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CS to brick and track follow-up

CS to brick and track follow-up. Cosmic ray test CS scanning CS to brick connection Track following. Napoli Scanning Lab. Cosmic ray test performed in November. Cosmic rays. Brick with CS brought out of the gallery Kept for about 4 minutes at the surface

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CS to brick and track follow-up

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  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 Cosmic rays • 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

  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 Napoli laboratory: brick #973 CS1 and CS2 scanning: • minimum number of grains = 7 • “expansion” filter • fixed cutoffs • 15 layers CS1 and CS2 scanning: • minimum number of grains = 7 • “expansion” filter • cut-offs tuned on the CS2 • 16 layers Up/down linking: • minimum number of grains = 7 • Delta X,Y = 30 µm • Delta TX,TY = 40*(1+4*) mrad Candidates in the CS sheets: • Delta X,Y = 120 µm • Delta TX,TY = 50 mrad CS1/CS2 tracking • Delta X,Y = 40 µm • Delta TX,TY = 25 mrad • N = NCS1 + NCS2 = 40 grains • quality cut: SIGMA < N * 0.13 - 1.3

  5. CS1 and CS2 scanning

  6. Up/down linking parameters: building the base-tracks 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 1 3.5 # chi2 simple CHI2PMAX 1 3.5 # chi2 with puls weighting (ramp used) • xy= 6µm  5 cut • txty = 10mrad  5 cut • degrading with the track slope CS1/CS2 tracking parameters: building the doublet tracks CHI2MODE 0 3 SIGMA0 0 40. 40. .005 .005 DEGRAD 0 4. BINS 0 3 3 5 5 CHI2MAX 0 5.5 CHI2PMAX 0 5.5 • xy= 40µm  3 cut • txty = 5mrad  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 cm2 x = 6µm 6x5=30µm 3.4x5=17µm tx = 5mrad 5x5=25mrad 5x5=25mrad 40 grains

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

  9. Y residuals vs. X and Y position YCS2 - YCS1 - TYCS1*300 X (µm) Y (µm)

  10. X residuals vs. X and Y position XCS2 - XCS1 - TXCS1*300 12 cm 10 cm Y (µm) X (µm)

  11. X residuals vs. X and Y position (2D view) mark #4 mark #3 mark #2 mark #1 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 distribution Angle distribution

  13. Data quality of films inside the brickhigh fog (>=10/1000 µm3) and Compton Micro-tracks per view Clusters per view ~500 base-tracks/mm2 (<0.5) after quality cut ~15/mm2 3 inter-calibration areas 1cm2

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

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

  16. CS to brick connectionangular accuracy  = 9mrad  = 12mrad

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

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

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

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

  21. Conclusions • 74 tracks found on the CS doublet (~ 96 cm2) but not manually checked • Position dependence of the X offsets • High fog density (10/1000 µm3) 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)

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