Fig. 1. Assembly of primary mirror

Fig. 2. Heat transfer model of end face of primary mirror assembly

Fig. 3. Thermal simulation model diagram of quartz primary mirror

Fig. 4. Mesh division

Fig. 5. Simulation diagram of temperature distribution of mirror frame and primary mirror

Fig. 6. Thermal simulation model diagram of SiC primary mirror

Fig. 7. Mesh division

Fig. 8. Simulation diagram of temperature distribution of SiC primary mirror

Fig. 9. Thermal optical test site of primary mirror

Fig. 10. Comparison of measured and simulated temperatures

Fig. 11. Temperature gradient and RMS of quartz primary mirror

Fig. 12. Layout of local thermal control optimization of primary mirror assembly

Fig. 13. Simulation diagram of optimized temperature distribution

Fig. 14. Optimized thermal optical test of primary mirror

Fig. 15. Comparison of measured and simulated temperature

Fig. 16. Thermal control optimization effect at heating power of 32 W