Molecular Contamination Assessment on Hinode Optical Telescope Assembly

Abstract

The Hinode (Solar-B) Optical Telescope Assembly (OTA) is sensitive to molecular contaminant deposition resulting from its organic materials outgassing on orbit. It was launched by M-V rocket on 22 September 2006 UT. The Hinode telemetry data showed that temperature of the Heat Dump Mirror (HDM) rose rapidly during first two months. This is attributed to the fact that molecular contamination deposition degrades a solar absorptance of the HDM. Each numerical analysis result for the Primary Mirror (M1) and the Secondary Mirror (M2) corresponded with a change in solar absorptance, delta alpha, converted temperature data into. The numerical analysis result for the HDM was less than delta alpha. It is necessary to take into account desorption and temperature-dependent outgassing on the numerical analyses.