Fig. 1. Experimental setup for surface contamination of reflector removal by air knife sweeping and its flow chart

Fig. 2. Boundary model of surface contamination of reflector removal by air knife sweeping

Fig. 3. Removal ratio vs. deflection angle of air knife for different contamination types

Fig. 4. Removal ratio vs. the installation height of the air knife for different contamination types

Fig. 5. Particles contamination diameter distribution on the reflector surface

Fig. 6. Maintenance of reflector surface particle cleanliness before and after online sweeping, 1#2#3#4# stand for four reflectors separately

Fig. 7. Long-term maintenance of reflector surface particle cleanliness