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\subsection{Integrated luminosity measurement}  The experimental conditions at TLEP will be similar to those of LEP, with the additional bonus of very stable beam conditions thanks to brought by  the topping-up mode. continuous top-off injection.  Nevertheless, there will be a number of notable differences: a) the differences, as exemplified in turn below.   \begin{itemize}   \item The  smaller value of $\beta^*_y$ increases the beam divergence at the interaction point to the point where extent that  it may have a sizable sizeable  effect on the acceptance of low angle detectors used for the luminosity measurement; a') measurement.   \item The  strong final focus final-focus  quadrupoles may generate large amounts of synchrotron radiation radiation,  which needs need  to be simulated and against which appropriate shielding must be provided; b) an provided.   \item An  increased amount of beamstrahlung, which beamstrahlung  may lead to a somewhat larger background of electromagnetic radiation produced in the interaction region -- region. As mentioned earlied, it is however  several order of magnitude smaller however thanin  the level expected in a  linear collider environment; c) the environment.   \item The  repetition rate in multi-bunch operations can raise up to will reach  20 MHz and this at the Z pole. This specificity  has to be taken into account in the design of the detectors. Provided \end{itemize}     To  the above mentioned extent that the aforementioned  issues are properly addressed and solved, there should be no significant difficulty in achieving to achieve  luminosity measurements with an experimental precision similar to that obtained at LEP, typically a few times $10^{-4}$. At the Z peak it would be of interest (for interest, e.g., for  the measurement of the invisible width) width, hence the number of light neutrinos,  to achieve even better precisions, which will require a more precise construction of the luminometers. However, the The  main limitation on the luminosity measurement measurement, however,  would come, come  in the state of the art, art  from the theoretical calculation of the low angle Bhabha cross-section; clearly, cross section. Clearly,  progress in this aspect would pay great dividends.