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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 15: Beam Dynamics / Simulation III

AKBP 15.3: Vortrag

Donnerstag, 12. März 2015, 17:15–17:30, F.10.01 (HS 4)

Influence of Transient Beam Loading on the Longitudinal Beam Dynamics at BESSY VSR — •Martin Ruprecht¹, Paul Goslawski¹, Andreas Jankowiak¹, Markus Ries¹, Godehard Wüstefeld¹, and Thomas Weis² — ¹Helmholtz-Zentrum Berlin, Germany — ²Technische Universität Dortmund, Germany

BESSY VSR, a scheme where 1.5 ps and 15 ps long bunches (rms) can be stored simultaneously in the BESSY II storage ring has recently been proposed[1]. The strong longitudinal bunch focusing is achieved by superconducting high gradient RF cavities. If the fill pattern exhibits a significant inhomogeneity, e.g. due to gaps, transient beam loading causes a distortion of the longitudinal phase space which is different for each bunch. The result are variations along the fill pattern in synchronous phase, synchrotron frequency and bunch shape. This paper presents investigations of transient beam loading and depicts the consequences on bunch length, phase stability and longitudinal multi-bunch oscillations for the projected setup of BESSY VSR.

[1] G. Wüstefeld, A. Jankowiak, J. Knobloch, M. Ries, Simultaneous Long and Short Electron Bunches in the BESSY II Storage Ring, Proceedings of IPAC2011, San Sebastián, Spain