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Patrick Janot edited Cost.tex
over 10 years ago
Commit id: 69b81bba20732180f5d7394d04f285f0b8152f51
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The length of the tunnel will be optimized on the basis of geological and accessibility criteria. For example, a tunnel of 100 km (shown in Fig.~\ref{fig:TLEP80}) might
not be more
expensive cost-effective than the 80-km version, the price estimate of which is given in Table~\ref{tab:cost}. Indeed, a 100-km tunnel may avoid the limestone areas in the vicinity of the Sal\`eve mountain (more difficult to dig), and might not require digging either challenging 1-km-deep shafts or a 30-km bypass tunnel needed to access the caverns underneath the Sal\`eve mountain (as shown in Fig.~\ref{fig:Profile80}, taken from Ref.~\cite{cite:Osborne}). With such a tunnel, the physics case would be enhanced with a 20\% larger luminosity at all centre-of-mass energies, and it would be possible to increase the maximum centre-of-mass energy by 5\% with the same RF voltage, should there be an interest to do so. A feasibility assessment for the 100-km version of the TLEP tunnel is ongoing.