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UBC Theses and Dissertations

Determination of the refractive index of the Black Sheet for the T2K experiment Sabouri, Shirin


“Black Sheet” is a thin layer of polyethylene terephthalate mixed with carbon. It is used as a light absorber surface in the inner structure of the Super-Kamiokande (SK) detector for the T2K experiment. To make a full event reconstruction in the SK detector, knowing the optical properties of the Black Sheet is required. Specifically, it is very important to know the complex refractive index as a function of the wave length of the incident light. In this thesis, the experimental results leading to the calculation of the refractive index of the Black Sheet for three different wave lengths are provided. The accuracy of the experiments is validated by testing two control samples. The results show that the real and imaginary parts of the refractive index of the control samples can be determined with tolerances of about 0.02 and 0.1 with 90% confidence level, respectively.

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