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TY - CONF AU - Kaltenbacher, T. AU - Caspers, F. AU - Vollinger, C. ED - Eshraqi, Mohammad ED - Trahern, Garry ED - Schaa, Volker RW TI - Machine Element Contribution to the Longitudinal Impedance Model of the CERN SPS J2 - Proc. of HB2016, Malmö, Sweden, July 3-8, 2016 C1 - Malmö, Sweden T2 - ICFA Advanced Beam Dynamics Workshop on High-Intensity and High-Brightness Hadron Beams T3 - 57 LA - english AB - This contribution describes the current longitudinal impedance model of the SPS and studies carried out in order to improve, extend and update it. Specifically, new sources of impedances have been identified, evaluated and included in the model. One finding are low Q and low-frequency (LF; here below 1 GHz) resonances which occur due to enamelled flanges in combination with external cabling e.g. ground loops. These resonances couple to the beam through the gap with enamel coating which creates an open resonator. Since this impedance is important for beam stability in the CERN Proton Synchrotron (PS), RF by-passes were installed on the enamelled flanges, and their significance for the SPS beam is currently under investigation. Simulations, bench and beam measurements were used to deduce model parameters for beam dynamic simulations. PB - JACoW CP - Geneva, Switzerland SP - 71 EP - 75 KW - impedance KW - simulation KW - resonance KW - coupling KW - pick-up DA - 2016/08 PY - 2016 SN - 978-3-95450-185-4 DO - 10.18429/JACoW-HB2016-MOPR010 UR - http://jacow.org/hb2016/papers/mopr010.pdf ER -