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TY - CONF AU - Vélez, A.V. AU - Glock, H.-W. AU - Glöckner, F. AU - Hall, B.D.S. AU - Knobloch, J. AU - Neumann, A. AU - Schnizer, P. AU - Sharples, E. AU - Tsakanian, A.V. ED - Schaa, Volker RW ED - He, Yuan ED - Li, Lu ED - Zhao, Ning TI - BESSY VSR: SRF Challenges and Developments for a Variable-pulse Length Next-generation Light Source J2 - Proc. of SRF2017, Lanzhou, China, July 17-21, 2017 C1 - Lanzhou, China T2 - International Conference on RF Superconductivity T3 - 18 LA - english AB - The BESSY VSR project represents an exciting alternative to diffraction limited storage rings in the development of a next generation light source. Such a system should be capable to store "standard" (some 10 ps long) and "short" (ps and sub-ps long) pulses simultaneously in the storage ring opening the door to picosecond dynamic and high-resolution experiments at the same facility. This unique feature can be created by the introduction of the beating effects produced by higher harmonic SRF cavity systems (1.5 GHz & 1.75 GHz). The challenging design specifications as well as the technological demands on the SRF system make BESSY VSR a defiant project where non-standard techniques such as waveguide-damped cavities have been further developed. This talk focuses on the new SRF developments that includes wveguide-damped cavities, high-power couplers and higher-order mode absorbers that must handle nearly 2 kW of HOM power. The cryomodule design and its interaction with the beam will also be discussed. PB - JACoW CP - Geneva, Switzerland SP - 29 EP - 35 KW - ion KW - cavity KW - HOM KW - SRF KW - synchrotron DA - 2018/01 PY - 2018 SN - 978-3-95450-191-5 DO - 10.18429/JACoW-SRF2017-MOYA02 UR - http://jacow.org/srf2017/papers/moya02.pdf ER -