1. CITYFLUX – Filter Sample (J Floor)

2. A B C D

3. A Foam damage

4. a b c 10um

5. a b c b a c

6. before after

7. Foam damage

8. A B C D

9. B

10. Foam damage in progress – 3 images taken over 20 seconds

11. a b c

12. a b c a b c

13. Images after Foam damage

14. A B C D

15. a b c d C

16. a b c d

17. Images after

18. A B C D

19. D 1 2 3

20. a b c 1

21. Foam damage – images taken over 15 seconds

22. a b c a b c

23. Image before/after Before After

24. D 1 2 3

25. 2 a b c d e 2

26. a b c d e e d b c a

27. Particle flipped over Damage by beam Before After

28. D 1 2 3

29. a b c d f e 3

30. a b c d f e ba c e d f

31. After image

32. Overview after investigation, Extensive beam damage

33. Particle sizes: All less than ~10um, most <2um Particle Composition – Carbon or silicate material