source: Backup NB/Talks/MEMPHYSetal/SPLFrejusArt/SPLFrejus/CommentFromMaoraM.tex @ 392

1) Particle production yields are summarized in table 2. The pion energy spectra obtained at different energies and normalized to a 4MW SPL beam power, are presented in figure X.


2) One notices that for $\epsilon_{syst} = 5\%$ there is no difference between a $3.5$~GeV or a $4.5$~GeV beam.  The inflance of the systematics is presented on figure 14 for a $4.5$~GeV beam.

3) With a $3.5$~GeV SPL energy beam, in 5 years of focusing positive particles, one can reach a minimum value of $\sin^22\theta_{13} = 9.6\times 10^{-4}$ ($90\%$ CL, $\delta_{CP} = 0$) and realizes a $20\%$ gain compared to the up to now nominal $2.2$~GeV SPL energy beam. If one includes a mixed focusing scenario, to explore the ($\sin^22\theta_{13}$,$\delta_{CP}$) sensitivity, then the $\delta_{CP}$-independant $\sin^22\theta_{13} = 2.1\times 10^{-3}$ ($90\%$ CL) minimum value that may be reached with a $3.5$~GeV energy beam is $12.5\%$ better than the value that may be reached with a $2.2$~GeV beam. 

This may be the sign that a $3.5$~GeV SPL beam energy design is to be investigated from the machine development and cost implication point of view.