1 / 26

Detector with Plastic Scintillators

Detector with Plastic Scintillators. DongHee Kim Kyungpook National University. Contents. Extruded Plastic Scintillator 2. Current R&D Status 3. Summary of R & D so far 4. Application to Far Detector 5. Summary & Conclusion. Extruded Scintillator. Comparing with Casting method:

joanna
Download Presentation

Detector with Plastic Scintillators

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. Detector with Plastic Scintillators DongHee Kim Kyungpook National University International Workshop on a Far Detector in Korea for theJ-PARC Neutrino Beam, KIAS, Nov 18-19, ‘05

  2. Contents • Extruded Plastic Scintillator 2. Current R&D Status 3. Summary of R & D so far 4. Application to Far Detector 5. Summary & Conclusion International Workshop on a Far Detector in Korea for theJ-PARC Neutrino Beam, KIAS, Nov 18-19, ‘05

  3. Extruded Scintillator • Comparing with Casting method: • Use commercial polystyrene pellets → Cheap ! • Processing flexibility → Manufacture of essentially any shape with reflector. • Experimental applications: • MINOS for two detectors: 300 ton of scintillator strips • D0 for two preshower detectors • Star for a shower max. detector in the em. end-cap calorimeter • MINERVA • K2K – SciBar detector • And more …many applications for your future detectors International Workshop on a Far Detector in Korea for theJ-PARC Neutrino Beam, KIAS, Nov 18-19, ‘05

  4. Extruded Plastic Scintillator • Component: Polystyrene pellets + Dopants (primary & secondary) • Dopants • Primary dopants (UV-emitting) • PPO(2,5-biphenyloxazole) , PT(p-Teraphenyl) • 1-1.5% (by weight) concentration • Secondary dopants (blue-emitting) • POPOP(1,4-bis(5-Phenyloxazole-2-yl)benzene), • bis-MSB(4-bis(2-Methylstyryl)benzene) 0.01-0.03% (by weight) concentration International Workshop on a Far Detector in Korea for theJ-PARC Neutrino Beam, KIAS, Nov 18-19, ‘05

  5. Plastic Scintillator – how does it work ? Excitation of base plastic by radiation Base plastic 10-8 m Faster energy transfer PPO (~1%) Emit UV ~340nm photon 10-4 m Absorb UV photon POPOP(~0.05%) Emit blue ~400nm photon Use WLS fibers as readout Detector (PMT, photo diode …. ) International Workshop on a Far Detector in Korea for theJ-PARC Neutrino Beam, KIAS, Nov 18-19, ‘05

  6. Die and Materials • Die profile • This was originally for MINOS tile • We start to produce this tile for a reference • produce and compare the light yield with reference tile • Mixture of dopants Polystyrene : 100% PPO : from 1.0 % POPOP : from 0.03% International Workshop on a Far Detector in Korea for theJ-PARC Neutrino Beam, KIAS, Nov 18-19, ‘05

  7. Extrusion Process Produced at MiSung Chem. co. In Korea International Workshop on a Far Detector in Korea for theJ-PARC Neutrino Beam, KIAS, Nov 18-19, ‘05

  8. Current R&D Status • The pure polystyrene bar was produced (w/o PPO, POPOP) •  The mechanical process has been established and choose the best polystyrene • PPO and POPOP were mixed up with polystyrene •  The 1st scintillator had been produced. • Many scintillator strips have been producedwith different situations since then. •  different amount of PPO and POPOP, nitrogen and/or vacuum, • various mix-up methods etc. International Workshop on a Far Detector in Korea for theJ-PARC Neutrino Beam, KIAS, Nov 18-19, ‘05

  9. Mechanical establishment of tile • Produce polystyrene bar without PPO & POPOP for mechanical establishment • TiO2 was co-extruded to make reflector for test. • Excellent bars were produced  assure mechanically • Then, 1st batch came with PPO and POPOP. Progress International Workshop on a Far Detector in Korea for theJ-PARC Neutrino Beam, KIAS, Nov 18-19, ‘05

  10. Production of Scintillator bar International Workshop on a Far Detector in Korea for theJ-PARC Neutrino Beam, KIAS, Nov 18-19, ‘05

  11. Comparison of transparency Oxidation made the sample opaque because of production in air. Reference samples Polystyrene (only) bar Recentbatch 1st batch Progress International Workshop on a Far Detector in Korea for theJ-PARC Neutrino Beam, KIAS, Nov 18-19, ‘05

  12. Preparation of test samples WLS fiber International Workshop on a Far Detector in Korea for theJ-PARC Neutrino Beam, KIAS, Nov 18-19, ‘05

  13. FAN IN-OUT Disc Logic unit Gate Generator 100 ns Delay VME readout Scintillator test setup • 5 reference samples and new samples with the same geometrical shape and size were used to compare the light yield Typical cosmic ray From reference sample + WLS International Workshop on a Far Detector in Korea for theJ-PARC Neutrino Beam, KIAS, Nov 18-19, ‘05

