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Advanced Extruded Scintillator R&D

Advanced Extruded Scintillator R&D. Alan Bross. Context. The extruded scintillator R&D Program started at Fermilab about 14 years ago Primary Goal reduce cost using Industrial Techniques for production – Extrusion Advantages Use commercial polystyrene Manufacture almost any shape

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Advanced Extruded Scintillator R&D

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  1. Advanced Extruded Scintillator R&D Alan Bross

  2. Context • The extruded scintillator R&D Program started at Fermilab about 14 years ago • Primary Goal reduce cost using Industrial Techniques for production – Extrusion • Advantages • Use commercial polystyrene • Manufacture almost any shape • Very-High production rates possible • LOW COST • Disadvantage • Poorer optical quality • Requires WLS fiber readout • Original work utilized extrusion equipment at outside vendor • Their facilities/production techniques certainly not optimized for high-quality scintillator production Alan Bross ANL-UChicago-FNAL CM4 June 26, 2008

  3. FNAL-NICADD Extrusion Facility State-of-the-Art Optimized for Scintillator Fully automated Alan Bross ANL-UChicago-FNAL CM4 June 26, 2008

  4. POLYMER FEEDER DOPANT FEEDER POLYMER DRYER MELT PUMP EXTRUDER DIE CONVEYOR FNAL-NICADD EXTRUSION FACILITY • In-line continuous process: • Less handling of raw materials • Precise metering of feeders • Twin-screw extruder (better mixing) • Melt pump offers steady output • Control instrumentation Alan Bross ANL-UChicago-FNAL CM4 June 26, 2008

  5. Projects • D0 preshower detectors • MINOS • SciBar – K2K/SciBoone • Star • Mayan Pyramid Mapping • UT-Austin Alan Bross ANL-UChicago-FNAL CM4 June 26, 2008

  6. Projects II • Hall B – JLAB • Minerva • T2K – ND280 • Rochester • Lancaster • Kyoto (Ingrid) • Double-Chooz • Amiga – Pierre Auger Alan Bross ANL-UChicago-FNAL CM4 June 26, 2008

  7. Next step in R&D • Potential Process Modifications • Run multiple threads • Maximizes throughput of machine • Minimizes linear speed of extrusion part exiting die • Stability/Cooling issues • Co-extrude Kuraray fiber with the scintillator profile • Reduce handling of WLS • Fiber Co-extrusion • Prototyped with outside vendor some 8 years ago • Post-clad Kuraray fiber • Polyethylene • Kynar • Teflon • No degradation of fiber seen (but thin (100-300 mm) coatings • WLS fiber did see large heat excursion, however Alan Bross ANL-UChicago-FNAL CM4 June 26, 2008

  8. Proposal • Develop Co-Extrusion Die Tooling with ISO-9000 qualified Vendor - Guill Tool • They have experience with this type of die • Have developed tooling for co-extrusion applications that involve polymers with different melt characteristics which required pre-cooling of one or more of the components in the extrusion • Melt temperature for scintillator extrusions above the glass transition of the fiber • Much larger heat soak than in our previous tests Alan Bross ANL-UChicago-FNAL CM4 June 26, 2008

  9. Potential Benefits Extruded scintillator Profiles Readout with WLS Fiber • Advantages of co-extrusion • Almost no fiber handling yielding significant manpower cost reduction • Almost perfect scintillator-fiber optical coupling • Greater uniformity with respect to light coupling between the scintillator and WLS fiber • Benefits of UC-Fermilab Collaboration • Students and/or postdocs working on the R&D at the facility • Note: Since the demise of the Fermilab student COOP program, we have not had students (other than summer) working in the facility • R&D nature of the facility will be reinvigorated • Has become production-only facility in recent years • Will improve the prospects for technical advances yielding a more powerful/cost-effective detector technology • Allow us to Better serve user base Alan Bross ANL-UChicago-FNAL CM4 June 26, 2008

  10. 150 m 15 m 15 m 1.5 cm 15 m 3 cm Magnetized Fine-Resolution Totally Active Segmented Detector Simulation of a Totally Active Scintillating Detector (TASD) using Nona and Minerna concepts with Geant4 • 3333 Modules (X and Y plane) • Each plane contains 1000 slabs • Total: 6.7M channels • Momenta between 100 MeV/c to 15 GeV/c • Magnetic field considered: 0.5 T • Reconstructed position resolution ~ 4.5 mm B = 0.5T Alan Bross ANL-UChicago-FNAL CM4 June 26, 2008

  11. Magnet • New Idea • VLHC SC Transmission Line • Technically proven • Might actually be affordable 1 m iron wall thickness. ~2.4 T peak field in the iron. Good field uniformity Alan Bross ANL-UChicago-FNAL CM4 June 26, 2008

  12. TASD Performance II • Excellent Momentum resolution (2-4%) • Think Big(ger) • Nucleon Decay P -> p+p0 Alan Bross ANL-UChicago-FNAL CM4 June 26, 2008

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