Thermal design and test verification of the solar X-Ray and extreme ultraviolet imager

This paper describes a detailed thermal design scheme to ensure the low-temperature detection requirements of the solar X-ray and extreme ultraviolet imager (XEUVI) under complex external heat flux conditions. First, the structure, working mode and internal heat sources of the imager are introduced. Second, the thermal design scheme is proposed with a combination of active and passive thermal controls. Finally, a thermal balance test of XEUVI was performed in a vacuum environment. The test results showed that the CCD temperature ranged from -65.6 degrees C to -56.3 degrees C, the optical system temperature ranged from 12.9 degrees C to 22.0 degrees C, the frame temperature ranged from -4.6 degrees C to 20.3 degrees C, the motor temperature ranged from 1.0 degrees C to 19.8 degrees C, and the electrical box temperature ranged from -2 degrees C to 38.8 degrees C. The results of testing meet the requirements of the thermal control indices, and the thermal balance test verifies the correctness of the thermal design.