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Radio & Plasma Wave Instrument (RPWI) Team Meeting

Radio & Plasma Wave Instrument (RPWI) Team Meeting. RPWI Documentation Twiki home page (secure) http://space.irfu.se/twiki/bin/view Register! JgoRpwi group Only IRF-Uppsala team members can edit (may change) All RPWI documentation will by time be stored here

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Radio & Plasma Wave Instrument (RPWI) Team Meeting

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  1. Radio & Plasma Wave Instrument (RPWI) Team Meeting • RPWI Documentation • Twiki home page (secure) • http://space.irfu.se/twiki/bin/view • Register! • JgoRpwi group • Only IRF-Uppsala team members can edit (may change) • All RPWI documentation will by time be stored here • RPWI Public Outreach page Who? Jan-Erik Wahlund, RPWI Meeting (Prague), Feb. 18-19, 2010

  2. ESA EJSM WS

  3. EJSM/JGO S/C(EJSM WS, January, 2010) • Mass: • Incl. 20% system design • Dry: ≈1500 kg, Total: 4400 kg • P/L: 104 kg (incl. margin), 120-150 W • Power: • GaAs cells >60 m2 • Notes: • High Temp MLI on S/C external surface during Venus flybys • Nadir pointing during flybys, except during communication periods • TM: • Ka band • Ganymede circular phase most constraining, > 1 Gbit/day

  4. EJSM project schedule

  5. EJSM/JGO Mission Profile • Launch: 2020 (to sync with JEO) • Arrival: 2026 with a VEEGA • Cruise: 6 years • JOI: A Ganymede GA before JOI • 13 x 230 RJ orbit • 165 +120 days, Δv ≈ 887 m/s • Callisto Science Phase (57+400 days) • Resonant orbit with Callisto (15 flybys) • Both poles, 2.5-2.6 km/s • Ganymede approach & orbit phase • To Ganymede orbit with CaGaGa-GA (85 days) • All flybys near 200 km • Elliptical Orbit: 200 x 10000 km, 141.8° (120 days) leading to 1000 km near circular orbit at end • Cicular Orbit: 200 km (180 days) • 1h eclipses foreseen • Impact Ganymede

  6. P/L Operations

  7. SSR antenna use (RA-PWI) • Agreement for passive use • With Lorenzo Bruzzone (SSR lead) • Details to be settled March 11, Trento

  8. Radiation issues • Design requirement (new!) • 85 krad behind 10 mm Al • Design should aim for 150 krad tolerance • Concern: Requirement keep changing • Shielding mass • ESA estimates 80 kg shielding for 104 kg P/L (confirmed) • ≈ 3 kg for RPWI • Radiation control • ESA will most probably implement a Radiation Control Board • Suggestion: L. Åhlén from RPWI

  9. Radiation test facilities • in Uppsala • Co60 1-10 Rad/min • Electrons, 7.5-15 MeV High dose rate • Protons, 20-180 MeV 150 Rad/min • Protons, < 6 MeV Low dose rate • Heavy ions

  10. Planetary Protection

  11. JGO Requirements • COSPAR • Maintains a planetary protection policy • Has a dedicated planetary protection panel • ESA & NASA • Has planetary protection policies compliant with COSPAR • Mission lead agency has overall responsibility (ESA for JGO)

  12. Category II: Of significant interest relative to the process of chemical evolution & origin of life, but only remote chance that contamination by S/C could compromise future investigations.

  13. Procedures for Category II • ESA may consider bio-burden control for H/W • Dry heat microbial reduction (DHMR)? • Only penetrator (if selected)? • Recommended scope for bio-burden control • Assembly, testing and launch in ISO 8 clean-room condition • Transport in clean boxes in between • Perform biological assays during H/W final assembly • Assess temperature/time profiles of manufacturing processes, especially for items behind radiation shielding • 5h at 125°C reduce by an order of magnitude • Use test program & approved parts list • Estimate reduction based on agreed bio-burden levels, inactivation rate and S/C radiation dose mapping

  14. Documentation/Reviews RPWI probably need a dedicated person for Planetary Protection Control Who?

  15. Again for RPWI: Who?

  16. Funding situation (IRF-Uppsala + KTH) • February 1: Applied for two years to SNSB • TDA:s as well as Management • LP-PWI mechanics • Radiation facilities upgrade • Radiation testing • ASIC development activities • MEMS WLP pre-amps for LP-PWI • Planetary protection activities • Cost outlined until 2030 (!)

  17. LP-PWI pre-amps development • MEMS Wafer Level Packaged (WLP) technlogy • 5x5x1 mm3, 1g, 10g with 8 mm shielding • Compare PCB, 3x5x2 cm2, 300g with 8 mm shielding • 4 units means ≈ 1.2 kg mass saving • Ångström Microtech AB • MEMS WLP is TRL 6 • No problem reach TRL 5 pre-amps by end of 2012 • Could also be applied to HF pre-amps if wanted

  18. Pre-amp house (LP-PWI) From M. Dobrowolski & J. Grgorczuk (Warzaw)

  19. HF Receiver /Analyzer

  20. HF Rx/Analyzer • Iowa University group is prime • IRFU is looking into how LESIA may participate • Sorry, cannot say more for the moment.

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