dust Analyzer
• LDEX: Lunar Dust Experiment
• Summary
Outline
3Dust near the surface and in the exosphere
Submicron sized dust• n ~ exp(H/HS), HS = 5 – 20 km• at 50 km alt. n ≈ 100 m-3 • 0.1 micron
LEAM: Lunar Ejecta and Meteorite Experiment
Clementine observations
4ELDA: Electrostatic Lunar Dust Analyzer
• PIDDP development (start summer of 2008)
• Wire electrode array to detect the charge on the dust
• Accurate trajectory reconstruction (1% speed, 1 deg direction)
Dust Trajectory Sensor (DTS)
5ELDA cont.
CU laboratory measurements
6ELDA cont.
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ELDA: Combination of DTS with a deflection unit to Measure the charge, mass and trajectory (source) of single dust grains on the lunar surface
Under development
7LDEX: Lunar Dust Experiment• Dust detector for the LADEE mission• UV spectrometer and neutral mass spectrometers on LADEE• On-orbit dust detection ( approx. 20 – 100 km altitude range)• Sensitivity to r = 0.2 micron dust• Launch March 2012
LDEX prototype instrument built at LASP
8LDEX testing and calibrationHeidelberg dust accelerator
Submicron Fe particles, v = 1-20 km/s
Q = 0.5 m v3.5
Impact signal
Impact charge QI mass mTime constant τI impact velocity
Dust
9LDEX operation principle
Operation principle• Impact ionization dust detector• MCP is used for improved sensitivity
10LDEX current status
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Summary
• Instrument development for future missions are part of the CCLDAS goals
• Instruments– Dust detectors for orbit (LDEX)– Lunar dust transport monitor (ELDA)– Impact monitoring and composition analysis (LAMA)– Electric field and plasma probes for the lunar surface