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TY - CONF AU - Suwada, T. ED - Kim, Changbum ED - Schaa, Volker R. W. ED - Kim, Dong-Eon ED - Lee, Jaeyu TI - Modal Analysis of Electromagnetic Coupling Between SMA-Feedthrough Electrode and Beam for Wideband Beam Monitor J2 - Proc. of IBIC2021, Pohang, Rep. of Korea, 24-28 May 2021 CY - Pohang, Rep. of Korea T2 - International Beam Instrumentation Conference T3 - 10 LA - english AB - The direct simultaneous detection of electron (e-) and positron (e+) bunch signals was successfully performed for the first time by a wideband beam monitor at the positron capture section of the SuperKEKB factory. This monitor can measure a time interval between the e⁻ and e⁺ bunches, their bunch lengths, bunch intensities, and transverse beam positions, depending on the phase of accelerating structures. For this purpose, a new beam monitor with wideband pickups simply using SMA feedthroughs and a wideband detection system based on a fast and real-time oscilloscope was developed to investigate their capture process at the capture section and to maximally optimize the e⁺ intensity. The required specification for the new monitor is to simultaneously detect the e⁺ and e⁻ bunches generated in the capture section within the resolution of pico-second level with a sufficient dynamic range in the time-interval and bunch-length measurements. Thus, the wideband detection system is required for this purpose. In this report, the basic design and results based on a modal analysis of electromagnetic couplings between the SMA-feedthrough electrode and a beam are in detail given along with some obtained performance. PB - JACoW Publishing CP - Geneva, Switzerland SP - 392 EP - 395 KW - coupling KW - impedance KW - linac KW - positron KW - electron DA - 2021/10 PY - 2021 SN - 2673-5350 SN - 978-3-95450-230-1 DO - doi:10.18429/JACoW-IBIC2021-WEPP12 UR - https://jacow.org/ibic2021/papers/wepp12.pdf ER -