Ruprecht, M.; Goslawski, P.; Jankowiak, A.; Neumann, A.; Ries, M.; Wüstefeld, G.; Weis, T.: Influence of Transient Beam Loading on the Longitudinal Beam Dynamics at BESSY VSR. In: S. Henderson ... [Ed.] : Proceedings of IPAC2015, Richmond, VA, USAJACoW, 2015. - ISBN 978-3-95450-13, p. MOPWA022/141-143
http://accelconf.web.cern.ch/AccelConf/IPAC2015/papers/mopwa022.pdf
Open Access Version
Abstract:
BESSY VSR, a scheme where 1.7 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 bunch 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 fre- quency 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.