Beam density manipulations in the ELETTRA storage ring

Low energy third generation light sources, such as ELETTRA, are lifetime limited by Touschek scattering. In principle an improvement of the lifetime can be obtained by increasing the emittance coupling or by increasing the longitudinal bunch dimensions, however, both methods have an adverse effect on the light quality. The trade off between lifetime and light quality in ELETTRA is discussed and spectral measurements for various scenarios are presented