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Use of Wavelength Shifter to Enhance Cerenkov Light Detection Art McDonald PowerPoint Presentation
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Use of Wavelength Shifter to Enhance Cerenkov Light Detection Art McDonald

Use of Wavelength Shifter to Enhance Cerenkov Light Detection Art McDonald

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Use of Wavelength Shifter to Enhance Cerenkov Light Detection Art McDonald

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  1. Use of Wavelength Shifter to Enhance Cerenkov Light Detection Art McDonald SNO Institute, Queen’s University Kingston, Ontario, Canada

  2. D2O D2O + WLS How It Works - SNO Acrylic Cutoff < 330 nm 2

  3. SNO OPTICS

  4. H2N O O O HO3S CH2 C O N CH3 O O HO O O CH2 C OH CH3 O carbostyril 124 Alexa Fluor 350 H H2N O N CH3 7-hydroxy-4-methylcoumarin 7-hydroxy-4-methylcoumarin-3-acetic acid HO O O C OH CH3 O 7-hydroxycoumarin-3-carboxylic acid HO O O CH3 Wavelength Shifters Tested Found to Require ph > 9, discarded

  5. WLS candidates Xin Dai Xin Dai 6

  6. Further tests Long Term Stability: < 5% change in emission over 6 months testing for Carbostyril and Alexa Fluor Increased output: Calculated factor of > 2 increase in detectable Cerenkov light for Carbostyril. Timing: Fluorescence Lifetime of 5.6 ns for Alexa Fluor and 6.2 ns for Carbostryil. Calculated attenuation length: Greater than 40 meters for wavelengths > ~ 400 nm Other effects: No interaction with acrylic or MnOx, Hydrous Titanium Oxide used for Radium measurements and purification. Removable with activated charcoal.

  7. Cerenkov Info still exists

  8. COST $ 7.2 Million for 1 ppm In 10 Megaton module

  9. Tests at TRIUMF for JPARK to SK Near Detector Mostly Electrons

  10. X 2.2 at 10 ppm x 1.8 at 1 ppm

  11. Future Measurements at TRIUMF • Other wavelength shifters – Alexa Fluor 350, 4-methyl umbelliferone • Attenuation lengths • Winn-Raftery water-based scintillator

  12. Other Ideas for the future … Tailored Nanocrystals for wavelength shifting or water-based scintillation??? At < 5 nm size and < 1% loading, Rayleigh scattering could be manageable.