Speaker
Description
Short Touschek lifetime is a critical aspect of low emittance electron storage rings. To ensure an acceptable lifetime, many new machine designs rely on some kind of blowup of the vertical emittance. In view of the upgrade of the ALBA storage ring, it was decided to explore the possibility to use betatron coupling to increase the vertical emittance. To avoid the constrain of operating onto the resonant condition Qx=Qy, we use an AC skew quadrupole driven at the difference Resonance (Qx-Qy). Unlike other forms of vertical emittance blowup, this method generates a true transverse emittance sharing resulting in an increase of the vertical emittance and a reduction of the horizontal one, therefore mitigating the loss in performance due to the sole vertical emittance blowup. This presentation covers the underlying theory, the hardware implementation of the AC skew quadrupole system, and the experimental results obtained with the current ALBA beam.
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