Quartz Plate R

1
Quartz Plate RD 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

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 .
• July04 _at_ CERN
• Aug04 _at_ Fermilab
• Jan 05 _at_ 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.

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.

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
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
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
7
Surface Uniformity Tests

• S-Shape gives more uniform signal.

• All the others have a surface nonuniformity
  around 60.

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.

9
Univ. of Mississippi Tests

• Pterphenol (PTP) is a fast WLS and Scintillator
  (?1ns).
• Quartz plates can be wrapped in foilptp
  wrappers. Or ptp can directly be deposited on
  quartz plates.
• Radiation tests in progress.
• Making test beam plans for CERN 2006.

10
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
11
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 _at_
  Argonne.
• Protons _at_ IUCF - Indiana Cyclotron. (20MRad
  5e14 n/cm2 )

12
PTP Radiation Tests
No difference
156 KeV
C14 Beta Spectrum _at_ 15MRad
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

14
Quartz Capillary Properties

• 50-75 mm wall thicknesses, 0.5-3 mm ID
• Kapton, polyimide buffer coatings
• Liquid Cores Benzyl Alcohol (n1.55 -most
  tests), Methylnaphthalene (n1.61)
• 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.

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)

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)

17
Quartz Capillaries

• 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-gtvisible 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 lt5
  variation xmitted intensity over a distance of
  6-30 cm from fiber end (large effect 1ltdlt5 cm)

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

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.
20
Quartz Plate Calorimeter Prototype

• Planning Simulations until Jan06
• Construction end of Feb06
• Fermilab Test Beam March06
• Cern Test Beam Summer 06.

Geant4 simulation of 25 GeV pion with a 50mm
copper absorber, 5mm quartz plate prototype
calorimeter.