Advanced Extruded Scintillator R&D

Alan Bross

2 Alan Bross ANL-UChicago-FNAL CM4 June 26, 2008

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

3 Alan Bross ANL-UChicago-FNAL CM4 June 26, 2008

FNAL-NICADD Extrusion Facility

State-of-the-ArtOptimized for Scintillator

Fully automated

4 Alan Bross ANL-UChicago-FNAL CM4 June 26, 2008

FNAL-NICADD EXTRUSION FACILITY

POLYMERDRYER

CONVEYOR

POLYMER FEEDER

DOPANT FEEDER

EXTRUDER

MELT PUMP

DIE

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 Alan Bross ANL-UChicago-FNAL CM4 June 26, 2008

Projects

D0 preshower detectors

MINOS

SciBar – K2K/SciBoone Star Mayan Pyramid Mapping

UT-Austin

6 Alan Bross ANL-UChicago-FNAL CM4 June 26, 2008

Projects II

Hall B – JLAB

Minerva

T2K – ND280 Rochester Lancaster Kyoto (Ingrid)

Double-Chooz Amiga – Pierre Auger

7 Alan Bross ANL-UChicago-FNAL CM4 June 26, 2008

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

8 Alan Bross ANL-UChicago-FNAL CM4 June 26, 2008

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 Alan Bross ANL-UChicago-FNAL CM4 June 26, 2008

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

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 Noa and Minera concepts with Geant4

3 cm

1.5 cm15 m

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

15 m

15 m

150 m

B = 0.5T

11 Alan Bross ANL-UChicago-FNAL CM4 June 26, 2008

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 Alan Bross ANL-UChicago-FNAL CM4 June 26, 2008

TASD Performance II

Excellent Momentum resolution (2-4%) Think Big(ger)

Nucleon Decay

P -> + 0