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TY - CONF AU - Hwang, J.G. AU - Dürr, V. AU - Falkenstern, F. AU - Ries, M. AU - Schiwietz, G. AU - Schälicke, A. AU - Wolk, D. ED - Schaa, Volker RW ED - Jansson, Andreas ED - Shea, Thomas ED - Olander, Johan TI - A new button-type beam position monitor for BESSY II and BESSY VSR J2 - Proc. of IBIC2019, Malmö, Sweden, 08-12 September 2019 CY - Malmö, Sweden T2 - International Beam Instrumentation Conferenc T3 - 8 LA - english AB - The future BESSY VSR system involves more than one order-of-magnitude differences in the total charge of adjacent short and long bunches within the bunch train. Thus, any signal ringing beyond a nanosecond in time will cause a misreading of beam position and current, specifically for low bunch charges. This calls for improved performance for the bunch-selective operation of the beam-position-monitor (BPM) system. We report on the corresponding design and fabrication of a new button BPM with advanced features, such as impedance matching inside the button as well as optimization of insulator material, button size, and position, for reduced crosstalk between buttons. PB - JACoW Publishing CP - Geneva, Switzerland SP - 508 EP - 512 KW - impedance KW - vacuum KW - operation KW - storage-ring KW - resonance DA - 2019/11 PY - 2019 SN - 2673-5350 SN - 978-3-95450-204-2 DO - doi:10.18429/JACoW-IBIC2019-WEPP003 UR - http://jacow.org/ibic2019/papers/wepp003.pdf ER -