(Helmholtz-Zentrum Berlin für Materialien und Energie) At the BESSY II storage ring, a team has shown how the helicity of circularly polarized synchrotron radiation can be switched faster – up to a million times faster than before. They used an elliptical double-undulator developed at HZB and operated the storage ring in the so-called two-orbit mode. This is a special mode of operation that was only recently developed at BESSY II and provides the basis for fast switching.

Original source: https://www.eurekalert.org/pub_releases/2020-04/hbfm-biu040120.php