CONCLUSION

The described IDFF correction scheme has reached maturity and is routinely applied to all in-vacuum undulators at the SLS. The inclusion of XBPMs for EPUs and the electromagnetic undulators UE212 still requires further refinement. In conjunction with slow XBPM feedbacks which are an integral part of the FOFB sub-$\mu$m RMS photon beam stability has been achieved while the ID settings are varied at moderate speed.