Lattices for light sources

This paper is intended to provide a guideline on how to design the lattice (i.e., the magnet arrangement) of a high brightness light source. In the introductory section we will consider the general framework to the design, clearify the steps of the design process and the interfaces to technical engineering, the lattice designer has to take into account. In the second section we will examine the lattice building blocks, i.e., the magnets. A short detour to magnet design will help to understand the limitations of magnet strength. An introduction to beam dynamics is not the subject of this paper, instead all relevant formula to understand subsequent sections are summarized in section three without any derivation. Section four focusses on emittance and how to build a lattice for obtaining low emittance. This is rst explained in a most intuitive way, then the theoretical minimum emittance and deviations from the minimum conditions are calculated in some details. The nal section dealing with the problem of acceptance considers the requirements for beam life time and injection ef ciency. Physical acceptances will be discussed in some details, whereas the large subject of dynamic acceptance optimization is subject of another lecture [25] and only brie y summarized here.