1. CS to brick and track follow-up ● Cosmic ray test ● CS scanning ● CS to brick connection ● Track following Napoli Scanning Lab

2. Cosmic ray test performed in November ● Brick with CS brought out of the gallery ● Kept for about 4 minutes at the surface ● Integrating about 100 tracks on the whole surface ● Going back to the underground lab ● Attach a second CS doublet and expose to cosmic rays in the pit for 24 hours CS doublet Cosmic rays

3. Scanning of the cosmic-ray test bricks ● CS doublets (European part) were scanned at Gran Sasso ● After the first area scanning performed at Gran Sasso, one CSD was sent to Naples ● Enlarged the statistics (all the surface) ● CSD scanning and results ● CS to brick connection ● Brick scan-back

4. Scanning station for 6 bricks CS1 and CS2 scanning: ● minimum number of grains = 7 ● “expansion” filter ● fixed cutoffs ● 15 layers Up/down linking: ● minimum number of grains = 7 ● Delta X,Y = 30 µm ● Delta TX,TY = 40*(1+4* ) mrad CS1/CS2 tracking ● Delta X,Y = 40 µm ● Delta TX,TY = 25 mrad ● N = N CS1 + N CS2 = 40 grains ● quality cut: SIGMA < N * 0.13 - 1.3 Napoli laboratory: brick #973 CS1 and CS2 scanning: ● minimum number of grains = 7 ● “expansion” filter ● cut-offs tuned on the CS2 ● 16 layers Candidates in the CS sheets: ● Delta X,Y = 120 µm ● Delta TX,TY = 50 mrad

5. CS1 and CS2 scanning

6. SIGMA0 1 6. 6..010.010 # sigmaX sigmaY sigmaTX sigmaTY DEGRAD 1 4# angular degradation: sig(tx) = sig(0)*(1+deg*tx) BINS 1 5 5 5 5# bin*sigma = acceptance CHI2MAX 13.5# chi2 simple CHI2PMAX 13.5# chi2 with puls weighting (ramp used) Up/down linking parameters: building the base-tracks CHI2MODE 0 3 SIGMA0 0 40. 40..005.005 DEGRAD 0 4. BINS 0 3 3 5 5 CHI2MAX 05.5 CHI2PMAX 05.5 CS1/CS2 tracking parameters: building the doublet tracks  xy= 40µm  3  cut  txty = 5mrad  5  cut  degrading with the track slope  xy= 6µm  5  cut  txty = 10mrad  5  cut  degrading with the track slope

7. CS1-to-CS2 alignment with data scanned at Gran Sasso Candidates for 6 european bricks 109 (102 with grains>=40) events in 16*6 = 96 cm 2 6x5=30µm3.4x5=17µm 5x5=25mrad 40 grains  x = 6µm  tx = 5mrad

8. CS1-to-CS2 alignment for brick 3000973 Candidates: 93 (79 with grains>=42) events in 96 cm 2 (8.6x11.1cm2)  x = 15µm  y = 4µm  tx = 4mrad  ty = 4mrad 42 grains

9. Y residuals vs. X and Y position Y CS2 - Y CS1 - TY CS1 *300 Y (µm)X (µm)

10. X residuals vs. X and Y position X (µm) Y (µm) X CS2 - X CS1 - TX CS1 *300 12 cm 10 cm

11. X residuals vs. X and Y position (2D view) mark #1 mark #2 mark #3mark #4 30 µm offset

12. Summary of CS to CS connection ● After a cut on the number of grains (42 out of 64) 74 tracks remained  predicted onto the brick after the extrapolation of 4700 µm Position distributionAngle distribution

13. Data quality of films inside the brick high fog (>=10/1000 µm 3 ) and Compton Micro-tracks per view Clusters per view 3 inter-calibration areas 1cm2 ~500 base-tracks/mm2 ( <0.5) after quality cut ~15/mm2

14. Measured gap between CS and brick 4450 µm measured value (4700 µm nominal) 220 µm correction 270 µm correction

15. CS to brick connection position accuracy  = 70µm  = 54µm 12 cm  x (µm) finding rate  = 47/74 = (64±6)%

16. CS to brick connection angular accuracy  = 9mrad  = 12mrad

17. CS to brick connection position and angular distribution of candidates validated by manual check 12 cm 9 cm

18. Connection of plate 1 to 2 position accuracy all candidates validated by manual check  x = 16µm  y = 12µm  = 41/47 = (87±5)%

19. Connection of plate 1 to 2 angular accuracy all candidates validated by manual check  tx = 8.6mrad  ty = 7.9mrad

20. Connection of plate 2 to 3: position accuracy all candidates validated by manual check  tx = 7mrad  tx = 6.4mrad  y = 8µm  x = 13µm  = 39/41 = (95±3)%

21. Conclusions ● 74 tracks found on the CS doublet (~ 96 cm 2 ) but not manually checked ● Position dependence of the X offsets ● High fog density (10/1000 µm 3 ) on the films inside the brick ● 47 tracks found in the first plate of the brick and manually confirmed ● 65% of connecting efficiency (physics, instrumental, etc.) ● 41 tracks found on the second plate (manually confirmed) ● 39 tracks found on the third plate (manually confirmed)