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Advanced Extruded Scintillator R

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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 ... – PowerPoint PPT presentation

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Title: Advanced Extruded Scintillator R


1
Advanced Extruded Scintillator RD
  • Alan Bross

2
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

3
FNAL-NICADD Extrusion Facility
State-of-the-Art Optimized for Scintillator Fully
automated
4
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

5
Projects
  • D0 preshower detectors
  • MINOS
  • SciBar K2K/SciBoone
  • Star
  • Mayan Pyramid Mapping
  • UT-Austin

6
Projects II
  • Hall B JLAB
  • Minerva
  • T2K ND280
  • Rochester
  • Lancaster
  • Kyoto (Ingrid)
  • Double-Chooz
  • Amiga Pierre Auger

7
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

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

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 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

10
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
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
12
TASD Performance II
  • Excellent Momentum resolution (2-4)
  • Think Big(ger)
  • Nucleon Decay

P -gt p p0
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