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Measurement of 'intrinsic' properties of scintillating fibers

Measurement of 'intrinsic' properties of scintillating fibers. H. Sakamoto Osaka University, Japan Sato M. Yoshida Y. Kuno Osaka Univ. K. Yoshimura KEK. Purpose. To optimize a concentration of the secondary dopant (3HF) for scintillating fibers

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Measurement of 'intrinsic' properties of scintillating fibers

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  1. Measurement of 'intrinsic' propertiesof scintillating fibers • H. Sakamoto Osaka University, Japan • Sato M. Yoshida Y. Kuno Osaka Univ. • K. Yoshimura KEK

  2. Purpose • To optimize a concentration of the secondary dopant (3HF) for scintillating fibers • KEK beam test to study light yields & cross talk for some different concentration • Attenuation length of a clear fiber • Light yield loss • Summary

  3. Beam test @ KEK • To study the light yields and cross talk of 3HF concentration dependence • Scintillating fibers tested: Kuraray SCSF-3HF ; 350um-phi, multi-clad, s-type • Primary (pT) + Secondary (3HF;5000ppm) • Primary (pT) + Secondary (3HF;3500ppm) • Primary (pT) + Secondary (3HF;2500ppm) • No primary + Secondary (3HF;5000ppm)

  4. TOF2 TOF1 Sci-Fi D2 D1 Beam • p+ • π+ • μ+ • 600MeV/c • 700MeV/c • 1Gev/c Dark box 0.5m 5m 3m KEK beam test set up Ⅰ • Trigger • coincidence of all counters and Sci-Fi • Data we took • ADC & TDC of all counters and Sci-Fi Sci-Fi TOF2 D1 D2

  5. KEK beam test set up Ⅱ Sci-Fi in Dark box D2 TOF2 Beam line D1

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

  7. Photo multiplier tube • We used the photo multiplier tube instead of VLPC. • Hamamatsu R7899MOD • Extended Green Photocathode • 1 inch diameter • 10 stage • Head-on Type • Prismatic Window • HV= -1800V

  8. 22mm 20 fibers Aluminized tape Set up of scintillating fiber • Side view • Front view Sci-Fi PMT PMT Sci-fi • These were in a dark box

  9. count Adc count Analysis • Average number of photo electron was estimated by fitting the sci-fi ADC spectrum • to a poisson distribution. • typical sci-fi ADC spectrum

  10. 350um phi Ave. # of p.e. 5000ppm 3500ppm 2500ppm Only 5000ppm dE/dｘ(MeV/cm) Result of light yield • Light yield of 3HF concentration dependence • 5000ppm has the highest lightyield in tested fibers (2.6p.e.@MIP).

  11. Tie together every two fibers • Put black papers in between Set up for cross talk test • The differences A & B of light yield result in cross talk A • Black papers between every fiber B

  12. Result of cross talk test • Cross talk • Ave. # of p.e.@MIP (2.0 MeV/cm) • No evidence of cross talk

  13. 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 • 5000ppm has the highest light yield of 2.6 p.e. @ MIP. • The result of cross talk test • No evidence of cross talk can be seen.

  14. Atte. length of clear fiber Ⅰ • Set up • Clear fiber: KURARAY CLEAR-PS • Round, Multi-Clad, S-type • Pulser: • Duration: 1nsec • Period: 10msec • Pulse height: -5.5V • Silicon photo diode • ORIEL Model 70313

  15. Atte. length of clear fiber Ⅱ • Result • A =1.49 • B =0.32 • L1=7.62 • L2=0.69 • Attenuation Length is 7.62m. • Our waveguide of prototype is 4m clear fiber • 40% loss was estimated • Fitting • F=exp(A-x/L1)+exp(B-x/L2) KURARAY CLEAR-PS 1.05mmphi, Multi-Clad , S-type, Round

  16. Summary • We studied the light yield and cross talk of scintillation fibers mixed with 3HF as a secondary dopant. • Scintillating fibers tested： Kuraray SCSF-3HF • pT+5000ppm, pT+3500ppm, pT+2500ppm, only5000ppm • Light yield : pT+5000ppmhas the highest light yield of 2.6 p.e.@M.I.P. • Cross talk : No evidence of cross talk can be seen. • We also studied the attenuation length of the clear fiber. • 40% loss was estimated in 4m (in the prototype)

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