Tsakanian, A.; Flisgen, T.; Glock, H.-W.; Velez, A.; Knobloch, J.: HOM Power Levels in the BESSY VSR Cold String. In: Shane Koscielniak ... [Ed.] : IPAC2018 : Proceedings of the 9th International Particle Accelerator Conference, Vancouver, BC, CanadaGeneve: JACoW, 2018. - ISBN 978-3-95450-184-7, p. WEPML048/2808-2811
http://accelconf.web.cern.ch/AccelConf/ipac2018/papers/wepml048.pdf
Open Access Version
Abstract:
The BESSY VSR upgrade of the BESSY II light source represents a novel approach to simultaneously store long and short bunches in the storage ring. This challenging goal requires installation of four new SRF cavities (2x1.5GHz and 2x1.75GHz) in one module for installation in a single straight. These cavities are equipped with strong waveguide HOM dampers necessary for stable operation. The expected HOM power and spectrum has been analyzed for the complete cold string. The cold string is a combination of various elements such as SRF cavities, bellows with and without shielding, warm HOM beam-pipe absorbers and UHV pumping domes. The presented study is performed for various BESSY VSR bunch filling patterns with 300 mA beam current. The contribution of each component to the total HOM power is presented.