Contamination evaluation and thermal vacuum bakeout for SOLAR-B visible-light and X-ray telescope

Astronomy and Astrophysics – Astronomy

Scientific paper

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X-Ray Telescopes, Solar Space Telescopes

Scientific paper

In the development of space telescopes, we are concerned about molecular outgassing materials from telescope components. In particular, for solar telescopes in space, the deposition of the outgassing materials may lead to the increase of solar absorptance at a mirror surface and it causes the thermal distortion due to the resultant temperature increase. The mirror reflectivity at vacuum ultraviolet wavelengths is very sensitive to molecular contamination. We have extensively evaluated reflectance at 121.6nm (Lyman-alpha) of the contamination witness mirrors exposed to the telescope testing environments in the SOLAR-B visible-light telescope program. Thermal vacuum bakeout of flight components is very effective process to reduce the outgassing rate. We have severe contamination control program during the assembly and testing of the SOLAR-B telescope up to launch of the satellite.

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