This thesis describes the experimental and theoretical basics of
free electron laser science, serving as an excellent introduction
for newcomers to this young field. Beyond that, it addresses
electron-beam lifetimes in third-generation synchrotron light
sources, in particular with a view to optimizing them in the
forthcoming ESRF upgrade. The lifetime of the electron beam in a
storage ring is a measure of how fast electrons are being lost, and
is thus an essential parameter determining the required injection
frequency, which in turn affects beam stability and power
consumption. The main limitation on the beam lifetime in these
synchrotron light sources is the Touschek effect, i.e. the single
scattering between two electrons in a bunch. In this thesis a model
able to predict the Touschek lifetime is presented. The model is
successfully tested against measurements and used to study the
influence of other parameters such as current and size of vacuum
chamber. Not least, it enables the settings of sextupole magnets to
be optimized.
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