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

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Presentation transcript:

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

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

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 Core Inner Cladding Outer Cladding

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

List of Data ppm K300m12.001K300m12.301K300c K300m12.002K300m12.302K300c K300m K300m ppm K175m12.001K175m12.301K175c K175m12.003K175m12.303K175c K175m Jun-18/20July-14/ ppm k300_12.000k300_12.10a k300_12.001k300_12.10b k300_12.30bk300_12.40b k300_ k300_ k300_12.004k300_12.10e k300_12.30ek300_12.40e k300_12.005k300_12.105k300_12.705k300_ k300_12.006k300_ k300_ ppm k175_12.000k175_ k175_ k175_12.001k175_ k175_ k175_12.002k175_ k175_12.003k175_ k175_12.004k175_ k175_12.005k175_ Mirrored fiber data

MINOS Fiber Scanner Hamamatsu R PMT Sr90 source Light Mixer PMT Ferrule Scintillator bar WLS fiber

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

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

Mirrored Fibers Small sample size (two of each type)

Comparison with Previous Reflectivity Maybe need to make correction to old data

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

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