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\subsection{Beamstrahlung}  Beam backgrounds, pileup, Beamstrahlung is an issue for $\epem$ circular colliders, as its effects may cause the  beam energy spectrum lifetime to be unacceptably small. Solutions to as it can become a source of massive particle losses due to the high beam crossing rate. If these losses can be controlled to stabilize the beam lifetime around 15 minutes, for example by increasing the momentum acceptance of the optics to a couple per cent or with more exotic schemes like beam compensation,