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Fiber Attenuation Length Test for MINER v A

This study focuses on measuring the attenuation length of Wave Length Shifting (WLS) fiber for MINERvA. Various types of fibers were tested using the MINOS Fiber Scanner to determine their light yield and attenuation length. The results showed that the multi-cladding and S-type fibers had higher trapping efficiency and were stronger against bending. Mirrored fibers were also measured and compared with previous reflectivity data. Further analysis and investigation are needed to address systematic errors and discrepancies observed.

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Fiber Attenuation Length Test for MINER v A

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  1. Fiber Attenuation Length Test for MINERvA Jaewon Park University of Rochester Jupiter/MINERvA Meeting, Sep 10, 2005

  2. Introduction • Attenuation length of Wave Length Shifting (WLS) fiber was measured 2004 summer • Types of fiber / Tested fibers • MINOS Fiber Scanner • Light yield, Attenuation length • 175ppm/300ppm, mirrored/unmirrored

  3. Outer Cladding Inner Cladding Core Types of Fiber • Single Cladding / Multi Cladding • Multi cladding has higher trapping efficiency • Non-S type / S type • S type is stronger against bending • Wave Length Shifting (WLS) Fiber • Type of Dye: Y7 / Y8 / Y11 • Dye concentration: 150ppm / 200ppm • Diameter: 1.2mm, 1.5mm • Smaller diameter fiber is easier to bend

  4. Tested Fibers • Kuraray, Multi Cladding, S type, Y11 • 150ppm, 1.2mm (out of old batch, measured but poor quality) • 175ppm, 1.2mm • 300ppm, 1.2mm • 175ppm, 1.2mm, mirrored • 300ppm, 1.2mm, mirrored • Some of mirrored fibers were measured after cutting mirror again

  5. List of Data Mirrored fiber data

  6. MINOS Fiber Scanner • Hamamatsu R580-17 PMT • Sr90 source Scintillator bar PMT Light Mixer Ferrule WLS fiber

  7. Relative Light Yield • 300ppm has higher light yield at d=0cm

  8. Attenuation Length • Remained fraction of light at d=318cm (i.e. shape of curve)

  9. Mirrored Fibers • Small sample size (two of each type)

  10. Comparison with Previous Reflectivity • Maybe need to make correction to old data

  11. Fit values • Fitted value from mirrored fiber can be used to extrapolate other values f(x) = A1*Exp(-x/L1) + A2*Exp(-x/L2)

  12. More Thing To Do • Try to fit mirrored double exponential curve • Compare mirrored fiber data and other data • Two results are obtained by different code • Check consistency • Estimate systematic error • Some discrepancy seem to rise from PMT gain shift

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