Automatic luminosity optimization of the ILC head-on beam delivery system

With the local chromaticity correction scheme [1], the luminosity optimisation of the e+e- International Linear Collider (ILC) beam delivery system is challenging. It is a long and complex process and its automation becomes a necessity. It was recently shown that it is possible to employ a simplex minimization method of the beam sizes at the Interaction Point (IP) [2], without adding any other constraint on the beam line parameters. To achieve this goal, we have developed a minimization code which uses analytical computations of the IP beam sizes based on the high order transport coefficients calculated by the codes TRANSPORT [3]. We also use the code TRACEWIN [4] which tracks a particle cloud and minimise the rms beam sizes at the IP to optimise the luminosity, and we compare the results.