CDE CDR, September 14, 2004 Your Position, Your Name 1 GATS CDE Pre-Ship Review October 6, 2005 Science and Calibration David James 1 GATS Cosmic Dust Experiment (CDE) Science and Calibration David James University of Colorado/LASP

CDE CDR, September 14, 2004 Your Position, Your Name 2 GATS CDE Pre-Ship Review October 6, 2005 Science and Calibration David James 2 GATS 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.

CDE CDR, September 14, 2004 Your Position, Your Name 3 GATS CDE Pre-Ship Review October 6, 2005 Science and Calibration David James 3 GATS Dust Detection using PVDF Depolarization induced current PVDF Film Al/Ni Contacts

CDE CDR, September 14, 2004 Your Position, Your Name 4 GATS CDE Pre-Ship Review October 6, 2005 Science and Calibration David James 4 GATS 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

CDE CDR, September 14, 2004 Your Position, Your Name 5 GATS CDE Pre-Ship Review October 6, 2005 Science and Calibration David James 5 GATS 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 e 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 50 o C) –Full calibration at -26, 0, 15, 30, 50°C –Pre-Environmental Calibration at 20 o C Repeated for all 14 channels Total Calibration generated 14 x 5 x 21 = 1476 data sets of 100 hits.

CDE CDR, September 14, 2004 Your Position, Your Name 6 GATS CDE Pre-Ship Review October 6, 2005 Science and Calibration David James 6 GATS Calibration Setup – External Charge Injection Injection Circuit to Simulate Detector Signal Environmental Chamber Data Collection

CDE CDR, September 14, 2004 Your Position, Your Name 7 GATS CDE Pre-Ship Review October 6, 2005 Science and Calibration David James 7 GATS Sample CDE Calibration Curves

CDE CDR, September 14, 2004 Your Position, Your Name 8 GATS CDE Pre-Ship Review October 6, 2005 Science and Calibration David James 8 GATS Simpson-Tuzzolino Curve

CDE CDR, September 14, 2004 Your Position, Your Name 9 GATS CDE Pre-Ship Review October 6, 2005 Science and Calibration David James 9 GATS CDE will maximize impact rates CDE detector area ~ 0.1 m  m threshold  m threshold Science requirement: 100 hits/week → 0.7  m threshold mass

CDE CDR, September 14, 2004 Your Position, Your Name 10 GATS CDE Pre-Ship Review October 6, 2005 Science and Calibration David James 10 GATS 15 km/s 10 PVDF Detectors hits/week on ~ 0.1 m hits/day To meet science requirement of 100 hits/week must have a noise floor of 10 6 electrons.

CDE CDR, September 14, 2004 Your Position, Your Name 11 GATS CDE Pre-Ship Review October 6, 2005 Science and Calibration David James 11 GATS Noise floor well below required 10 6 electrons. CDE satisfies its science requirements! CDE Noise Characterization 9*10 5 e level

CDE CDR, September 14, 2004 Your Position, Your Name 12 GATS CDE Pre-Ship Review October 6, 2005 Science and Calibration David James 12 GATS 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