Design of a diffraction limited light source (DIFL)

Three synchrotron light source of the third generation have been commissioned (ESRF, ALS and ELETTRA). All machines have reached their target specifications without any problems. Hence it should be possible to run light sources with a smaller emittance, higher brilliance and emitting coherent radiation. A first design of a Diffraction Limited Light Source has been performed. It is a 3 GeV storage ring with a modified multiple bend achromat (MBA) optics as a lattice leading to a normalized emittance of ε_X=0.5 nmrad. The novel feature of this lattice is the use of horizontally defocussing bending magnets with different bending angles to keep the radiation integrals low. The circumference is 400 m including 12 straight sections with a length of 6 m. The dynamical behaviour should allow to store a beam of 100 mA with a lifetime larger 5 hours