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Description
Synchrotron radiation emitted by electrons and positrons passing through a bending dipole magnet provides a key signature for ensuring beam purity in the CERN SPS beam lines. Synchrotron radiation is emitted tangentially to the particle trajectory, and its intensity scales with particle energy. This makes uniform light collection essential for the detector, especially for low energy $e^{\pm}$. In this work, we present a Synchrotron Radiation Detector (SRD) composed of an 8$\times$12 matrix of LYSO crystals, each measuring 4$\times$4$\times$45 $mm^3$, a light guide and an R7600U photomultiplier tube (PMT). The light collection uniformity was measured using a cell by cell scanning setup, in which the center of the 4$\times$4 $mm^2$ face of each crystal was scanned with a reference counter composed of a $^{22}\mathrm{Na}$ source, a tungsten collimator, a $\mathrm{LaBr}_3\mathrm{:Ce}$ crystal, and an R3998-PMT. The SRD light collection uniformity was determined from the 511 keV photopeak measured in the reference counter. The measured light collection variation is within 5%.
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