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TY - CONF AU - Tobiyama, M. AU - Ikeda, H. ED - Liu, Zhengzheng ED - Lidia, Steven ED - McCausey, Amy ED - Schaa, Volker RW TI - Turn-by-Turn Timing Systems for SuperKEKB Damping Ring Position Monitors J2 - Proc. of IBIC2017, Grand Rapids, MI, USA, 20-24 August 2017 C1 - Grand Rapids, MI, USA T2 - International Beam Instrumentation Conference T3 - 6 LA - english AB - Turn-by-turn timing systems for SuperKEKB beam position monitors using Xilinx Zynq FPGA have been developed. The RF frequency divider with external synchronization circuit creates a fiducial signal synchronized to the accurate injection timing from the injector event system. As the Log-Ratio turn-by-turn monitors (Digitex 18k11) need clock timing deviation to the beam signal within 8 ns, the cable length from the BPM heads to the detectors have been adjusted with the maximum deviation less than 1 ns using TDR. The time delay to adjust each cable lengths and the BPM placements have been created by using 32-ch RF timing delay with the step of 2 ns. The start trigger to the 18k11 has been made by using the digital delay (SRS DG645) from the injection trigger. The measured performance of the frequency divider, the 32-ch RF timing delay and start trigger system will be shown. PB - JACoW CP - Geneva, Switzerland SP - 221 EP - 224 KW - ion KW - timing KW - injection KW - FPGA KW - controls DA - 2018/03 PY - 2018 SN - 978-3-95450-192-2 DO - 10.18429/JACoW-IBIC2017-TUPCF09 UR - http://jacow.org/ibic2017/papers/tupcf09.pdf ER -