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Frentrup, W.

Paper Title Page
TUPMN013 Dynamic Multipole Shimming of the APPLE Undulator UE112 941
  • J. Bahrdt, W. Frentrup, A. Gaupp, M. Scheer, G. Wuestefeld
    BESSY GmbH, Berlin
  The dynamic off axis field integrals of the BESSY UE112 are of the order of 3 Tmm. They reduce the dynamic aperture significantly which is not tolerable for top-up operation. The dynamic multipoles have successfully been shimmed for the elliptical mode using distributed Fe-shims. In the inclined mode the multipoles are minimized actively with rotatable permanent magnets which are adjusted dependent on gap and phase position. The dynamic properties of the unshimmed and the shimmed device have been simulated using an analytic model for the field description and a generating function algorithm for tracking.