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- W1864361999 abstract "The mechanical and optical properties of the metallized Teflon ® FEP thermal control materials on the Hubble Space Telescope (HST) have degraded over the nearly seven years the telescope has been in orbit. Given the damage to the outer layer of the multilayer insulation (MLI) blanket that was apparent during the second servicing mission (SM2), the decision was made to replace the outer layer during subsequent servicing missions. A Failure Review Board was established to investigate the damage to the MLI and identify a replacement material. The replacement material had to meet the stringent thermal requirements of the spacecraft and maintain mechanical integrity for at least ten years. Ten candidate materials were selected and exposed to ten-year HST-equivalent doses of simulated orbital environments. Samples of the candidates were exposed sequentially to lowand high-energy electrons and protons, atomic oxygen, x-ray radiation, ultraviolet radiation and thermal cycling. Following the exposures, the mechanical integrity and optical properties of the candidates were investigated using optical microscopy, scanning electron microscopy (SEM), a laboratory portable spectroreflectometer (LPSR) and a Lambda 9 spectroreflectometer. Based on the results of these simulations and analyses, the Failure Review Board selected a replacement material and two alternatives that showed the highest likelihood of providing the requisite thermal properties and surviving for ten years in orbit." @default.
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- W1864361999 date "1999-03-01" @default.
- W1864361999 modified "2023-09-23" @default.
- W1864361999 title "Ground-Based Testing of Replacement Thermal Control Materials for the Hubble Space Telescope" @default.
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- W1864361999 doi "https://doi.org/10.1088/0954-0083/11/1/006" @default.
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