1 / 9

The Lunar Dust EXperiment (LDEX)

The Lunar Dust EXperiment (LDEX) for the Lunar Atmosphere and Dust Environment Explorer (LADEE) Mission Z. Sternovsky, M. Horányi, E Grün, R Srama * , M. Lankton and D. Gathright LASP, University of Colorado at Boulder Colorado Center for Lunar Dust and Atmospheric Studies,

shina
Télécharger la présentation

The Lunar Dust EXperiment (LDEX)

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. The Lunar Dust EXperiment (LDEX) for the Lunar Atmosphere and Dust Environment Explorer (LADEE) MissionZ. Sternovsky, M. Horányi, E Grün, R Srama*, M. Lankton and D. Gathright LASP, University of Colorado at Boulder Colorado Center for Lunar Dust and Atmospheric Studies, (*) Max-Planck-Institute for Nuclear Physics, Heidelberg, Germany

  2. LADEE motivation LADEE: Lunar Atmosphere and Dust Environment Explorer Remote observations of the Na exosphere (Potter & Morgan, 1998) • Identified species: 40Ar, 36Ar, 222Rb, He, Na, K C, N, O, CO2, CH4 • Measurements are not detailed enough • Accurate composition measurements BEFORE disturbing by increased robotic and human activity Is dust really lofting from the lunar surface?

  3. LADEE Payload Neutral Mass Spectrometer (NMS) MSL/SAM Heritage UV Spectrometer (UVS) LCROSS heritage SMD - Directed instrument SMD - Directed instrument In situ measurement of exospheric species P. Mahaffy NASA GSFC (Directed – SMD) Dust and exosphere measurements A. Colaprete NASA ARC (Directed – SMD) 300 Dalton range/unit mass resolution Lunar Dust EXperiment (LDEX) Impact ionization dust detector Lunar Laser Com Demo (LLCD) Technology demonstration High Data Rate Optical Comm D. Boroson MIT-LL (Directed – SOMD) HEOS 2, Galileo, Ulysses and Cassini Heritage M. Horányi LASP (Competed – SMD) 51-622 Mbps SMD - Competed instrument

  4. The dust environment • 2 dust sources: • Electrostatic lofting near the terminator region • Secondary ejecta from micrometeoroid bombardment Lofted dust Detectable single impact events The expected dust density at 50 km altitude as a function of dust size (M. Horanyi) Impact ejecta

  5. LDEX: operation principle Detectors: - target charge sensitive amp (e-) - Microchannel plate (ions) Integrated charge from particle <0.25 micron Impact ionization Q/m ≈ 2 C/kg (3,000 e- for r = 0.25 micron)

  6. LDEX: Ion optics design Dust Target A Gnd Dust Ion Paths -1600 V Grid MCP -1100 V -1100 V Plate Dust Hemi Grid -200 V

  7. Lunar Trajectory Use of Phasing Loops compensates for dispersions from Minotaur V

  8. UV environment LADEE orbit UV reflection from Moon Low UV backgrnd. No science • UV from the sun is prohibitive for science • UC reflected from the Moon drives: • Instrument geometry • Materials used • Finishes and coatings

  9. Summary and conclusions • LDEX is on schedule for a lunch on Friday 5/25/2012 • Calibration at both in Heidelberg and CCLDAS

More Related