Rehman, M.A. Suwada, T. JACoW Publishing Geneva, Switzerland 2673-5350 978-3-95450-230-1 10.18429/JACoW-IBIC2021-MOPP10 English 52-55 wakefield simulation positron experiment vacuum Contribution to a conference proceedings 2021 2021-10 https://doi.org/10.18429/JACoW-IBIC2021-MOPP10 https://jacow.org/ibic2021/papers/mopp10.pdf At the SuperKEKB injector linac, positrons are generated by striking electron beam at tungsten target. The secondary electrons are also produced during positron creation and accelerated in the positron capture section. A new wideband feedthrough-beam position monitor (BPM) system was developed for synchronous detection of secondary produced e⁻ and e⁺ beams with temporal separation of about 180 ps. When e⁺/e⁻ bunches pass through the accelerating structure or vacuum duct of different radius, they generate wakefields. These wakefields can be directly observed with the feedthrough-BPM. A simulation study has also been carried to validate the observed wakefield effects with the feedthrough-BPM. The effects of wakefields on beam parameters will be reported in this paper.