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Cosmic Dust Experiment (CDE) Science and Calibration

Cosmic Dust Experiment (CDE) Science and Calibration. David James University of Colorado/LASP 303-492-5208 david.james@lasp.colorado.edu. Science Goals. Monitor the cosmic dust flux variability : CDE measures dust flux using an impact detector.

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Cosmic Dust Experiment (CDE) Science and Calibration

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  1. Cosmic Dust Experiment (CDE)Science and Calibration David James University of Colorado/LASP 303-492-5208 david.james@lasp.colorado.edu

  2. Science Goals Monitor the cosmic dust flux variability : CDE measures dust flux using an impact detector. Measurement at S/C is directly related to dust input to the mesosphere.

  3. Dust Detection using PVDF Depolarization induced current PVDF Film Al/Ni Contacts

  4. Calibration and Validation Plan • Calibration is performed in two steps: • Electronics (DN to charge) • Performed at LASP 9/16-9/20 • PVDF Detectors (Charge to mass, given velocity) • SDC calibration with dust accelerator in Heidelberg, Germany is complete • Proposed CDE calibration in early 2006

  5. E-box Calibration • Calibration of Electronics was performed at LASP before (abbreviated) and after the environmental (full) testing • Tested full dynamic range of each signal chain 104-1010e charges at 21 individual values (100 events at each of the 21 values injected externally). • Tested over full range of E-box temperatures (-26 to 50oC) • Full calibration at -26, 0, 15, 30, 50°C • Pre-Environmental Calibration at 20oC • Repeated for all 14 channels • Total Calibration generated 14 x 5 x 21 = 1476 data sets of 100 hits.

  6. Calibration Setup – External Charge Injection Environmental Chamber Injection Circuit to Simulate Detector Signal Data Collection

  7. Sample CDE Calibration Curves

  8. Simpson-Tuzzolino Curve

  9. CDE will maximize impact rates CDE detector area ~ 0.1 m2 300 hits/day @ 0.1 m threshold 3 hits/day @ 1.0 m threshold Science requirement: 100 hits/week → 0.7 m threshold mass

  10. PVDF Detectors 100 hits/day 15 km/s To meet science requirement of 100 hits/week must have a noise floor of 106 electrons. 10 13 100 hits/week on ~ 0.1 m2

  11. CDE Noise Characterization Noise floor well below required 106 electrons. CDE satisfies its science requirements! 9*105 e level

  12. Calibration Summary • Charge injection calibration has been completed and is ready for integration into ground processing software • Determination of noise floor via zero threshold noise collection verifies that CDE meets science requirements • CDE is ready to ship and meets science requirements

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