Development of Thermal Vacuum Test Facility for The Large Optical Payloads of HEO Satellites

Athermal vacuum test facility,named Y1H,was developed by Shanghai Institute of Spacecraft Equipment,to meet the thermal test requirement of large optical payloads of HEO satellites.The Y1H facility has a φ2m solar simulator,which is the largest collimation solar simulator of China in space environment.Y1H includes two chambers with a horizontal combination structure,and the effective size of the main chamber is φ6m×6.5 m.The ultimate vacuum is better than 3×10^-5Pa,and the temperature of thermal shroud is better than 100 K.This paper briefly introduces technical specifications and structure configuration of the Y1H facility.