After more than a decade of operation, the Diamond Light Source (DLS) is planning an upgrade to the next generation of diffraction limited synchrotron light sources based on an ultra-low emittance accelerator lattice design. The optimisation of the photon beam properties like flux, brilliance and coherence of the light generated in the storage ring (SR), is a key driver for the storage ring design. The key performance parameters (KPP) characterizing the photon beamlines (BL) define the requirements on the electron beam and on the storage ring design. The storage ring design is supported by the development of optimisation tools that allow the simultaneous modelling of the photon and the electrons beams. A strategy has been developed to bridge the gap between storage ring lattice and beamline needs, based on an integrated approach of accelerator physics tracking codes (ELEGANT) and of radiation codes (SRW, SHADOW). Python is the interface for these codes. This thesis presents the integrated approach used to track electron beams and propagate the synchrotron radiation wavefronts through the beamline. The optimisation of the performance of the beamline is achieved by using multi-objective genetic algorithms. Such an integrated approach is new and promises to achieve the best exploitation of the beamlines, by tailoring the photon beams to the need of the applications.
