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Lander Experiment ROMAP

Lander Experiment ROMAP. Experiment Overview ROMAP Magnetometer Electrostatic Analyser Pressure Sensors Commissioning Results Functionality, Anomalies Spacecraft / Lander Disturbances Common Measurement Sept. 08/09 RPC Mag - ROMAP Why & when common measurements. Magnetometer.

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Lander Experiment ROMAP

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  1. Lander Experiment ROMAP • Experiment Overview ROMAP • Magnetometer • Electrostatic Analyser • Pressure Sensors • Commissioning Results • Functionality, Anomalies • Spacecraft / Lander Disturbances • Common Measurement Sept. 08/09 • RPC Mag - ROMAP • Why & when common measurements

  2. Magnetometer ROMAP & RPC fluxgate sensors: • Both are vector compensated ringcore sensors • RPC: Coils on ceramics, feedback and sense using the same coil system • ROMAP: Cu wire covered by bond coat, feedback separated from sense coils • ROMAP sensor two times larger in diameter ROMAP Mag electronics: • Digital fluxgate electronics (sensor ac signal digitised by 40kHz, pre-processing in FPGA) ROMAP Mag parameters: • Range 2000nT • Resolution 0.005nT

  3. Plasma Monitor • Electrostatic Analyser • energy range ions 40...8000eV electrons 0.3...4200eV • energy steps 32 / 64 • exp. time 40ms...1s • Faraday Cup • integral energy distribution up to 2000eV • energy steps 64 • range 5x10-12 – 4x10-10 A

  4. Sensor Accommodation • 1kg inclusive boom • 0.8…1.0Watt depending on mode

  5. SI: Fluxgate Magnetometer (FGM) Karl Heinz Glassmeier, TU-BS in co-operation with IWF-Graz • PI of the ROSETTA Magnetometer • Co-I of the GIOTTO Mission and on the magnetometer teams for CLUSTER, FREJA and CASSINI missions • Research interest and experience in data analysis and theory of space plasma physics and solar system physics in general • About 150 publications in space science Equator-S, Double Star, DS1, Rosetta Orbiter Rosetta Lander, Venus Express THEMIS/SITE VISIT SI-15 UCB, 01/28/2003

  6. SI: Fluxgate Magnetometer (FGM) Fluxgate Sensor • Ringcore Technology • Developed since 1983 by several German institutes and companies • Noise < 10pT/Sqrt(Hz) • Offset stability < 2nT/year • Vector compensating Helmholtz System • No transverse field dependency • Orientation of magnetic axis depends on feedback coil system only • No support material like ceramics: low weight & temp. dependence of scale value depends on one material THEMIS/SITE VISIT SI-16 UCB, 01/28/2003

  7. IDPU sense excitation feedback DAC ADC Sensor FPGA SI: Fluxgate Magnetometer (FGM) Digital Fluxgate Electronics • Heritage / Reliability • Developed in Germany since 1991 • Tested worldwide in observatories (high precision) and applied physics (robustness) • First space application onboard the MIR, actually prepared for ESA’s Rosetta and Venus Express missions • Advantages • Digitization close to sensor very limited number of analogue components • Very large dynamic range 10pT resolution also close to Earth no range switching anymore THEMIS/SITE VISIT SI-17 UCB, 01/28/2003

  8. SI: Fluxgate Magnetometer (FGM) Test & Calibration • Preflight • All magnetometers will be tested under various environmental conditions (B,) • Large number of facilities exist in Europe (Magnetsrode, Niemegk, Graz…) • Additionally a test facility (similar to that in Graz) will be installed in Berkeley • Inflight • preprocessing and calibration software for Cluster and Equator-S was developed in Braunschweig and Graz • Personal (E.Georgescu, K.H.Fornacon) is available after Cluster • Cluster, Equator-S • Rosetta O. & L. • Oerstedt, Champ • Cassini, Giotto • Ampte, Helios • Freja, DS1 ... THEMIS/SITE VISIT SI-18 UCB, 01/28/2003

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