A Robinson Wiggler Proposal for the Metrology Light Source

The Metrology Light Source (MLS), situated in Berlin (Germany) is owned by the Physikalisch-Technische Bundesanstalt andwas built / is operated by theHelmholtz-Zentrum Berlin. It is an electron storage ring operating from 105MeV to 630MeV. The MLS serves as the national primary source standard from the near infrared to the extreme ultraviolet spectral region [1]. Users of synchrotron radiation demand an improved lifetime which is Touschek dominated at the MLS. A possible solution to meet this demand is to lengthen the electron bunches. By installing a Robinson Wiggler (RW), damping effects can be transferred from the longitudinal to the horizontal plane [2, 3], thereby increasing the energy spread and reducing the horizontal emittance. By varying the energy spread, the bunch length can be increased and thus the scattering rate decreased, resulting in an improved lifetime. According to preliminary estimations a considerable increase in lifetime seems achievable, while preserving the source size.