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Quartz Plate R&D Status

Quartz Plate R&D Status. F. Duru, S. Ayan, U. Akgun, J. Olson, A. Albayrak, Y. Onel The University Of Iowa V.Podrasky, C. Sanzeni, D.R.Winn Fairfield University L. Cremaldi, E. Ellison The University of Mississippi. Summary of last presentation….

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Quartz Plate R&D Status

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  1. Quartz Plate R&D Status F. Duru, S. Ayan, U. Akgun, J. Olson, A. Albayrak, Y. Onel The University Of Iowa V.Podrasky, C. Sanzeni, D.R.Winn Fairfield University L. Cremaldi, E. Ellison The University of Mississippi HCAL Fall Meeting 10/15/2005, Fermilab

  2. Summary of last presentation… • We tested UVT and Quartz plates, UV absorbing wavelength shifting fibers and liquids. Also, wrapping materials: Tyvek and Al-Mylar . • July’04 @ CERN • Aug’04 @ Fermilab • Jan’ 05 @ Fermilab • Cerenkov light collected from quartz plates with WLS fibers reached 25% of regular HE plates. Low-OH Polymicro solarization quartz is our choice over high-OH Polymicro. Peace fiber geometry collected light more efficiently. Small plate size is better. HCAL Fall Meeting 10/15/2005, Fermilab

  3. From last presentation… • GE-Quartz should be compared to Polymicro. • Radiation damage tests need to be done. • Surface scan studies should be completed. • Liquid WLS with quartz capillaries need to be investigated. Should work on new quartz tubes and capillaries. • Salycylic Acid was used as wavelength shifter with GE-Quartz. Pterphenyl needs to be investigated as a WLS material to increase light. HCAL Fall Meeting 10/15/2005, Fermilab

  4. Radiation Damage Studies • Seven sets of quartz in the form of fiber are irradiated in Argonne IPNS for 313 hours. • The fibers were tested for optical degradation before and after 17.6 Mrad of neutron and 73.5 Mrad of gamma radiation. REM Hole Diagram Test Setup HCAL Fall Meeting 10/15/2005, Fermilab

  5. Radiation Damage Studies • Low OH solarization quartz is a better UV transmitter than High-OH quartz. • Polymicro manufactured a special radiation hard solarization quartz plate. Radhard Solarization Quartz Regular Solarizarion Quartz HCAL Fall Meeting 10/15/2005, Fermilab

  6. Surface Uniformity Tests • We tested all quartz fiber geometries for surface light collection non-uniformities with UV-LED (380nm), Nitrogen Laser(337nm), and Mercury lamp. 360nm & 405nm HCAL Fall Meeting 10/15/2005, Fermilab

  7. Surface Uniformity Tests • S-Shape gives more uniform signal. • All the others have a surface nonuniformity around 60%. HCAL Fall Meeting 10/15/2005, Fermilab

  8. UV Reflective Material Tests • We tested Aluminized Mylar, German Mylar, HEM, and Tyvek. • Only Aluminized-Mylar and Tyvek are UV-sensitive. • Aluminized-Mylar is ~7 times better reflective material then Tyvek. HCAL Fall Meeting 10/15/2005, Fermilab

  9. ptp + wrapper fiber quartz Univ. of Mississippi Tests • Pterphenol (PTP) is a fast WLS and Scintillator (~1ns). • Quartz plates can be wrapped in foil+ptp wrappers. Or ptp can directly be deposited on quartz plates. • Radiation tests in progress. • Making test beam plans for CERN 2006. HCAL Fall Meeting 10/15/2005, Fermilab

  10. quartz 1 pe Scintillation (95%) + wls (5%) ADC COUNT (1/4pC/count) Pterphenol Tests • Pterphenol crystals placed between quartz and Tyvek. A large light enhancement is seen. • Additional light yield dominated by PTP scintillation property. • PTP must be tested for radiation hardness - optimistic. Sr90 Quartz + PTP Only Quartz PTP-on-Tyvek Quartz ¼” RCA8854 BlueEnhanced HCAL Fall Meeting 10/15/2005, Fermilab

