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TY - CONF AU - Neumann, A. AU - Burrill, A. AU - Goslawski, P. AU - Jankowiak, A. AU - Knobloch, J. AU - Ries, M. AU - Ruprecht, M. AU - Vélez, A.V. AU - Wüstefeld, G. ED - Petit-Jean-Genaz, Christine ED - Arduini, Gianluigi ED - Michel, Peter ED - Schaa, Volker RW TI - First Cavity Design Studies for the BESSY-VSR Upgrade Proposal J2 - Proc. of IPAC2014, Dresden, Germany, June 15-20, 2014 C1 - Dresden, Germany T2 - International Particle Accelerator Conference T3 - 5 LA - english AB - Recently HZB proposed an upgrade of the 3rd generation synchrotron light source BESSY II allowing simultanous long and short pulse operation*. For this scheme to work superconducting higher harmonic cavities of the fundamental 500 MHz at two frequencies need to be installed in the BESSY II storage ring. Given an appropiate choice of the higher harmonics the resulting gradient leads to a beating effect of the effective longitudinal focussing voltage at the stable fix points resulting in different bunch lengths in subsequent buckets. This project places stringent requirements on the cavity performance, as high accelerating fields, excellent HOM damping capabilities and high reliability as they will operate in a 300 mA 24/7 user facility. In this paper we describe the requirements for the cavity design and first designs steps. PB - JACoW CP - Geneva, Switzerland SP - 2493 EP - 2495 KW - cavity KW - HOM KW - damping KW - coupling KW - impedance DA - 2014/07 PY - 2014 SN - 978-3-95450-132-8 DO - 10.18429/JACoW-IPAC2014-WEPRI008 UR - http://jacow.org/ipac2014/papers/wepri008.pdf ER -