The Event Plane Detector (EPD) is an upgrade to the STAR experiment. It is similar to the Beam Beam Counter (BBC) which has been a part of the STAR experiment since the beginning, but will provide more pseudorapidity coverage ($2.2<|\eta|<5.1$ compared to $3.3<|\eta|<5.0$) and higher granularity (744 distinct channels compared to 32), leading to an increase in first-order event plane resolution by a factor of at least 1.5. Additional benefits from the EPD include TPC-independent centrality determination and event planes at BES energies where the VPD and ZDC suffer from low occupancies. The EPD is a set of disks consisting of 1.2cm-thick scintillator tiles optically isolated with reflective epoxy and embedded with wavelength-shifting fibers held in place with optical epoxy which are coupled to Silicon photomultipliers via clear fiber optics. The detector was constructed in $2\pi/12$ azimuthal sections called supersectors, each of which were tested for tile quality with cosmic rays and tile crosstalk with a radioactive source. In this poster, I will discuss the process of constructing the supersectors that make up the disks as well as the multiple tests performed on the finished supersectors to characterize their quality.
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