1. Advanced Extruded Scintillator R&D Alan Bross

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

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

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

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

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

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

8. 8 Alan Bross ANL-UChicago-FNAL CM4 June 26, 2008 Proposal  Develop Co-Extrusion Die Tooling with ISO-9000 qualified Vendor - Guill Tool u They have experience with this type of die u 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 u Melt temperature for scintillator extrusions above the glass transition of the fiber u Much larger heat soak than in our previous tests

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

10. 10 Alan Bross ANL-UChicago-FNAL CM4 June 26, 2008 Magnetized Fine-Resolution Totally Active Segmented Detector Simulation of a Totally Active Scintillating Detector (TASD) using No a and Miner a concepts with Geant4 3 cm 1.5 cm 15 m u 3333 Modules (X and Y plane) u Each plane contains 1000 slabs u 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 15 m 150 m B = 0.5T

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

12. 12 Alan Bross ANL-UChicago-FNAL CM4 June 26, 2008 TASD Performance II  Excellent Momentum resolution (2-4%)  Think Big(ger) u Nucleon Decay P ->  +  0