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TY - CPAPER AU - Vélez, A.V. AU - Glock, H.-W. AU - Goslawski, P. AU - Jankowiak, A. AU - Knobloch, J. AU - Neumann, A. AU - Ries, M. AU - Wüstefeld, G. TI - BESSY VSR: A Novel Application of SRF for Synchrotron Light Sources J2 - Proc. of International Conference on RF Superconductivity (SRF2015), Whistler, BC, Canada, Sept. 13-18, 2015 AB - CW SRF Cavities have been used very successfully in the past in synchrotron light sources to provide high power acceleration. Here we present a novel application of higher harmonic systems of two frequencies (1.5 GHz and 1.75 GHz) to generate a beating of accelerating voltage. With such a system it is possible to store "standard" (some 10 ps long) and "short" (ps and sub-ps long) pulses simultaneously in the light source. This opens up brand new possibilities for light source users to perform dynamic and high-resolution experiments at the same facility. The demands on the SRF system and RF control are substantial and a new design, based on waveguide damping, is currently being developed. This system will be used for a major upgrade of the BESSY-II facility to the BESSY Variable Pulse Storage Ring (BESSY-VSR) for a next-generation storage-ring light source. We will discuss the concept, challenges and designs for BESSY-VSR. PB - JACoW CY - Geneva, Switzerland SP - 462 EP - 466 KW - cavity KW - damping KW - SRF KW - HOM KW - storage-ring DA - 2015/12 PY - 2015 SN - 978-3-95450-178-6 DO - 10.18429/JACoW-SRF2015-TUAA03 UR - http://srf2015.vrws.de/papers/tuaa03.pdf ER -