1. PCAL Strips light transmission properties April 25, 2011April 26, 20111April 27, 20111

2. For each layer only (longer) half of the strips are measuring (shorter and longer are part of the same strip) April 26, 20112April 27, 20112

3. Initial steps of measurements:  Recording and source movement is automated,  Glued 4 fibers to adapter,  Optical grease (BC-630) contact with PMT,  Not glued, no optical grease,  Source moving steps 1cm, 10cm,  KEITHLEY reading PMT anode current and recording average value (in 20, 100, 200 and 1000 time) in each step,  One fiber in each hole,  Cleaning holes by thin metallic bars, one and two together,  After cleaning by metallic bars cleaning holes with Nitrogen,  Cleaning fibers before inserting in the strip,  Checking the plots during each measurements and comparing with reference plot,  Rad. Source: 90 Sr, 25 µCi, 5mm collimator. To improve the quality of measurements:  Moved PMT to opposite side of motor in the dark box,  Grounding the aluminum profiles and wrapped PMT tube with Cu foil 3April 25, 2011April 26, 20113April 27, 20113

4. Final procedure for measurements:  Optical grease contact with PMT,  Fibers are not glued to adapter,  Step size 10cm,  KEITHLEY reading 20 time at each position,  Two fibers in each hole,  Cleaning holes with Nitrogen,  Cleaning fibers before inserting in to the strip (strip kept in vertical position,  Checking the plots after each measurements comparing with reference plot. 4April 25, 2011April 26, 20114April 27, 20114

5. April 23, 2011April 25, 20115April 26, 20115April 27, 20115

6. April 23, 2011April 25, 20116April 26, 20116April 27, 20116

7. April 23, 2011April 25, 20117April 26, 20117April 27, 20117

8. April 23, 2011April 25, 20118April 26, 20118April 27, 20118

9. April 23, 2011April 25, 20119April 26, 20119April 27, 20119

10. April 23, 2011April 25, 201110April 26, 201110April 27, 201110

11. April 26, 201111April 27, 201111

12. The ratio of PMT anode current at the end of longest strip to background is: ~23 12 April 25, 2011 Typical distribution April 26, 201112April 27, 201112

13. Current ratio (last point to background) April 27, 201113

14. Comparison of measurements 14April 25, 2011 new reference April 26, 201114April 27, 201114

15. Broken fibers 15April 25, 2011April 26, 201115April 27, 201115

16. A 0 A 1 - Intensity α 1 α 2 - Attenuation (Short and Long) Fitting function for attenuation calculation 16 April 25, 2011April 26, 201116April 27, 201116

17. Typical fitting (Length > 250cm) 17April 25, 2011April 26, 201117April 27, 201117

18. Length < 250cm 18April 25, 2011April 26, 201118April 27, 201118

19. 19April 25, 2011 Long and short attenuation lengths April 26, 201119April 27, 201119

20. Ratio A L (2 exp case) to A (1 exp in Range > 250cm) Fit to linear function C + tan( α )* X April 26, 201120April 27, 201120

21. 21April 25, 2011April 26, 201121April 27, 201121

22. 22April 25, 2011April 26, 201122 N pe measurements April 27, 201122

23. April 27, 201123

24. Single photoelectron (peak parameters definition) April 27, 201124

25. April 27, 201125

26. April 27, 201126

27. N pe definition (under cosmic ray, deposit energy ≈ 2 MeV ) April 27, 2011 27

28. April 27, 201128