  14. Polystyrene only • products of LG and Dongbu chemical company • totally about 10 polystyrenes tested • chose LG 25 E • (the best attenuation length etc..) International Workshop on a Far Detector in Korea for theJ-PARC Neutrino Beam, KIAS, Nov 18-19, ‘05

  15. Pulse Height (1st batch) Our sample(1st batch) Our scintillator bars (5 samples) <ADC counts> = 225.9  24.9 Reference scintillator bars(5 samples) <ADC counts> = 534.8 56.9 ADC counts Reference sample Relative Light Yield of the first samples shows 42.3% of reference samples International Workshop on a Far Detector in Korea for theJ-PARC Neutrino Beam, KIAS, Nov 18-19, ‘05 ADC counts

  16. Light Yield Relative Light Yield Reference tile to be 100% light yield Progress Progress International Workshop on a Far Detector in Korea for theJ-PARC Neutrino Beam, KIAS, Nov 18-19, ‘05

  17. Light Yield (currently the best one) Reference Sample New Sample Relative Light Yield of new samples shows (93±8)% of reference samples’ one. International Workshop on a Far Detector in Korea for theJ-PARC Neutrino Beam, KIAS, Nov 18-19, ‘05

  18. Position Scan Scan across the fiber International Workshop on a Far Detector in Korea for theJ-PARC Neutrino Beam, KIAS, Nov 18-19, ‘05

  19. Summary of R & D so far • First Polystyrene bar produced with PPO and POPOP  The mechanical process has been established • Light yield measured for new and reference samples  Currently the best samples show (93±8) % light yield • Of course, need much more R & D in the future • improving attenuation length, light yield, uniformity and radiation hardness etc.. • Fiber(WLS and clear) will be also R & Ded in the Misungcompany • We can apply this to the detectors • The LHC and LC … calorimeters • Neutrino LB Experiments • Reactor experiments etc…. International Workshop on a Far Detector in Korea for theJ-PARC Neutrino Beam, KIAS, Nov 18-19, ‘05

  20. Application to the Far Detector • For appearance experiment • Totally active is appropriate • Nova already chose liquid scintillator option • Here we consider the plastic scintillator option • Reference from Nova proposal – Thanks for them! • Nova adopted Liquid scintillator option International Workshop on a Far Detector in Korea for theJ-PARC Neutrino Beam, KIAS, Nov 18-19, ‘05

  21. Application to the Far Detector • Total Plastic Scintillator Calorimeter • all active absorber • 300 X0 depth • ~ 2000 Layers • each layer : 15m x 15m • 27kT plastic scintillator • one bar : 6cm x 6cm x 15m • 250 bars/layer • x-y positioning every other layer • Total ~ 500k channels 120m 15m 6cm 6cm 15m International Workshop on a Far Detector in Korea for theJ-PARC Neutrino Beam, KIAS, Nov 18-19, ‘05

  22. Scintillator Bar • Polystyrene + PPO + POPOP • 2mm WLS Fiber embedded in the bar • Light Reflector(TiO2) • readout both ends by APD(or SiPM??) • need about 1M APDs • Ensure enough light yields • with 2mm WLS fiber (4time better light collection compared with 1mm fiber) and Both end readout International Workshop on a Far Detector in Korea for theJ-PARC Neutrino Beam, KIAS, Nov 18-19, ‘05

  23. Cost Estimates • Scintillator & Fiber : $ 87M • Electronics and DAQ : $ 8M • Building & outfitting etc.. : $20M • Total cost : ~ $114M • Very rough estimates • Need more studies Scintillator costs International Workshop on a Far Detector in Korea for theJ-PARC Neutrino Beam, KIAS, Nov 18-19, ‘05

  24. Summary • will start R & D for this far detector • Plastic scintillator option may also be feasible • scintillator R & D will go on as it scheduled International Workshop on a Far Detector in Korea for theJ-PARC Neutrino Beam, KIAS, Nov 18-19, ‘05

  25. Backup International Workshop on a Far Detector in Korea for theJ-PARC Neutrino Beam, KIAS, Nov 18-19, ‘05

  26. Application to the Far Detector • Option B : • Sampling Calorimeter • Scintillator/Fe Sandwitch • 300 X0 depth • ~ 230 Layers • each layer : 15m x 15m • Iron 15m x 15m x 2cm • Iron 2cm = 1.14 X0 • 8kT iron • 3.1kT plastic scintillator • one strip: 6cm x 6cm x 15m • 250 strips/layer • x-y positioning every other layer ~20m 2cm thick Fe 15m Scintillator Bar 15m International Workshop on a Far Detector in Korea for theJ-PARC Neutrino Beam, KIAS, Nov 18-19, ‘05

More Related