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Beam test of scintillator strips

Beam test of scintillator strips. Miho NISHIYAMA Shinshu University. ・ scintillator strip calorimeter ・ Kuraray scintillator strips and KNU extruded ・ the result of DESY beam test ・ KEK beam test ・ results ・ conclusion and plan. Scintillator strip calorimeter.

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Beam test of scintillator strips

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  1. Beam test of scintillator strips Miho NISHIYAMA Shinshu University ・ scintillator strip calorimeter ・ Kuraray scintillator strips and KNU extruded ・ the result of DESY beam test ・ KEK beam test ・ results ・ conclusion and plan

  2. Scintillator strip calorimeter ・ sampling calorimeter scintillator strips ＋W ・MPPC : light sensor ・PFA requires scintillator fine segmented. →We need 10M scintillator strips. Production cost of scintillator strips must be cheap. Scintillator strip 1cm MPPC 4.5cm Thickness ： 0.3cm

  3. Comparison of scintillator strip

  4. The result of DESY beam test Read out : fiber Casting Reflector film Extruded TiO2 Response of MIP 2007 spring… Extruded scintillator strips ・ Light yield is low. ・ Uniformity is bad. Signal (ADC counts) Strip # Layer # Uniformity ExtrudedTiO2 Casting reflector film Signal (ADC counts) Beam position (mm)

  5. Extruded scintillator strips extruded Fiber Sensitive surface of MPPC Too big fiber hole Fiber – MPPC bad matching ・Some extruded scintillator strips have too big fiber hole. ・Sometimes fiber holes aren’t correctly centered.

  6. We’ll use extruded scintillator strips at FNAL beam test in this summer. So we need them because their cost of production is cheap. Extruded scintillator strips have some problems. position and size of fiber hole The objective of KEK beam test Beam test with using carefully chosen extruded scintillator strip was carried out and compared with Kuraray.

  7. beam KEK Fuji beam line ・Electron beam ・This beam is made form bremsstrahlung photons from KEKB ring ・Beam spot size: ~ 3cm x 4 cm ・Beam energy : 3 GeV ・Rate: 15Hz @ 3 GeV

  8. Scintillator Fiber Tracker Scintillator strips Scintillator Beam e- Movable stage Veto counter Semiconductor Tracker Setup Setup of side view Semiconductor Tracker (borrowed by ATLAS group) 12cm×6cm Resolution vertical : 23μm horizontal: 580μm Scintillator Fiber Tracker scintillator Beam e- Scintillator strips Movable stage Trigger counters Veto counter

  9. beam A B C D E F Scintillator Strips • 8 layers with different types of strips • 4 same type strips per one layer

  10. MIP selection For the selected strip, MIP event must satisfy following conditions: ・In the same layer, strips show the pedestal signal but the selected strip. ・In the front and the rear layer, the strips at same position of the selected strip show the MIP signal. MIP signal spacer Only pedestal signal e- MIP selected strip

  11. extruded TiO2 No fiber extruded TiO2 good matching extruded reflector bad matching extruded reflector good matching Number of events (log scale) 0 5000 0 5000 0 5000 0 5000 Kuraray reflector thickness:2mm extruded TiO2 Kuraray reflector Kuraray reflector reference 0 5000 0 5000 0 5000 0 5000 Signal (ADC counts) All collected events MIP events Response for MIP

  12. Response for MIPVariation of strip by strip All collected events MIP events Extruded scintillator strip＋reflector film good matching Number of events (log scale) Signal (ADC counts) These plots show the variation of strip by strip is big.

  13. Uniformity extruded reflector good matching extruded reflector bad matching extruded TiO2 good matching extruded TiO2 No fiber Signal (ADC counts) Kuraray reflector thickness:2mm Kuraray reflector Kuraray reflector extruded TiO2 reference Beam position (mm)

  14. UniformityVariation of strip by strip Extruded scintilattor strip＋reflector film good matching Signal (ADC counts) Beam position (mm) These plots show the variations of the uniformity aren’t so big. However light yields aren’t same.

  15. The position of fiber and MPPC is important. Reflector film works better than TiO2 . ⇒ We asked KNU to make extruded scintillator with the precise size of fiber hole and position without TiO2 . More detail analysis about KEK beam test is neccesary. In this summer, FNAL beam test will be carried out using improved extruded scintillator strips. Conclusion Plan

  16. 1mmφ Does direct light cause bad uniformity? Extruded TiO2 Good matching Extruded TiO2 Signal (ADC counts) Beam position (mm) Direct light 25% Direct light 100% 1mm 1mm

  17. Setup MPPC × Position of b-ray source x mm 57mm Extruded with TiO2 Thermostatic chamber (25 ℃) 90Sr Collimator with 2 mmf hole MPPC (Vbias = 76.5 [ V]) PMT AMP (x63) Trigger scintillator Signal input Discriminator Gate Generator ADC Gate input 72 [ns]

  18. 1mmφ 1mmφ Measurement of 3 types Scintillator with TiO2 KIMOTO reflector to shield direct light White paint to shield direct light Nothing to shield direct light

  19. Result of measurement Fiber : 43mm Fiber : 57mm＋KIMOTO reflector Fiber : 43mm＋paint MPPC side

  20. Conclusion • Direct light causes bad uniformity. 　→ We have the plan to use the coupler as the left figure shows. Using this, direct light is shielded and the fiber position becomes stable.

  21. Back up

  22. A1 A2 Extruded scintillator strip with a fiber hole（A,B） Type : B covered with KIMOTO reflector film B1 : bigger hole B2 : matched hole Type : A covered with TiO2 A1 : fiber - MPPC bad matching A2 : fiber – MPPC good matching bigger hole B1 matched hole B2 MPPC sensitive surface

  23. Scintillator Assembly frame 9cm black sheet frame spacer 9 strips for a layer 12cm KIMOTO reflector film 4.5cm FCB With MPPC 3mm scintillator strips 4.5cm 0.4cm 1cm Thickness 0.3cm

  24. All collected events MIP events Response for MIP(strip1) extruded TiO2 No fiber extruded TiO2 extruded reflector extruded reflector Number of events (log scale) Kuraray reflector thickness:2mm extruded TiO2 Kuraray reflector Kuraray reflector reference Signal (ADC counts)

  25. extruded TiO2 No fiber extruded TiO2 extruded reflector extruded reflector Number of events (log scale) Kuraray reflector thickness:2mm extruded TiO2 Kuraray reflector Kuraray reflector reference All collected events MIP events Response for MIP(strip3) Signal (ADC counts)

  26. All collected events MIP events Response for MIP(strip4) extruded TiO2 No fiber extruded TiO2 extruded reflector extruded reflector Number of events (log scale) Kuraray reflector thickness:2mm Kuraray reflector Kuraray reflector extruded TiO2 reference Signal (ADC counts)

  27. extruded reflector extruded TiO2 extruded reflector extruded TiO2 No fiber Signal (ADC counts) Kuraray reflector thickness:2mm Kuraray reflector Kuraray reflector extruded TiO2 reference Beam position (mm) Response Uniformity(strip1)

  28. Response Uniformity (strip3) extruded reflector extruded reflector extruded TiO2 extruded TiO2 No fiber Signal (ADC counts) Kuraray reflector thickness:2mm Kuraray reflector Kuraray reflector extruded TiO2 reference Beam position (mm)

  29. Response Uniformity (strip4) extruded reflector extruded reflector extruded TiO2 No fiber extruded TiO2 Signal (ADC counts) Kuraray reflector thickness:2mm Kuraray reflector Kuraray reflector extruded TiO2 reference Beam position (mm)

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