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Kuske, P.

Paper Title Page
WOAC003 Effects of Fringe Fields and Insertion Devices Revealed Through Experimental Frequency Map Analysis 266
 
  • P. Kuske
    BESSY GmbH, Berlin
 
  Funding: This work was supported by the Bundesministerium für Bildung und Forschung and by the Land Berlin.

Following the pioneering work at the ALS* frequency map analysis was performed at the light source BESSY. With altogether 7 families of sextupole magnets available in the storage ring, amplitude dependent tune shifts can be made rather small. Therefore, the impact of fringe fields of dipole and quadrupole magnets as well as systematic octupole and decapole field components of the quadrupole and sextupole magnets used in addition as horizontal, vertical and skew gradient correctors are clearly visible in the measured maps. Insertion devices with their known systematic and usually unknown random non-linear field components impact the appearance of the frequency maps even more strongly. In the talk the current status of the experiments as well as the results of the theoretical modeling will be presented.

*"Global Dynamics of the Advanced Light Source Revealed through Experimental Frequency Map Analysis," D. Robin, et al., Phys. Rev. Lett. 85, 558 (2000).

 
RPAE035 Orbit Stability at BESSY 2366
 
  • R. Müller, J. Feikes, K. Holldack, P. Kuske
    BESSY GmbH, Berlin
 
  Funding: Funded by the Bundesministerium für Bildung und Forschung and by the Land Berlin.

Traditionally intrinsic component stability as well as perturbation source identification and suppression (like set-up modifications or feed-forward compensations) have been the preferred methods used to guarantee beam orbit stability for user operation at BESSY. Second focus of activity is the reliability of slow drift control and the high degree of beam position reproducibility maintained under frequently changed operation conditions. Along these lines an overview of the measures taken, the available diagnostic means as well as the achievements and shortcomings of the existing slow orbit feedback is given. Diagnostic capabilities of a fast BPM read-out and data distribution system give insight into the demands on a fast orbit feedback that could provide better operation flexibility and improved performance.