SESAME Status K. Seidensticker 1 , H.-H. Fischer 1 , M. Knapmeyer 2 , K. Thiel 3 ,
description
Transcript of SESAME Status K. Seidensticker 1 , H.-H. Fischer 1 , M. Knapmeyer 2 , K. Thiel 3 ,
4th Philae Science Workshop
Venice, 30 March - 1 April 2009
SESAMECASSE • DIM • PP
SESAME Status
K. Seidensticker1, H.-H. Fischer1, M. Knapmeyer2, K. Thiel3,I. Apathy4, W. Schmidt5 and the SESAME team
1DLR (Köln) , 2DLR (Berlin), 3University of Köln, 4KFKI (Budapest),5FMI (Helsinki)
24th Philae Science Workshop
Venice, 30 March - 1 April 2009
SESAMECASSE • DIM • PP Outline of Talk
Recent flight operations• PC8, Steins Flyby and Thermal Characterization 2
Flight Software FM-3
CASSE lab experiments
Operation planning until Hibernation
Preview on comet operations
Funding and personnel
Conclusions
34th Philae Science Workshop
Venice, 30 March - 1 April 2009
SESAMECASSE • DIM • PP Recent Flight Operations: PC8
Fit of Flywheel vibration spectrum(Speed 10 = 9923 rpm)
44th Philae Science Workshop
Venice, 30 March - 1 April 2009
SESAMECASSE • DIM • PP Recent Flight Operations: THC2
+Z Orbiter
+X Orbiter
+X Lander
175 ° 192 °
+Z Lander
Sun illumination during THC2
Sole temperature profiles during third run of procedure LSE_TCHAR obtained with a preliminary calibration derived from Steins Flyby data. The Orbiter slew maneuver to position 192° started at 14:00
SCET.
54th Philae Science Workshop
Venice, 30 March - 1 April 2009
SESAMECASSE • DIM • PP Operation Summary
Flywheel Listening• CASSE: Strong vibration (≥ factor 30 above RW background), mainly at
fundamental frequency and harmonics; CASSE data used for new calibration of FW rotation rate.
• DIM: No interference observed
• PP: Broad electrical noise; lines at FW speed and higher frequencies; PP operation is corrupted above 8000 rpm (> speed 00).
Temperature Calibration• Preliminary calibration achieved; data base complete after THC2; final
evaluation pending
CDMS and Telemetry• Large improvement compared to PC6 (no data corruption; only one
science packet lost during PC8)
64th Philae Science Workshop
Venice, 30 March - 1 April 2009
SESAMECASSE • DIM • PP
Flight Software FM-3
Major upgrades implemented / planned for SW FM-3• CASSE: Fixing of wrong channel assignment (due to FPGA program flaw:
missing reset)
• CASSE: Automatic adjustment of gain and trigger levels
• CASSE: Stacking of sounding measurements for improved S/N ratio
• CASSE: Improved synchronization means for Listening of MUPUS-Pen insertion (better time resolution, evaluation of MUPUS-PEN depth information)
• DIM: Autonomous measuring depending on dust flux and sensor status
• General: Temperature measurements with extended range (<= -105 °C)
FM-3 shall be uploaded during PC #10 (September 2009)
74th Philae Science Workshop
Venice, 30 March - 1 April 2009
SESAMECASSE • DIM • PP
CASSE Lab Experiments: August 2008
General Setup CASSE Piezo Source & Receiver
MUPUS-Pen Simulator
Source
84th Philae Science Workshop
Venice, 30 March - 1 April 2009
SESAMECASSE • DIM • PP
Seismic Section Visualization
CASSE Lab Experiments: Analysis
New software tools developed for evaluation
SpectrogramsSpectrograms
Trace SynchronizationTrace Synchronization
Trace StackingTrace Stacking
Bootstrap Error EstimatorsBootstrap Error Estimators
Particle Motion VisualizationParticle Motion Visualization
Poisson Numberfrom Wadati Diagrams
Poisson Numberfrom Wadati Diagrams
(synthetic example)(synthetic example)
94th Philae Science Workshop
Venice, 30 March - 1 April 2009
SESAMECASSE • DIM • PP
CASSE Lab Experiments: Results
330.9273
325.3263
319253
v [ms-1]T [K]
Air Wave Velocities
Shielding the air wave from the MUPUS-Pen simulator was not possible. We could demonstrate that the main recorded signal traveled at air sound velocity.
Future Experiments will need:• Improved mounting of MUPUS Simulator• Air wave shielding• Infinite medium (no box walls!)• Testing the influence of ground contact variation• Improved software, e.g. for synchronization
Distance from source vs. sound arrival times
104th Philae Science Workshop
Venice, 30 March - 1 April 2009
SESAMECASSE • DIM • PP SESAME Cruise Phase Operations
PC6: FM-2 upload
PC8: 1. Flywheel test, thermal calibration 1
Steins flyby: Thermal calibrationTHC2: Thermal calibration 2PC10: FM-3 upload, tests, CASSE calibration
PC12: Flywheel test, interference testsLutetia flyby: Search for IDPs
2014: Checkout, FM-4 upload?
