1. LED SYSTEMATICS IN TRANSMISSION LENGTH MEASUREMENTS Harold Yepes-Ramirez 15/11/2011

2. STRATEGY: Comparison of transmission length measurements and number of hits as a function of the distance for neighboring lines by OB faces, in order to see which line collects the largest amount of signal, probably the candidate to measure, this to reduce the shadowing effect. Lines 4 and 2 multi-faces runs (f1, f2, f3, f4, f5, f6 respectively): L2: 52693, 52696, 52698, 52700, 52702, 52704. L4: 36035, 36041, 36043, 36044, 36045, 36047. L2 run with large statistics (1M events): 44552. New consideration to define the minimum and the maximum distance to fit: Rmin  The storey where Nhits/Nflashes < 0.10 (mean value of the OMs). Rmax  Rmin + 6 storeys. Links to all plots in the conclusions section.

3. SAME FACES DIFFERENT TARGET LINES: L4 MULTI-FACES RUNS

4. Largest amount of data for f1 on L4. L1 and L2 seems to collect the same amount of light from 125 m, where the fits normally start. The same is seen for L3 and L6. L8 and L10 are the more distant lines, transmission length in L8 slightly differ concerning to other target lines. L10 signal is not collected, only noise not well selected as signal is registered (time distributions in next pages).

5. TIME DISTRIBUTIONS: l4_f1_tl1 TIME DISTRIBUTIONS DELAYED 500 NS????

6. TIME DISTRIBUTIONS: l4_f1_tl2 TIME DISTRIBUTIONS DELAYED 500 NS????

7. TIME DISTRIBUTIONS: l4_f1_tl3 TIME DISTRIBUTIONS DELAYED 500 NS????

8. TIME DISTRIBUTIONS: l4_f1_tl6 TIME DISTRIBUTIONS DELAYED 500 NS????

9. TIME DISTRIBUTIONS: l4_f1_tl7 TIME DISTRIBUTIONS DELAYED 500 NS????

10. TIME DISTRIBUTIONS: l4_f1_tl8 TIME DISTRIBUTIONS DELAYED 500 NS????

11. TIME DISTRIBUTIONS: l4_f1_tl10 ONLY NOISE IS COLLECTED.

12. Largest amount of data for f2 on L2. L1 and L2 seems to collect the same amount of light from 125 m, where the fits normally start. The same is seen for L3, L6 and L8 (but L is the lowest value among them but compatible with the one for the line which collects the largest amount of data). L10 is only noise.

13. TIME DISTRIBUTIONS: l4_f2_tl1

14. TIME DISTRIBUTIONS: l4_f2_tl2

15. TIME DISTRIBUTIONS: l4_f2_tl3

16. TIME DISTRIBUTIONS: l4_f2_tl6

17. TIME DISTRIBUTIONS: l4_f2_tl7

18. TIME DISTRIBUTIONS: l4_f2_tl8

19. TIME DISTRIBUTIONS: l4_f2_tl10

20. Largest amount of data for f3 on L8. L1, L2, L3 and L6 seems to collect the same amount of light from 125 m. Values for L slightly differ among them. L10 is only noise.

21. TIME DISTRIBUTIONS: l4_f3_tl1

22. TIME DISTRIBUTIONS: l4_f3_tl2

23. TIME DISTRIBUTIONS: l4_f3_tl3

24. TIME DISTRIBUTIONS: l4_f3_tl6

25. TIME DISTRIBUTIONS: l4_f3_tl7

26. TIME DISTRIBUTIONS: l4_f3_tl8

27. TIME DISTRIBUTIONS: l4_f3_tl10

28. Largest amount of data for f4 on L6, L8, compatible results for L. L1, L2 and L3 seems to collect the same amount of light from 100 m. Values for L slightly differ among them. L10 is only noise.

29. TIME DISTRIBUTIONS: l4_f4_tl1

30. TIME DISTRIBUTIONS: l4_f4_tl2

31. TIME DISTRIBUTIONS: l4_f4_tl3

32. TIME DISTRIBUTIONS: l4_f4_tl6

33. TIME DISTRIBUTIONS: l4_f4_tl7

34. TIME DISTRIBUTIONS: l4_f4_tl8

35. TIME DISTRIBUTIONS: l4_f4_tl10

36. Largest amount of data for f5 on L6, L2, compatible results for L. L10 is only noise.

37. TIME DISTRIBUTIONS: l4_f5_tl1

38. TIME DISTRIBUTIONS: l4_f5_tl2

39. TIME DISTRIBUTIONS: l4_f5_tl3

40. TIME DISTRIBUTIONS: l4_f5_tl6

41. TIME DISTRIBUTIONS: l4_f5_tl7

42. TIME DISTRIBUTIONS: l4_f5_tl8

43. TIME DISTRIBUTIONS: l4_f5_tl10

44. Largest amount of data for f6 on L6, L2, compatible results for L. L10 is only noise.

45. TIME DISTRIBUTIONS: l4_f6_tl1

46. TIME DISTRIBUTIONS: l4_f6_tl2

47. TIME DISTRIBUTIONS: l4_f6_tl3

48. TIME DISTRIBUTIONS: l4_f6_tl6

49. TIME DISTRIBUTIONS: l4_f6_tl7

50. TIME DISTRIBUTIONS: l4_f6_tl8

51. TIME DISTRIBUTIONS: l4_f6_tl10

52. SAME TARGET LINE FOR DIFFERENT FACES: L4 MULTI-FACES RUNS

53. The amount of light collected in a same target line due to different LEDs in the OB can differs up to 63 %. This change in the amount of light has an impact on the value of L and its error, this in target line L1.

