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Quartz Plates R&D Status

Quartz Plates R&D Status. By F. Duru, S. Ayan, U. Akgun, J. Olson, Y. Onel The University Of Iowa V.Podrasky, C. Sanzeni, D.R.Winn Fairfield University. Quartz Plates as Radiation-Hard Detectors.

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Quartz Plates R&D Status

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  1. Quartz Plates R&D Status By F. Duru, S. Ayan, U. Akgun, J. Olson, Y. Onel The University Of Iowa V.Podrasky, C. Sanzeni, D.R.Winn Fairfield University

  2. Quartz Plates as Radiation-Hard Detectors • As a solution to the radiation damage problem of HE Scintillators, we propose to use quartz plates. • Quartz plates will not be affected by high radiation, but with quartz the light is from Cerenkov radiation. • The Challenge: To develop a highly efficient method for collecting Cerenkov light in quartz. • With the quartz plates, we propose to collect photons in the range from 400 to 200 nm and re-radiate them as blue at ~420 nm. F. Duru, U of Iowa, HCAL Fall Meeting at Fermilab, 11/13/04

  3. What do we have so far.. • Original HE Tiles along with waveshifting fibers • UVT Plates from GE Polymershapes Cheaper, same refractive index as quartz, easy to machine. We purchased 2 thicknesses: 3mm – 6mm. Put keyhole shaped grooves, with different geometries. • Waveshifting fiber from Saint-Gobain We use UV absorbing, blue emitting waveshifting fibers to collect Cerenkov light from plates. • UV Reflecting material (Tyvek, or Mylar) to wrap the plates F. Duru, U of Iowa, HCAL Fall Meeting at Fermilab, 11/13/04

  4. What do we have so far.. • Quartz Tube filled with UV absorbing waveshifting fluid • Quartz Plates from Pacific Quartz Company We have 3 (6 x 200 x 200) mm GE quartz plates, UV cutoff at about 230nm. 1 tested at Fermilab (Aug. `04). • Grooved Quartz Plates from Polymicro • (2 x 100 x 100) mm quartz plates, arrived in Oct. `04 Grooved to hold fibers (3 shapes : Y, HE Geo, S) High OH (same material as HF quartz fibers!!) F. Duru, U of Iowa, HCAL Fall Meeting at Fermilab, 11/13/04

  5. Fiber Geometries on Plates HE Geometry S-Shape Y-Shape O-Shape S&O Shape PEACE Shape F. Duru, U of Iowa, HCAL Fall Meeting at Fermilab, 11/13/04

  6. 6mm UVT Plates F. Duru, U of Iowa, HCAL Fall Meeting at Fermilab, 11/13/04

  7. Tyvek/Light Sealed Plates F. Duru, U of Iowa, HCAL Fall Meeting at Fermilab, 11/13/04

  8. Tests Performed • At Cern - July `04 2 UVT plates: Y (3mm) and S+HE Geometries Combo 100 GeV electron beam • At Fermilab - August `04 6 different geometries, 2 different thickness of UVT, GE Quartz Plate has been tested. 120 GeV proton beam at 45 & 90 degrees. We used Hamamatsu R7525 PMT (regular HF PMT) • At the U of Iowa - August `04 – present Surface scans of all quartz plates with radioactive Sources Co60 (5μCu), Cs137 (7 mCu) F. Duru, U of Iowa, HCAL Fall Meeting at Fermilab, 11/13/04

  9. Test at Cern UVT plates, with 100 GeV electron beam… We saw the signal: 3mm S-shape + 3mm HE-geometry UVT Y-Shape, 3mm UVT, 100 GeV electron F. Duru, U of Iowa, HCAL Fall Meeting at Fermilab, 11/13/04

  10. Tests at FNAL We tested HE Scintillator, UVT Plates and GE-Quartz plate in M-Test area at FNAL, Aug`04, with 120 GeV Proton beam F. Duru, U of Iowa, HCAL Fall Meeting at Fermilab, 11/13/04

