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SIMBOL-X Thermal Blankets

SIMBOL-X Thermal Blankets. Collura INAF-OAPA. WHY THERMAL BLANKETS?. Formation Flying configuration. Both ends of telescope open to space. Thermal losses potentially larger than previous missions. Need for reducing the heating power and ensuring temperature uniformity. Blankets can:.

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SIMBOL-X Thermal Blankets

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  1. SIMBOL-X Thermal Blankets Collura INAF-OAPA

  2. WHY THERMAL BLANKETS? Formation Flying configuration Both ends of telescope open to space Thermal losses potentially larger than previous missions Need for reducing the heating power and ensuring temperature uniformity

  3. Blankets can: However: • Ensure thermal uniformity and stability • Reduce the heating power • Block UV/Visible light • Reduce transmission of X-rays especially at energies < 1.5 keV • Can be severely damaged by cosmic rays • Need an accurate mechanical design to survive launch shocks and an accurate calibration

  4. Eligible materials are: • Lexan with Al coating • Polyiamide with Al coating Polyiamide offers a better UV opacity and mechanical strength, but tends to change volume if it absorbs water It has been successfully employed in large unsupported filters on previous X-ray space missions (Chandra and XMM-Newton)

  5. Polyimide in previous missions • Chandra: 10x10 cm² unsupported, 6000 Å thickness, Al coated • XMM-Newton: circular 70 mm diameter unsupported 1200 Å thickness, Al coated All survived launch shock and are performing very well in orbit

  6. Baseline Design Film: Polyiamide 4000Å Coating: Al 1000 Å Both telescope ends blanketed, blankets away from telescope end, to ensure temperature uniformity Shape and size:TBD Support: double mesh sandwich???

  7. X-ray Transmission Single blanket Two blankets

  8. UV/Visible Transmission

  9. Comments If possible, unsupported design is advisable. Acoustic, thermal vacuum and shock tests must be performed to ensure survival A thinner layer of Al, if compatible with thermal requirements, would improve low energy response

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