deletions | additions       diff --git a/Longitudinal Polarization Experiments.tex b/Longitudinal Polarization Experiments.tex  index 5482caa..3d10c65 100644  --- a/Longitudinal Polarization Experiments.tex  +++ b/Longitudinal Polarization Experiments.tex 
...
Movable spin rotators as designed for HERA~\cite{cite:HERA-beams} would therefore allow a program of longitudinal longitudinally  polarized beams at the Z peak. (The spin rotator design foreseen for LEP requires tilting the experiments and is unpractical for TLEP.) For the same level of polarization in collisions as that observed at LEP, and assuming that a fraction of the bunches can be selectively depolarized, a simultaneous measurement~\cite{Blondel:1987wr} of the beam polarization and of the left-right asymmetry $\ALR$ can be envisioned at TLEP. Polarization wigglers, such as those described for LEP in Ref.~\cite{cite:Blondel-Jowett-LEP606}, will be used at TLEP to establish such levels of polarization. Indeed, the natural polarization building time amounted to five hours at LEP, and is predicted to increase like the third power of the ring bending radius. Without polarization wigglers, the natural polarization building time would be nearly 150 hours. The impact of the polarization wigglers on the maximum achievable luminosity will need to be studied.