54. The amount of light collected in a same target line due to different LEDs in the OB can differs up to 50 % in the fit region. This change in the amount of light has an impact on the value of L and its error, this in target line L2.

55. The amount of light collected in a same target line due to different LEDs in the OB can differs up to 50 %. This change in the amount of light has an impact on the value of L and its error, this in target line L3.

56. The amount of light collected in a same target line due to different LEDs in the OB can differs up to 40 %. This change in the amount of light has an impact on the value of L and its error, this in target line L6.

57. The amount of light collected in a same target line due to different LEDs in the OB can differs up to 80 %. This change in the amount of light has an impact on the value of L and its error, this in target line L8, largest changes in L for too distant lines.

58. Noise, bad selected as signal hits.

59. SAME FACES DIFFERENT TARGET LINES: L2 MULTI-FACES RUNS

60. Largest amount of data for f1 on L1, in the fit region. L3 and L4 seems to collect the same amount of light from 125 m, where the fits normally start.

61. TIME DISTRIBUTIONS: l2_f1_tl1

62. TIME DISTRIBUTIONS: l2_f1_tl3

63. TIME DISTRIBUTIONS: l2_f1_tl4

64. Largest amount of signal for f2 on L3, in the fit region, low value of L and low error.

65. TIME DISTRIBUTIONS: l2_f2_tl1

66. TIME DISTRIBUTIONS: l2_f2_tl3

67. TIME DISTRIBUTIONS: l2_f2_tl4

68. Largest amount of signal for f3 on L3 and L4, in the fit region, compatible values of L, but large errors.

69. TIME DISTRIBUTIONS: l2_f3_tl1

70. TIME DISTRIBUTIONS: l2_f3_tl3

71. TIME DISTRIBUTIONS: l2_f3_tl4

72. Largest amount of signal for f4 on L3 and L4, in the fit region, non-compatible values of L, but errors decrease.

73. TIME DISTRIBUTIONS: l2_f4_tl1

74. TIME DISTRIBUTIONS: l2_f4_tl3

75. TIME DISTRIBUTIONS: l2_f4_tl4

76. Largest amount of signal for f5 on L3 and L4, in the fit region, non-compatible values of L, errors increase.

77. TIME DISTRIBUTIONS: l2_f5_tl1

78. TIME DISTRIBUTIONS: l2_f5_tl3

79. TIME DISTRIBUTIONS: l2_f5_tl4

80. Almost same amount of signal for f6 on all lines in the fit region, compatible values of L, large errors.

81. TIME DISTRIBUTIONS: l2_f6_tl1

82. TIME DISTRIBUTIONS: l2_f6_tl3

83. TIME DISTRIBUTIONS: l2_f6_tl4

84. SAME TARGET LINE FOR DIFFERENT FACES: L2 MULTI-FACES RUNS

85. The amount of light collected in a same target line due to different LEDs in the OB can differs up to 50 %. This change in the amount of light has an impact on the value of L and its error, this in target line L1.

86. The amount of light collected in a same target line due to different LEDs in the OB can differs up to 70%. This change in the amount of light has an impact on the value of L and its error, this in target line L3.

87. The amount of light collected in a same target line due to different LEDs in the OB can differs up to 70%. This change in the amount of light has an impact on the value of L and its error, this in target line L4.

88. LARGE STATISTICS: L2 44552 RUN (1M events)

89. Largest amount of light in target line L1, in the fit region. One strange point with huge error comes from an atypical entry in time distributions (SEE NEXT SLIDE).

90. TIME DISTRIBUTIONS: l2_f1_tl1

91. TIME DISTRIBUTIONS: l2_f1_tl3

92. TIME DISTRIBUTIONS: l2_f1_tl4

93. CONCLUSIONS: All the target lines for all the flashing lines considered, show the same behaviour: for the different OB faces flashing to the same target line, the amount of light collected can differs up to 80 % and its impact on the transmission length is clear. For the other side, when we measure with only one face for different target lines, it reveals that the more stable value for the transmission length is reached for the line which collects more light than the other ones. Taking into account the below statements, i propose to measure the transmission length of line in the neighboring line which collects more light than the other ones, it will require to change the code substantially, then we can see how the distribution of transmission length is, for all the blue runs we have. Source of plots: L2 multi-faces: http://ific.uv.es/~yepes/optical_properties/new_analisis/cal_141111/plotsHoy/l2_multi/ L2 large statistics: http://ific.uv.es/~yepes/optical_properties/new_analisis/cal_141111/plotsHoy/l2_largeStats/ L4 multi-faces: http://ific.uv.es/~yepes/optical_properties/new_analisis/cal_141111/plotsHoy/