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TY - CONF AU - Wienands, U. AU - Anderson, S.D. AU - Funakoshi, Y. AU - Gierman, S.M. AU - Kosovsky, M. AU - Masuzawa, M. AU - Oki, T. AU - Spencer, C.M. AU - Sullivan, M.K. ED - Henderson, Stuart ED - Akers, Evelyn ED - Satogata, Todd ED - Schaa, Volker R.W. TI - Dither Coils for the SuperKEKB Fast Collision Feedback System J2 - Proc. of IPAC2015, Richmond, VA, USA, May 3-8, 2015 C1 - Richmond, VA, USA T2 - International Particle Accelerator Conference T3 - 6 LA - english AB - The collision feedback system for the SuperKEKB electron-positron collider at KEK will employ a dither feedback with a roughly 100 Hz excitation frequency to generate a signal proportional to the offset of the two beams. The excitation will be provided by a local bump across the interaction point (IP) that is generated by a set of eight air-core solid-wire magnet coil assemblies, each of which provides a horizontal and/or vertical deflection of the beam, to be installed around the vacuum system of the SuperKEKB Low Energy Ring. The design of the coils was challenging as large antechambers had to be accommodated and a 0.1% relative field uniformity across a good-field region of ±1 cm was aimed for, while keeping reasonable dimensions of the coils. This led to non-symmetric, non-flat designs of the coils. The paper describes the magnetic design and the method used to calculate the magnetic field of the coils, the mechanical design and the field measurement results. Tracking in the lattice model has indicated acceptable performance. PB - JACoW CP - Geneva, Switzerland SP - 3500 EP - 3502 KW - vacuum KW - feedback KW - collider KW - coupling KW - multipole DA - 2015/06 PY - 2015 SN - 978-3-95450-168-7 DO - 10.18429/JACoW-IPAC2015-WEPWI006 UR - http://jacow.org/ipac2015/papers/wepwi006.pdf ER -