Magnetism of Ganymede Environmental Conditions on Ganymede Magnetic field measurement on a Lander
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Transcript of Magnetism of Ganymede Environmental Conditions on Ganymede Magnetic field measurement on a Lander
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Ganymede Lander
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Magnetic Field Measurement Onboard a Ganymede Lander
Experiment Proposal Based on Experiences with Lander Magnetometers for the Missions Mars 96/98, Rosetta
and Hayabusa-2
Uli Auster & Karl Heinz Glaßmeier for the JUICE J-MAG Team(TU-BS Germany, IWF Austria and IC UK)
Magnetism of Ganymede
Environmental Conditions on Ganymede
Magnetic field measurement on a Lander
Summary
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Ganymede Lander
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Magnetic Field at Ganymede
Scientific Objective Expected Signal
Intrinsic dynamo field 1400nT at poles
Jovian magnetospheric field at Ganymede’s orbital distance +/-100nT
Ganymeds magnetospheric and plasma interaction signal +/- 180nT
Induced signal at 500km altitude, ocean 38nT @ T= 10,5hours0.7nT @ T= 171hours0.6nT @ T= 27days
Induced signal core (w/o ocean) 3.2nT @ T= 10,5hours
Courtesy of Jia and Kivelson
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Ganymede Lander
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Lander Contribution to investigate intrinsic fields
Decay of field during descentCourtesy Ben Weiss
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Ganymede Lander
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Lander Contribution to investigate induced fields
Induced Signal in dependency on source region
100 200 300 400 500 600 700 800 900 1000
[altitute in km]
2
4
6
8
[nT
]
@ JUICE Orbit
@ Ganymede surface
-100km
-200km
-500km
-1000km
Ocean at
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Ganymede Lander
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Condition at Ganymed
Environmental Conditions on Ganymed: Cold and high Radiations
Recent work for JUICE might solve some problems.
Temperature: Test facilities have been refurbished for tests and calibration in a wide temperature range
Radiation: Tolerant electronics is needed, Hybrids (ITAR free) for AD and DA conversion have been developed
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Ganymede Lander
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Test Facilities
Magnetsrode near Braunschweig IWF Graz
Graz: zero levels, noise density and transfer function at temperature range of +/-150°C
Magnetsrode: scale values, linearity and orthogonality from -190°C to +180°C
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Ganymede Lander
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Radiation tolerant electronics
Radiation tolerant Hybrids (ITAR free) for AD and DA conversion
AD-Converter DA Converter
AD converter with preamplifier and latch up protection
Two cascaded DA converter with sum-up and current source option
Resolution 18bit, 1MHz Resolution 16 bit each
Power consumption 40mW + 25mW Power consumption 60mW
Input Noise: 2nV/Sqrt(Hz) Non Linearity: <5 x 10-5
Tested (on die) up to 30krad Tested (on die) up to 60krad
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Ganymede Lander
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Radiation tolerant electronics
Design of Shielding
Shielding Factor
Massg/cm²
Thickness of Zlow layer µm
Al-Ta 11,06 1,88 731,00
Al-W 12,27 2,05 750,00
Al-WCu 10,90 1,82 700,00
Ti-Ta 11,91 1,99 850,00
Ti-W 13,00 2,14 780,00
Ti-WCu 12,76 2,09 600,00
Simulation with Mulassis (SPENVIS)
Courtesy of Evelyn Liebert
Truscott et al., 2010
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Ganymede Lander
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Digital Fluxgate – Simple and Robust
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Ganymede Lander
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Common Electronics & Combination of Sensors
Romap on Rosetta Lander (landing on Comet CG in 2014)
Data processing in FPGA
Controlling of AD and DA conversion Calculating of physical units Pre-calibration Packaging Timing HK processing
Data interface
Power interface
ADC
DAC
ADC
DAC
Excitation
Measuring dB/dt
Feedback
HighVoltage
Current
measurement
Control
Counting
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Ganymede Lander
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Common Electronics & Combination of Sensors
L-DEPP on Lunar Lander (ESA concept study)
Data processing in FPGA
Controlling of AD and DA conversion Calculating of physical units Pre-calibration Packaging Timing HK processing
Data interface
Power interface
ADC
DAC
ADC
DAC
Excitation
Measuring dB/dt
Feedback
Voltage
Current
measurement
Sweep
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Ganymede Lander
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Common Electronics & Combination of Sensors
Proposal for Ganymed Lander (e.g. a combined B/E field experiment)
Data processing in FPGA
Controlling of AD and DA conversion Calculating of physical units Pre-calibration Packaging Timing HK processing
Data interface
Power interface
ADC
DAC
ADC
DAC
Excitation
Measuring dB/dt
Feedback
active
E-field
measurement
Stimulation
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Ganymede Lander
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Resources
Experiment / Mission (Year of Development)
Power(W)
Mass(g) sensor / boom / electr.
Range / resolution(nT)
Optimism / Mars 96 (1994) 0,2 (w/o DPU) 115 / 180 / 105 8 000 / 0,250
Magibal / Mars 98 (1996) 1,0 400g (2 sensors, boom) 2 000 / 0,025
Romap / Rosetta (2002) 0,9 50 / 120 / 200 2 000 / 0,010
L-DEPP / Lunar Lander (2012) 0,8 50 / 400 / 150 60 000 / 0,008
Mascot / Hayabusa II (2013) 0,8 50 / ---- / 150 60 000 / 0,008
… / Ganymede Lander (2020) 0,8 50 / ??? / 200 60 000 / 0,008
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Ganymede Lander
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Heritage
MascotRosetta
Mars 96Lander and Balloon
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Ganymede Lander
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Summary
Magnetometer on Lander – in combination with J-MAG on JUICE Can improve science output significantly Particularly for characterisation of internal field and induced field components
Temperature conditions and high radiation dose can be handled. Facilities for testing at extreme low temperatures exist in Brauschweig and Graz Radiation tolerant hybrids have been developed for use up to 300-700krad ADC and DAC parts might be of interest even for other experiments
TU-BS has a long Heritage with Lander magnetometers First steps were done together with IKI and IZMERAN colleagues for Mars 96. Currently two Lander magnetometers are on the way (Rosetta & Hayabusa II) Possible synergy with JUICE magnetometer in hardware and science