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Quantum Efficiency Measurements of Extruded Scintillators and Optical Connectors Performance

This update presents the findings from the DHC elements testing task led by Dyshkant, Martin, and Rykalin. Measurements focused on the quantum efficiency (QE) of various extruded scintillators, including BC-408 and BCF-92. Our study explored the emission intensity against wavelength, fiber transparency, and the effects of fiber loop radius on performance. We present final results and suggest potential improvements for optimized scintillator design, with insights into machining techniques and reflective coatings that could significantly enhance performance at NIU.

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Quantum Efficiency Measurements of Extruded Scintillators and Optical Connectors Performance

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Presentation Transcript

  1. Update on DHC elements testing.Task force: A. Dyshkant, M.Martin, V. Rykalin V. Rykalin

  2. PMT for measurements

  3. PMT Quantum Efficiency

  4. Extruded scintillator,emission intensity versus wavelength.

  5. BC 408, emission intensity versus wavelength.

  6. BCF 92, absorption end emission versus wavelength

  7. Fiber transparency versus loop radius(V. Makeev measurements)

  8. Elements tested

  9. Hexagonal, machined at NIU, BC-408,1mm BCF-92, N=1.8 P.E.

  10. BC-404, 1cm thickness,1.2 mm fiber BCF 92 N=9.6 P.E. Reflective end

  11. Extruded MINOS,0.9 cm thickness, 1 mm BCF-92 N=3.7 P.E., two ends.

  12. Final results

  13. Possible improvements for NIU9 mm thickness,10 cm fiber active length • Deeper grooving ~ 1.3 • Reflective coating ~ 1.5 • Machining optimization ~ 2-4 • VLPC QE=60% ~ 4 • MRS 30% ~ 2 • TOTAL (VLPC) 15.6 -31.2 P.E. TOTAL (MRS) 7.8 -15.6 P.E. • After attenuation and optical connectors ~ 4 times less

  14. VLPC, 0.9 cm, 2 optical connectors, 0.5 mm fiber BCF-92 N=6 P.E.

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