  11. Geant4 Simulations • We are simulating a hadron calorimeter with quartz and scintillating plates using Geant4 (Currently with LHEP physics list, QGSP will be done ,too): • GEANT4: C++ version of the detector simulation tool kit GEANT3. • LHEP: GEANT4 physics list constructed from parameterizations of data from experiments. • QGSP: GEANT4 physics list constructed from theoretical models. F. Duru, U of Iowa, HCAL Fall Meeting at Fermilab, 11/13/04

  12. Geant4 Simulations 19 Layers of 50mm Cu + 4mm Scintillator or Quartz Cerenkov photons on fixed angle 10 GeV Pion beam 1m x 1m Box F. Duru, U of Iowa, HCAL Fall Meeting at Fermilab, 11/13/04

  13. Geant4 Simulations • We also simulate the FNAL Test Beam • 10000 events for 6 different iron absorber thicknesses and two quartz plate thicknesses for: Proton and pion at 120GeV and • electron at 100 GeV. 3mm Quartz Plate 5mm Quartz Plate F. Duru, U of Iowa, HCAL Fall Meeting at Fermilab, 11/13/04

  14. Simulations • We also simulated 10000 events for scintillator. So far we used 120 GeV proton beam for three different absorber thicknesses. Scintillator thickness is 0.4cm. F. Duru, U of Iowa, HCAL Fall Meeting at Fermilab, 11/13/04

  15. Future plans • Fermilab test beam, Jan 2005 • New plates coming - Solarization plates “UV radiation <300nm degrades transmission in standard silica fibers resulting in solarization. Solarization resistant fiber maximizes UV throughput. UV – Visible (190 - 800 nm)” • 100 X 100 X 2mm high OH solarization plates • 100 X 100 X 2mm medium OH solarization plates • Radiation tests are performed on solarization fibers in Aug-Sep ’04, at Argonne. We don’t have the results yet… F. Duru, U of Iowa, HCAL Fall Meeting at Fermilab, 11/13/04

  16. Future plans • SLAC Test Beam, June 2005. • Surface scans continue at Iowa and Fairfield UV laser spot (i)Rayleigh Scattering, (ii)surface roughened spots on bottom, (iii) edge illumination • Geant4 simulations continue. • New quartz tubes and capillaries -20 cm long quartz tube, 1mm inner, 3mm outer radius, one end sealed, the other is open with waveshifting liquid in it. -Fairfield- core wavelength shifting liquids based on n=1.55 benzyl alcohol. - Liquid Chromatography Quartz Capillaries Core ID = 300 mm, Wall thick=20 mm - Flexible! F. Duru, U of Iowa, HCAL Fall Meeting at Fermilab, 11/13/04

  17. Future Plans (cont.) • New tech ideas: - We located new sapphire fibers producer • impurity dopants (ex: Ti) for WLS under consideration. Length 2-4m, NA 0.12 Core sizes 150, 250, 325 and 425 micrometer - ZnO(Ga) Fibers – Scintillator & WLS ZnO(Ga) rad-hard - used as phosphor 30% scint. ; Decay Constant 0.6 ns; l=375nm 1960’s ZnO fibers competed w/ glass fibers (GE, Corning, AT&T) F. Duru, U of Iowa, HCAL Fall Meeting at Fermilab, 11/13/04

  18. Future Plans (cont.) • New tech ideas (cont): - Porous Alumina (boehmite) Cladding (high NA) 50 nm pores; 85% air, n=1.31, rad-hard Formed by proper anodization of thin Al films Can be used as cladding on quartz or plastic - Impurity Dopants for Quartz Fiber WLS Ti - see U. Miss - L.Cremaldi - Methods to pull plastic WLS fibers through Quartz Plates F. Duru, U of Iowa, HCAL Fall Meeting at Fermilab, 11/13/04

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