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Commissioning Results
Lander Experiment ROMAPLander 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
Commissioning Results
MagnetometerMagnetometer
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
Commissioning Results
Plasma MonitorPlasma Monitor
Electrostatic Analyser energy range
ions 40...8000eVelectrons 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
Commissioning Results
Sensor AccommodationSensor Accommodation
1kg inclusive boom 0.8…1.0Watt depending on mode
Commissioning Results
SI: Fluxgate Magnetometer (FGM)SI: Fluxgate Magnetometer (FGM)
THEMIS/SITE VISIT SI-15 UCB, 01/28/2003
Karl Heinz Glassmeier, TU-BSin 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 OrbiterRosetta Lander, Venus Express
Commissioning Results
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
SI: Fluxgate Magnetometer (FGM)SI: Fluxgate Magnetometer (FGM)
Mass < 50gr
Volume 5x5x4cm3
Commissioning Results
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
SI: Fluxgate Magnetometer (FGM)SI: Fluxgate Magnetometer (FGM)
DAC
IDPU
Sensor
ADC
FPGA
feedback
sense excitation
Commissioning Results
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
THEMIS/SITE VISIT SI-18 UCB, 01/28/2003
SI: Fluxgate Magnetometer (FGM)SI: Fluxgate Magnetometer (FGM)
Cluster, Equator-SRosetta O. & L. Oerstedt, ChampCassini, GiottoAmpte, HeliosFreja, DS1 ...