Touschek lifetime and RF voltage

Fig. 2 displays the Touschek lifetime, normalized to $\kappa$ = 0.1%, for the error free lattice in linear approximation according to eq.(1) and for the nonlinear optics in fixed-$\delta$-calculation as well as with synchrotron oscillation. Mini gaps were not yet set.

Already for the ideal lattice we see a strong reduction of lifetime, i.e. lattice MA (dynamic aperture), when including nonlinearities and synchrotron oscillation. Thus increasing the RF voltage beyond the planned 2.6 MV would gain only little in lifetime.

After introducing misalignments and closed orbit correction we observe large spread of different seeds and further ($\kappa$-normalized!) lifetime decrease, however after applying coupling suppression the ideal lattice values are restored and the spread from different seeds is compressed as shown for two voltage values in Fig. 2.