114th Philae Science Workshop
Venice, 30 March - 1 April 2009
SESAMECASSE • DIM • PP
Operation Planning until Hibernation I
PC10 Operations• Upload flight software FM-3 (SCrOP requirement SES_4)
• CFT-4 (also test of FM-3) (SES_16)
• CASSE Calibration 2 (also test of FM-3) (SES_14)
• WOL Measurement 3 (also test of FM-3) (SES_9)
ESB3 Operations replaced by Thermal Characterization 2
(SES_10)
124th Philae Science Workshop
Venice, 30 March - 1 April 2009
SESAMECASSE • DIM • PP
Operation Planning until Hibernation II
PC12 Operations• Repeat of Flywheel Test with automatic gain setting. Flywheel
in descent mode? (SES_7) Touchdown detection possible?
• Interference Tests (SES_5)
• CASSE Calibration 3 (SES_14)
• WOL Measurement 3 (SES_9)
Lutetia Operations• Search for IDPs (SES_11) (Flight through Hill sphere)
• Thermal Calibration 3 (SES_10)
134th Philae Science Workshop
Venice, 30 March - 1 April 2009
SESAMECASSE • DIM • PP
Preview on Comet Operations: In Orbit
CASSE: Detect cometary ice-dust particles
DIM: Determine particle flow rate and direction
DIM: Determine particle properties (velocity, radius,
elastic
parameters etc.)
PP: Monitor outgassing activity
144th Philae Science Workshop
Venice, 30 March - 1 April 2009
SESAMECASSE • DIM • PP
Preview on Comet Operations: SDL
CASSE: Register landing impact => elastic / inelastic parameters
CASSE: Calibrate sound transfer via unfolded landing gear
DIM: Determine particle flow rate and direction vs. height
DIM: Determine particle properties vs. height
PP: Monitor outgassing activity
PP: Calibrate sensor properties with unfolded landing gear
154th Philae Science Workshop
Venice, 30 March - 1 April 2009
SESAMECASSE • DIM • PP
PP Calibration during Descent
Measurements of stray capacitances between cables / sensors and structure in vacuum and with the unfolded landing gear
PC8 current measurements
Induced potential variations
Parameters to be characterized during descent while still under near vaccuum conditions
164th Philae Science Workshop
Venice, 30 March - 1 April 2009
SESAMECASSE • DIM • PP
Preview on Comet Operations: FSS (+ LTS)
CASSE: Determine elastic properties of landing site
CASSE: Determine sub-surface structure with MUPUS-Pen
CASSE: Detect and locate micro-seismic events
DIM: Study the near-surface cometary particle flow
DIM: Determine particle properties
PP: Determine electrical properties of the surface
material
PP: Monitor outgassing activity
174th Philae Science Workshop
Venice, 30 March - 1 April 2009
SESAMECASSE • DIM • PP Funding and Personnel
CASSE / SESAME• Organizational changes at DLR; thermal-vacuum chambers now at DLR, Bremen
• Personnel:– DLR, PF: K. Seidensticker (PI), M. Knapmeyer (Co-I, part-time, lab and analysis),
DLR, RB-MUSC: H.-H. Fischer (Co-I, part-time, flight S/W, operation)– Univ. Köln: K. Thiel (Co-I, retired)
DIM• Funding by the Hungarian Space Office through ESA/PECS guaranteed until mid 2013 on a
yearly 9-13 k€ level; additional money requested by MPS (Lindau) from the DLR (Bonn)• Personnel:
– KFKI, AEKI: I. Apáthy (PI), A. Péter (Co-I, engineering) (both retired);A. Péter will be followed by Attila Hirn soon.
– MPS: H. Krüger (Co-I, managing scientist); will follow I. Apathy as DIM-PI– Supporting scientists: A. Juhász (Co-I, KFKI, RMKI), M. Podolak (Co-I, TAU)
PP• In-house funding for Rosetta support, external funding for special activities on application.
• Personnel (no changes):– FMI: W. Schmidt (PI)
Co-Is: ESTEC: H. Laakso, R. Trautner; CETP: M. Hamelin
184th Philae Science Workshop
Venice, 30 March - 1 April 2009
SESAMECASSE • DIM • PP On the way to 67P/C-G: Conclusions
Upgrades of flight and ground software needed for more
efficient use of hardware and telemetry
Improving analysis methods, e.g.:• CASSE: Further Lab experiments planned; analysis of
seismograms
• DIM: More precise impact model; calibrations
• PP: More calibration work
Low resources and personnel changes lengthen most activities
Delivery of drafts of the SESAME Flight Operation Plan (FOP)
and EAICD planned for the first half of 2009