Ohmi, K. Fukuma, H. Tobiyama, M. Electron Cloud and Ion Effects and Their Mitigation in FCC-ee JACoW Geneva, Switzerland 978-3-95450-187-8 10.18429/JACoW-eeFACT2016-TUT3AH5 English 120-124 TUT3AH5 ion electron feedback simulation damping Contribution to a conference proceedings 2017 2017-07 https://doi.org/10.18429/JACoW-eeFACT2016-TUT3AH5 http://jacow.org/eefact2016/papers/tut3ah5.pdf Electron cloud and fast-ion instabilities are serious issues for colliders operated with high current and many bunches. We discuss the instabilities in FCC-ee/hh based on simulations and experiences of KEKB/SuperKEKB.