Funakoshi, Y. Bambade, P. Brown, D.G. Di Carlo, S. El Khechen, D. Fisher, A.S. Jehanno, D. Kawamoto, T. Masuzawa, M. Nakamura, S. Oki, T. Pang, C.G. Sullivan, M.K. Tobiyama, M. Uehara, S. Ueki, R. Wienands, U. JACoW Publishing Geneva, Switzerland 978-3-95450-216-5 10.18429/JACoW-eeFACT2018-WEXBA04 English 212-216 WEXBA04 luminosity feedback controls MMI electron Contribution to a conference proceedings 2019 2019-04 https://doi.org/10.18429/JACoW-eeFACT2018-WEXBA04 http://jacow.org/eefact2018/papers/wexba04.pdf SuperKEKB is an electron-positron double ring collider at KEK which aims at a peak luminosity of 8 x 10³⁵ cm⁻²s⁻¹ by using what is known as the ’nano-beam’ scheme. A luminosity dither system is employed for collision orbit feedback in the horizontal plane. This paper reports a system layout of the dither system and algorithm tests during the SuperKEKB Phase 2 commissioning.