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TY - CONF AU - Ruprecht, M. AU - Goslawski, P. AU - Jankowiak, A. AU - Ries, M. AU - Schälicke, A. AU - Weis, T. AU - Wüstefeld, G. ED - Petit-Jean-Genaz, Christine ED - Arduini, Gianluigi ED - Michel, Peter ED - Schaa, Volker RW TI - Analysis of Coupled Bunch Instabilities in BESSY-VSR J2 - Proc. of IPAC2014, Dresden, Germany, June 15-20, 2014 C1 - Dresden, Germany T2 - International Particle Accelerator Conference T3 - 5 LA - english AB - 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*. The strong longitudinal bunch focusing is achieved by superconducting high gradient RF cavities. This paper presents investigations of coupled bunch instabilities driven by HOMs of superconducting multi cell cavities in BESSY-VSR. Analytical calculations and tracking simulations in time domain are performed in the longitudinal and the transverse planes and factors that influence the threshold currents are being discussed. Suitable candidates of cavities which are presently available or in the phase of design are compared with respect to their instability thresholds. PB - JACoW CP - Geneva, Switzerland SP - 1659 EP - 1661 KW - HOM KW - cavity KW - feedback KW - damping KW - impedance DA - 2014/07 PY - 2014 SN - 978-3-95450-132-8 DO - 10.18429/JACoW-IPAC2014-TUPRI043 UR - http://jacow.org/ipac2014/papers/tupri043.pdf ER -