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Optimize Second Dopant Concentration for Scintillating Fibers at KEK Beam Test

Explore light yield with varying dopant concentrations in scintillating fibers through beam tests at KEK, optimizing performance. Detailed results and analysis provided.

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Optimize Second Dopant Concentration for Scintillating Fibers at KEK Beam Test

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  1. KEK beam test H. Sakamoto

  2. Purpose • To optimize a concentration of the second dopant for scintillating fibers • KEK beam test to study light yields for various concentrations • Summary

  3. Purpose for the beam tests • We tested the light with two difference tests to study the light yield with realistic components of 3HF concentration dependence • First time (T553-1): calibrated the gain of pmt with 1 p.e. • Second (T553-2) : 〃 with more p.e. (～20p.e.) T553 (this time) T542 (last year) • SciFi length 40cm 20cm • Mirror aluminized mirror aluminized mylar • Connection MICE connector acryl board • Clear fiber w/ and w/o 4m no • PMT R7411U-40MOD R7899-MOD

  4. Scintillating fibers tested • Kuraray SCSF-3HF ; 0.35mm-phi, multi-clad, s-type • In this beam test, pT(2%) scifi was also tested. • pT(1%) + 3HF(5000ppm) • pT(2%) + 3HF(5000ppm) • pT(1%) + 3HF(3500ppm) • pT(1%) + 3HF(2500ppm) • pT(1%) + 3HF(4500ppm) • pT(1%) + 3HF(7500ppm) • pT(1%) + 3HF(10000ppm) • pT(2%) + 3HF(10000ppm)

  5. Attaching SciFi with MICE conn. • Attached the SciFi and clear fibers with MICE conn. • Clear fibers for pmt’s gain calibration SciFi (0.35mmΦ): 14fibers Clear fib Clear fiber (1.05mmΦ) SciFi

  6. Scintillating fiber • Connecting the SciFi into the hole of MICE connector

  7. Fixing by optical cement • Fixed the SciFi with optical cement

  8. Quantum efficiency of VLPC • 3HF emission spectrum 520nm 520nm Q.E. of VLPC & 3HF emission spectrum

  9. Quantum efficiency

  10. Photo multiplier tube • We used the photo multiplier tube instead of VLPC. • Hamamatsu R7411U-40MOD • GaAsP (Gallium-Arsenic-Phosphorous) • 8mm diameter • 10 stage • Head-on Type • HV= -850V

  11. 22mm 20 fibers Aluminized tape Set up T542 (last year) • Side view • Front view Sci-Fi PMT PMT Sci-fi • These were in a dark box

  12. KEK beam test set up Ⅰ TOF2 TOF1 Sci-Fi D1 D2 D3 Beam • p+ • π+ • 0.6 GeV/c • 1.2 Gev/c Dark box 1.5m 4m • Trigger • coincidence of all counters • Data we took • ADC & TDC of all counters and Sci-Fi Sci-Fi TOF2 D1 D2

  13. Set up (T553) • Beam area Dark box

  14. Set up (T553) • In the dark box D1 SciFi and support D2

  15. mirror pmt SciFi Setup (T553) • SciFi and its support gide before setting in the dark box

  16. Aluminized mirror SciFi Mirror

  17. PMT (R7411U-40MOD) PMT SciFi

  18. 14 fibers were arranged into 420um bitch Close up of SciFi

  19. Arrangement of Scifi • For single layer : 14 fibers 420um • For double layer : 3 fibers for up and 4 for down

  20. T553-1 (first test) • Gain calibration -1 • calibrated the PMT’s gain by 1 p.e. • Injected the LED light adjusted as 1 p.e. to the cathode surface of the PMT. • 1 p.e. was determined with the ratio of 0 p.e. and 1 p.e. • But this measurements was not worked • Not good S/N • To the second test  with higher p.e.#

  21. T553-1 (first time) • The result : Light yield 1.5000 -1% 2. 4500 -1% 3. 10000 -1% 4. 2500 -1% 5. 5000 -2% 6. 3500 -1% 7. 7500 -1% 8. 10000 -2% • These are not p.e. but the relative values are meaningful. • 5000ppm has the highest lightyield in tested fibers.

  22. T553-2 (second test) • Gain calibtion -2 • Adjusted the LED to about 20 p.e. • P.e.# was estimated by ((MEAN)/(RMS))^2

  23. Beam stability • Stability of beam momentum by Time of flight of 0.6 (Gev/c) proton

  24. Monte Carlo • Simulated 1.2 (GeV/c) data for proton and pion • Histgram (red) = MC • Plot w/ err = data Pion Proton

  25. Result of light yield • Light yield of 5000ppm-(1%) P.e.# (estimated by MC) • Light yield (5000-1%) = 8 p.e. @MIP

  26. Result of light yield • Light yield of 2500ppm-(1%) P.e.# (estimated by MC) • Light yield (2500-1%) = 6.5 p.e. @MIP

  27. The result • Single layer && 4m clear fiber 5000ppm-1% 2500ppm-1%

  28. The result • Double layer && NO clear fiber 2500ppm-1% 5000ppm-1%

  29. The result • Double layer && 4m clear fiber 2500ppm-1% 5000ppm-1%

  30. Conclusion from the beam test • We tested scintillating fibers of different 3HF concentration. • We used green sensitive PMTs in stead of VLPC. • The result of light yield test • Single layer • 5000ppm-1% : 8 p.e. (3 p.e.) • 2500ppm -1%: 6.5 p.e. (3 p.e.) • Double layer • 5000ppm-1%: 10 p.e (4.5 p.e.) • 2500ppm-1%: 8 p.e. (4.5 p.e.)

  31. Summary • We studied the light yield of scintillation fibers mixed with 3HF as a secondary dopant with realistic component . • We studied the light yield with some conditions. • w/ and w/o 4m clear fiber • Single and double layer • The result of light yield • pT(1%) + 3HF(5000ppm)has the highest light yield in any conditions.

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