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Development of Extruded Scintillator Strips for the MINERVA Experiment at Fermilab

This document outlines the advancements in the production of extruded scintillator strips for the MINERVA experiment, detailing the processes and equipment used at the FNAL-NICADD extrusion facility. The continuous inline process enhances raw material handling and precision in metering, utilizing technologies such as twin-screw extruders and melt pumps under nitrogen atmosphere. Scintillator characteristics, including light yield ratios and attenuation lengths, are discussed, alongside current challenges and next steps based on feedback from MINERVA collaborators.

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Development of Extruded Scintillator Strips for the MINERVA Experiment at Fermilab

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  1. Fermi National Accelerator Laboratory EXTRUDED SCINTILLATOR STRIPS FOR MINERVA Anna Pla-Dalmau Fermilab Victor Rykalin NICADD, Northern Illinois University Minerva Collaboration Meeting August 13-15, 2004

  2. FNAL-NICADD EXTRUSION FACILITY

  3. POLYMER FEEDER DOPANT FEEDER POLYMER DRYER MELT PUMP EXTRUDER DIE CONVEYOR FNAL-NICADD EXTRUSION FACILITY OUTPUT: Scintillating pellets Scintillator bars • 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 • Line under nitrogen atmosphere: • Drying under nitrogen • Each piece of equipment is purged

  4. EXTRUSION TOOLING FOR MINERVA

  5. EXTRUSION TOOLING FOR MINERVA

  6. EXTRUSION TOOLING FOR MINERVA

  7. EXTRUSION TOOLING FOR MINERVA

  8. EXTRUDED SCINTILLATOR STRIPS FOR MINERVA

  9. SCINTILLATOR CHARACTERISTICS

  10. SCINTILLATOR CHARACTERISTICS LIGHT YIELD RATIO: 1.64 (TYVEK / NO-TYVEK) Attenuation LengthL=27.06 cm Attenuation Length L=29.42 cm

  11. SCINTILLATOR PROFILE STRIP SIZE: 32.1 mm by 16.6 mm – lip ~ 31 mm by 16.6 mm - round HOLE SIZE: 2.5-3 mm by 1.5-2 mm (OVAL) STRIPS AVAILABLE: - 50 cm long & round hole 44 STRIPS - 1.5 mm FIBER 38 STRIPS - <1.5 mm FIBER - 100 cm long & oval hole 50 - 100 STRIPS

  12. SCINTILLATOR PROFILE ROUND CORNERS VS. LIP AT THE BASE

  13. CURRENT STATUS • Reasonable triangle shape • Slightly small • Bowed / indented base – round corners • “Flatter” base – lip • The die and/or the calibrator would need to be modified. • Large and oval hole • The pin needs to be changed. • Strips show arching (upwards) at the ends • Stress caused by uneven cooling in the part

  14. NEXT STEP • Feedback from MINERVA • What is needed in the scintillator strips? • Will strips be glued? • What is the size of the fiber? • Back to the die maker to address current problems • Likely to require additional funding • FNAL number for the drawing • Purchase polystyrene and dopants • One more run “as is” to test air knife

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