1 / 18

Development of fine strip scintillator with extrusion technique

Development of fine strip scintillator with extrusion technique. Sung H yun Chang , Dong H ee Kim, Jun S uhk Suh, Youngdo Oh, Daejung Kong, Jieun Kim, Yuchul Yang, Adil Khan, Ajmal muhamad , Mian Shabeer Ahmad. Hadron Collider Physics Lab. Kyungpook National University, Korea.

oliana
Download Presentation

Development of fine strip scintillator with extrusion technique

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. 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

  2. Motivation • Concept of strip calorimeter • Sampling calorimeter withscintillator 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~10Mchannels for ECAL • Readout by MPPC

  3. Basic Configuration • Prototype for EM CalorimeterOne Layer :Tungsten : 90mm x 90mm x 3.5mm Scintillator : 10mm(width) x 45mm(length) x 3mm(thickness) x 18 strips Total : 27 Layers ( ~ 27X0) Fine strip scintillator required !

  4. 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

  5. 10mm 3mm 1~1.2mm hole for WLS fiber Extrusion Process

  6. 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-> Currently the best samples show (93±8)% light yield of the reference sample • Ready to produce fine strip scintillator from previous results

  7. Produced fine scintillator strips KNU strip with TiO2w/o hole KNU strip w/o TiO2with hole Kuraraytilewith groove KNU strip with TiO2with hole

  8. Specification for test • Readout PMT : H6568 MAPMT (16 channels)HV = -800V , QE = ~13%(~500nm) • Beta-ray source : 90Sr (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

  9. Attenuation Length measurements

  10. Light Yield along position for each strips nA Sample size : 10mm x 500mm x 3mmThe number of samples : 30 strips 1cm 5cm 10cm 15cm 20cm 25cm 30cm 35cm 40cm

  11. Light Yield Uniformity for all strips σ = 0.05

  12. Position dependence along the strip types

  13. Measurement of p.e. PMT 1 p.e. = 13.2 ADC counts

  14. Sample : KNU tile 10mm x 50mm x 3mm 189.606 – 138.91 = 50.696 counts# of p.e. : 3.84 = 50.696 / 13.2# of photons from fiber : 3.84 / 0.13 = 29.54 Measurement of absolute Light Yield pedestal signal # of photon from fiber = Pulse height (ADC counts) = ~ 30photons 13.2 (ADC count / 1pe) * Q.E.

  15. 36.86photons 36.67photons 29.54photons Kuraray sample with 3M reflector KNU sample with TiO2 KNU sample w/o TiO2 with 3M reflector Light Yield Comparison %

  16. 36.86photons 36.67photons 29.54photons Kuraray sample with 3M reflector KNU sample with TiO2 KNU sample w/o TiO2 with 3M reflector Light Yield Comparison %

  17. Mega strip concept • 5 strips together • All with TiO2 as reflector • Each cell optically isolated • It is developed

  18. 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.

More Related