# Presentation: 565948

## 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**
**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**

## FNAL-NICADD Extrusion Facility

**State-of-the-Art**
**Optimized for Scintillator**
**Fully automated**

## 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**

**Notes:**
Graph of our extrusion line without the cooling tanks, puller and saw.

These are the main items that make our system different from the extrusion companies that we have visited or used in the past.  This line works in a continuous mode, minor handling of the raw materials, feeders are able to dispense the correct amount at any given output rate, excellent control of the shape of the extruded scintillator and the line can be inerted from the dryer to the extruder.

## Projects

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

## Projects II

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

## 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 ********m) coatings**
**WLS fiber did see large heat excursion, however**

## 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**

## 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**

## Magnetized Fine-Resolution Totally Active Segmented Detector

- Simulation of a Totally Active Scintillating Detector (TASD) using Noa and Minera 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**

## 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**

## TASD Performance II

**Excellent Momentum resolution (2-4%)**

**Think Big(ger)**
**Nucleon Decay **

- P -> + 0