Download ppt - Ganymede Lander Page 1 - Magnetometer Proposal -Moscow, 2013-03-06 Magnetic Field Measurement Onboard a Ganymede Lander Experiment Proposal Based on Experiences

Ganymede Lander

Page 1 - Magnetometer Proposal -

Moscow, 2013-03-06

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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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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Lander Contribution to investigate intrinsic fields

Decay of field during descentCourtesy Ben Weiss

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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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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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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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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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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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Digital Fluxgate – Simple and Robust

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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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L-DEPP on Lunar Lander (ESA concept study)



Data interface

Power interface

ADC

DAC

ADC

DAC

Excitation

Measuring dB/dt

Feedback

Voltage

Current

measurement

Sweep

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Proposal for Ganymed Lander (e.g. a combined B/E field experiment)



Data interface

Power interface

ADC

DAC

ADC

DAC

Excitation

Measuring dB/dt

Feedback

active

E-field

measurement

Stimulation

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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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Heritage

MascotRosetta

Mars 96Lander and Balloon

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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