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@inproceedings{suwada:ibic2021-wepp12, author = {T. Suwada}, title = {{Modal Analysis of Electromagnetic Coupling Between SMA-Feedthrough Electrode and Beam for Wideband Beam Monitor}}, booktitle = {Proc. IBIC'21}, pages = {392--395}, eid = {WEPP12}, language = {english}, keywords = {coupling, impedance, linac, positron, electron}, venue = {Pohang, Rep. of Korea}, series = {International Beam Instrumentation Conference}, number = {10}, publisher = {JACoW Publishing, Geneva, Switzerland}, month = {10}, year = {2021}, issn = {2673-5350}, isbn = {978-3-95450-230-1}, doi = {10.18429/JACoW-IBIC2021-WEPP12}, url = {https://jacow.org/ibic2021/papers/wepp12.pdf}, note = {https://doi.org/10.18429/JACoW-IBIC2021-WEPP12}, abstract = {{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.}}, }