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Hull, J.S.

Paper Title Page
THPLS079 Bunch Diffusion Measurements at the Advanced Light Source 3466
 
  • F. Sannibale, W.E. Byrne, C.-W. Chiu, J. Guo
    LBNL, Berkeley, California
  • J.S. Hull, O.H.W. Siegmund, A.S. Tremsin, J. Vallerga
    UCB, Berkeley, California
  
  In storage ring based synchrotron light sources, a long beam lifetime is usually a fundamental requirement for a high integrated brightness. The dynamic aperture and the momentum acceptance of lattices are carefully studied and maximized as much as possible for a long lifetime performance. On the other hand, large momentum acceptance and dynamic aperture increase the probability that a particle diffuses from one bunch to another. Diffusion can represent a severe limitation for those experiments where the samples have long relaxation times requiring empty buckets between bunches. At the Advanced Light Source (ALS) of the Lawrence Berkeley National Laboratory we have characterized the particle diffusion for the present lattice in order to evaluate its impact on a special user operation dedicated to these long relaxation time experiments and on the incoming top-off injection mode for the ALS.