Open Access, Copyright CERN, for the benefit of the CLICdp Collaboration. Article funded by SCOAP 3 .

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Synchrotron radiation (SR) reflction is an important issue for future linear colliders. High fluxes of SR might impact the performance of the detector, through irradiation of the forward luminosity and beam quality calorimeters or of the innermost layers of the vertex detector. The photon reflections depend on the beam pipe apertures' size, their shape, and materials used with various surface roughness. In this work, we present a study of SR including reflection for the 380GeV and 3 TeV beam parameters and optics of the Compact Linear Collider's Final Focus System. The simulations of the SR reections using the Synrad+ software are presented and the impact on the detector is discussed.

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