JACoW is a publisher in Geneva, Switzerland that publishes the proceedings of accelerator conferences held around the world by an international collaboration of editors.
TY - CONF AU - Ohmi, K. AU - Fukuma, H. AU - Ishibashi, T. AU - Terui, S. AU - Tobiyama, M. AU - Zhou, D. ED - Biagini, Maria Enrica ED - Chrin, Jan ED - Giabbai, Manuela ED - Iungo, Massimiliano ED - Schaa, Volker R.W. TI - Study for -1 Mode Instability in SuperKEKB Low Energy Ring J2 - Proc. of eeFACT2022, Frascati, Italy, 12-16 September 2022 CY - Frascati, Italy T2 - ICFA Advanced Beam Dynamics Workshop on High Luminosity Circular e+e- Colliders T3 - 65 LA - english AB - Emittance increase has been seen in SuperKEKB LER. It is pure single bunch effect: dependent of bunch current but independent of total current. -1 mode signal has been seen in the bunch oscillation recorder at the emittance increase. The emittance increase depends on collimator aperture/impedance and bunch-by-bunch feedback system. We discuss the instability measurement and simulations to explain the phenomenon. PB - JACoW Publishing CP - Geneva, Switzerland SP - 119 EP - 124 KW - feedback KW - impedance KW - emittance KW - dipole KW - kicker DA - 2022/02 PY - 2022 SN - 2673-7027 SN - 978-3-95450-236-3 DO - doi:10.18429/JACoW-eeFACT2022-WEXAT0102 UR - https://jacow.org/eefact2022/papers/wexat0102.pdf ER -