1. The comparison between two kinds of fibers and testing the effect of MCPET as reflector
Cunfeng Feng
Ang Li
SDU 2017/3/23 1

2. Purpose
The comparing experiment aimed to compare the effect of Y11 fiber and Saint Gobain fiber and improved the experiment by covering scintillators with Tyvek because I did not cover scintillators with Tyvek in the last experiment.
The experiment which tested the effect of MCPET aimed to see whether the MCPET serves better than print paper as reflectors. 2

3. The structure of the experiment
trigger
Up trigger
Scintillator(with fibers)
signal
Scintillator(with fibers)
Down trigger 3 3

4. scintillators covered with Tyvek4

5. Y11：group 1 5

6. Y11：group 2 6

7. Saint Gobain：group 1 7

8. Saint Gobain：group 2 8

9. result fiber Saint Gobain Group(with Tyvek) 1 2
Number of photoelectron
15.6
18.4
32.3
27.3
fiber
Saint Gobain
Group(without Tyvek) 1 2
Number of photoelectron
13.9
12.4
19.6
21.4 9

10. Scintillators(with reflectors)
Testing the effect of MCPET as reflector
Up trigger
trigger
PMT
signal
Scintillators(with reflectors)
Down trigger
The structure of scintillators to be tested(The black boxes are lead plates, the blue lines are reflectors, the blue boxes are scintillators)
The structure of the experiment 10

11. Testing the effect of MCPET as reflector
Up trigger
Scintillators
Down trigger 11 11

12. Testing the effect of MCPET as reflector
MCPET is the abbreviation of Micro Cellular PET, this material can decrease the waste of light by its high reflectivity which is higher than 95%.
MCPET
Print paper 12

13. MCPET 13

14. Print paper 14

15. Results Material MCPET Print paper Number of photoelectrons 13.0 11.115 15

16. Summary
In the first experiment, we can tell the Y11 fiber performs better than the Saint Gobain fiber
In the second experiment, we can see the effects of MCPET and print paper are similar. 16 16