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TY - CONF AU - Fukuma, H. AU - Ohmi, K. AU - Suetsugu, Y. AU - Tobiyama, M. ED - Zhao, Ning ED - Poole, John ED - Schaa, Volker RW TI - Electron Cloud at SuperKEKB J2 - Proc. of eeFACT2016, Daresbury, UK, October 24-27, 2016 C1 - Daresbury, UK T2 - ICFA Advanced Beam Dynamics Workshop on High Luminosity Circular e^+e^- Colliders T3 - 58 LA - english AB - Several countermeasures such as ante-chambers, TiN coating, clearing electrodes, grooved structure and so on, have been taken to mitigate the electron cloud effects in the SuperKEKB positron ring. During phase 1 operation of SuperKEKB, which continued from this February to June, the electron cloud effects such as beam size blow-up, non-linear pressure increase, betatron tune shift along a bunch train and transverse coupled bunch instability were observed. Permanent magnets attached at bellows that generate longitudinal magnetic field in vacuum chambers were effective to reduce the electron cloud. This talk will cover following subjects about the electron cloud at SuperKEKB, 1) mitigation methods against the electron cloud, 2) observation of the electron cloud effects in phase 1 operation and 3) plan of further reduction of the electron cloud toward phase 2 operation which will start in the late FY2017. PB - JACoW CP - Geneva, Switzerland SP - 125 EP - 129 KW - ion KW - electron KW - permanent-magnet KW - solenoid KW - operation DA - 2017/07 PY - 2017 SN - 978-3-95450-187-8 DO - 10.18429/JACoW-eeFACT2016-TUT3AH6 UR - http://jacow.org/eefact2016/papers/tut3ah6.pdf ER -