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\subsection{Beamstrahlung}  Beamstrahlung is an issue for $\epem$ rings, as its effects may cause the beam lifetime to become unacceptably small. Indeed, the repeated losses of even a tiny fraction of the beam at each collision rapidly add up because of the high beam crossing rate. Solutions to mitigate this effect (such as momentum acceptance increase, flatter beams, smaller emittances, larger top-off injection frequency, beam charge compensation) are proposed in Ref.~\cite{cite:1305.6498}. For illustration, Beamstrahlung effects are, however, benign for  the luminosities physics performance, because  of Fig.~\ref{fig:lumi} are obtained with a the  rather large vertical beam size (from 100 to 300nm) compared to what is needed at a linear collider (from 6 to 8  nm). As a consequence, beamstrahlung effects are benign for the physics performance of TLEP since For example,  the beamstrahlung-induced beam energy spread is expected to be smaller than 0.1\%, i.e., much smaller than the irreducible  spread of 2\% expected from initial state radiation (common to all $\epem$ colliders), radiation,  as shown in Fig.~\ref{fig:beamstrahlung} for $\sqrt{s}=240$ GeV.