  11. scintillation vial MCA PMT PMT Counter light enclosure PTP Radiation Tests • Dry PTP samples are mixed in Toluene. A liquid C14 source is dissolved into the vial. • The scintillation vial is inserted into a scintillation counter/MCA and rates recorded vs dose. • Cs137 source ~1.5 MRad/dy. (Mississippi). • Neutron irradiations being set up IPNS @ Argonne. • Protons @ IUCF - Indiana Cyclotron. (20MRad ~ 5e14 n/cm2 ) HCAL Fall Meeting 10/15/2005, Fermilab

  12. Toluene + PT + C14 150973 / 100s 0 MRad Cs137  beta spectrum Toluene + PTx + C14 152274 / 100s 15 MRad Cs137  PTP Radiation Tests No difference 156 KeV C14 Beta Spectrum @ 15MRad HCAL Fall Meeting 10/15/2005, Fermilab

  13. Fairfield University Studies • Liquid Core WLS Quartz Capillaries0.8mm OD, 0.7 mm ID, 25 mm coatingBenzyl Alcohol and POPOP WLS • Top 2 – 0.65 mm quartz “plugs” in the endsbottom 2 – quartz “cup” 0.85mm ID, 1.1 mm OD capped ends HCAL Fall Meeting 10/15/2005, Fermilab

  14. Quartz Capillary Properties • 50-75 mm wall thicknesses, 0.5-3 mm ID • Kapton, polyimide buffer coatings • Liquid Cores: Benzyl Alcohol (n~1.55 -most tests), Methylnaphthalene (n~1.61) • WLS at present limited to PPO, POPOP, bisMSB (for simplicity) • Ends plugged with: “plugs” or “caps” from fused quartz; plugs held at present with few microns of optical epoxy. HCAL Fall Meeting 10/15/2005, Fermilab

  15. Plastic & Quartz Capillaries • Maximum length of liquid core fibers produced = 2.8 m (limited by ceiling height) • Filling uses vertical vacuum/liquid column, then hand plugging • Bubbles (compromises in rig) prevent full measurements (limited by size of bath tray for hand plugging) HCAL Fall Meeting 10/15/2005, Fermilab

  16. Numerical Aperture Rig • Laser external injection or WLS Capture • Measures input, output light cone angles and intensities • Stepper motor settable; PMT or cooled Si • Clear Test Fiber – manufacturer quotes N.A.=0.60External Laser Injection . Measured N.A.= 0.62 +/- 0.02(fraction transmitted vs sin angle) HCAL Fall Meeting 10/15/2005, Fermilab

  17. WLS Liquid Core Quartz CapillaryN.A.~ 0.26 by Ext. Injected laser LightAsymmetry from canted endplug~ 2-3 degrees off perpendicular by micro-inspection UV Stimulated->visible WLS LightUV laser illumination perpendicular to fiberWLS Liquid Core Quartz CapillaryN.A. = 0.23, by trapped WLS light Varying distance of UV spot along fiber: <5% variation xmitted intensity over a distance of 6-30 cm from fiber end (large effect 1<d<5 cm) Quartz Capillaries HCAL Fall Meeting 10/15/2005, Fermilab

  18. Quartz Capillary Summary • WLS liquid core fibers with robust cladding demonstrated • Measured N.A. and capture consistent with core, cladding refractive indices • Observed attenuation of WLS trapped light less than 5% over ~1 foot lengths • Simple fill methods need some improvement • Endplugs need refinement • Need more UV transparent or no buffer HCAL Fall Meeting 10/15/2005, Fermilab

  19. Future Plans • Every institution will continue with their local tests. • We are ready for the next step : “Quartz Plate Calorimeter Prototype” Geant4 simulation of 50 GeV electron with a 50mm copper absorber, 5 mm quartz plate prototype calorimeter. HCAL Fall Meeting 10/15/2005, Fermilab

  20. Planning & Simulations until Jan’06 Construction end of Feb’06 Fermilab Test Beam March’06 Cern Test Beam Summer 06. Quartz Plate Calorimeter Prototype Geant4 simulation of 25 GeV pion with a 50mm copper absorber, 5mm quartz plate prototype calorimeter. HCAL Fall Meeting 10/15/2005, Fermilab

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