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TY - CONF AU - Maesaka, H. AU - Dewa, H. AU - Fujita, T. AU - Masaki, M. AU - Takano, S. ED - Schaa, Volker RW TI - Development of Beam Position Monitor for the SPring-8 Upgrade J2 - Proc. of IBIC2018, Shanghai, China, 9-13 September 2018 C1 - Shanghai, China T2 - International Beam Instrumentation Conference T3 - 7 LA - english AB - We are developing a new electron beam position monitor (BPM) system for the low-emittance upgrade of SPring-8. The requirements for the BPM system are: (1) a single-pass resolution of 100 µm rms for a 100 pC bunch and an electric center accuracy of 100 µm rms for the initial beam commissioning to achieve the first turn, (2) a closed-orbit distortion (COD) resolution better than 0.1 µm rms for a 100 mA stored beam and a position stability of less than 5 µm for the ultimate stability of a photon beam axis. We have completed prototypes of a precise button electrode and a BPM block to obtain high-intensity signals and sufficient mechanical accuracy while suppressing high-Q trapped modes leading to impedance and heating issues. The development of readout electronics based on the MTCA.4 standard and the evaluation of radiation-hard coaxial cables have also been conducted. The prototype BPM head was installed in the present SPring-8 storage ring for performance verification with an actual electron beam. We confirmed sufficient signal intensity, electric center accuracy, position stability, etc. by the beam test. The new BPM system is almost ready for the SPring-8 upgrade. PB - JACoW Publishing CP - Geneva, Switzerland SP - 204 EP - 207 KW - electron KW - radiation KW - electronics KW - vacuum KW - brilliance DA - 2018/11 PY - 2018 SN - 978-3-95450-201-1 DO - 10.18429/JACoW-IBIC2018-TUOC04 UR - http://jacow.org/ibic2018/papers/tuoc04.pdf ER -