An in-orbit Thermal Design of Optical Window in Space Solar Telescope

A complex space environment will influence a space solar telescope during its in-orbit operation, and the temperature change of the optical window will affect directly the imaging quality of the optical system behind it. The purpose of the thermal design is to ensure that all the parts of the optical window keep their temperature in a normal range, more importantly, to ensure that the window can rapidly return to its working state as soon as the Earth shadowing is ended, and to complete the operation in a whole period. In order to obtain the temperature distribution and the temperature variation of the window under the space thermal load in the whole period, we have made the steady-state simulation analysis and transient-state simulation analysis of the window with and without heating during the Earth-shadow time. A good thermal control result is obtained by comparing the two kinds of transient state simulation results of the temperature distribution, and by accordingly taking the appropriate thermal control measures on the window.