06 FEB 20079 th ACFA Development of fine strip scintillator with extrusion technique SungHyun Chang, DongHee Kim, Jun Suhk Suh, Youngdo Oh, Daejung Kong,

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06 FEB th ACFA Development of fine strip scintillator with extrusion technique SungHyun Chang, DongHee Kim, Jun Suhk Suh, Youngdo Oh, Daejung Kong, Jieun Kim, Yuchul Yang, Adil Khan, Ajmal muhamad, Mian Shabeer Ahmad Hadron Collider Physics Lab. Kyungpook National University, Korea

06 FEB th ACFA Motivation Concept of strip calorimeter –Sampling calorimeter with scintillator and W for ECAL –Realize fine granularity (effective segmentation ~1cm x 1cm) for PFA with strip structure –Huge number of readout channels for a ILC detector ~10M channels for ECAL –Readout by MPPC

06 FEB th ACFA Basic Configuration Prototype for EM Calorimeter One Layer : Tungsten : 90mm x 90mm x 3.5mm Scintillator : 10mm(width) x 45mm(length) x 3mm(thickness) x 18 strips Total : 26 Layers ( ~ 18X 0 ) Fine strip scintillator required !

06 FEB th ACFA Plastic Scintillator Component : Polystyrene pellets + Dopants(primary & secondary) Dopants –Primary dopants (blue - emitting) PPO(2,5-biphenyloxazole) 1.3 % (by weight) concentration –Secondary dopants (green – emitting) POPOP(1,4-bis(5-Phenyloxazole-2-yl)benzene), 0.1 % (by weight) concentration Production : Extrusion method –Extrusion is easy to make numerous type of scintillator –Lower cost than casting method

06 FEB th ACFA Extrusion Process 3mm 10mm 1~1.2mm hole for WLS fiber

06 FEB th ACFA Very early R&D results First polystyrene bar (MINOS) was produced, 40mm(width) x 10mm(thickness) -> The Mechanical process has been established Light Yield measurement for our tiles and reference -> the best samples show (93±8)% light yield of the reference sample Ready to produce fine strip scintillator from previous results

06 FEB th ACFA Produced fine scintillator strips KNU strip w/o TiO 2 with hole KNU strip with TiO 2 with hole Kuraray tile with groove KNU strip with TiO 2 w/o hole

06 FEB th ACFA Specification for test Readout PMT : H6568 MAPMT (16 channels) HV = -800V, QE = ~13%(~500nm) Beta-ray source : 90 Sr (with collimator) WLS fiber : Kuraray Y-11 Pico Ammeter : Keithly 485 QDC : CAEN v792 ( 32ch, 0~400pC, 12 bit resolution. ) PCI interface between VME and PC

06 FEB th ACFA Attenuation Length measurements Sample : KNU tile with hole 10mm x 1000mm x 3mm

06 FEB th ACFA Light Yield along position for each strips 1cm 5cm 10cm 15cm 20cm 25cm 30cm 35cm 40cm uA Sample size : 10mm x 500mm x 3mm The number of samples : 30 strips Samples : KNU tile with hole &TiO 2 with fiber

06 FEB th ACFA Light Yield Uniformity for all strips σ = 0.05

06 FEB th ACFA Position dependence along the strip types Sample : KNU tile 10mm x 100mm x 3mm

06 FEB th ACFA Measurement of p.e. PMT 1 p.e. = 13.2 ADC counts PMT : MAPMT H6568 QDC : CAEN V792

06 FEB th ACFA Measurement of absolute Light Yield = ~ 30 photons 13.2 (ADC count / 1pe) * Q.E. # of photon from fiber = Pulse height (ADC counts) pedestal signal – = counts # of p.e. : / 13.2 = 3.84 # of photons from fiber : 3.84 / 0.13 = Sample : KNU tile with hole with TiO 2 10mm x 50mm x 3mm Fiber : 30cm kuraray Y11 PMT : MAPMT H6568 QDC : CAEN V792

06 FEB th ACFA Light Yield Comparison 37 photons 30 photons Kuraray sample with 3M reflector KNU sample with TiO photons KNU sample w/o TiO2 with 3M reflector % Sample size : 10mm x 50mm x 3mm

06 FEB th ACFA Light Yield Comparison 37 photons 30 photons Kuraray sample with 3M reflector KNU sample with TiO 2 37 photons KNU sample w/o TiO 2 with 3M reflector % Sample size : 10mm x 50mm x 3mm

06 FEB th ACFA Mega strip concept 5 strips together All with TiO 2 as reflector Each cell optically isolated It is under development

06 FEB th ACFA Summary Fine strip has been mechanically established. Enough light yield (~30 photons) KNU sample (10mm x 50mm x 3mm). Good uniformity can be handled by quality controlled. Under development of mega strips.