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: ROMAP Mag electronics:
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 Faraday Cup energy range
ions eV
electrons eV
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
Mass
< 50gr
Volume
5x5x4cm3
THEMIS/SITE VISIT SI-16 UCB, 01/28/2003

7. 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 pT resolution also close to Earth no range switching anymore
DAC
IDPU
Sensor
ADC
FPGA
feedback
sense
excitation
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