Advanced Extruded Scintillator R

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Advanced Extruded Scintillator RD

• Alan Bross

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Context

• The extruded scintillator RD 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

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FNAL-NICADD Extrusion Facility
State-of-the-Art Optimized for Scintillator Fully
automated
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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

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Projects

• D0 preshower detectors
• MINOS
• SciBar K2K/SciBoone
• Star
• Mayan Pyramid Mapping
• UT-Austin

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Projects II

• Hall B JLAB
• Minerva
• T2K ND280
• Rochester
• Lancaster
• Kyoto (Ingrid)
• Double-Chooz
• Amiga Pierre Auger

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Next step in RD

• 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

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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

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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 RD 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
• RD 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

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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
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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
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TASD Performance II

• Excellent Momentum resolution (2-4)

• Think Big(ger)
• Nucleon Decay

P -gt p p0