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TY - CONF AU - Iida, N. AU - Kikuchi, M. AU - Kodama, K. AU - Mimashi, T. AU - Mori, T. AU - Ohnishi, Y. AU - Oide, K. AU - Sugimoto, H. AU - Tawada, M. ED - Schaa, Volker RW ED - Arduini, Gianluigi ED - Pranke, Juliana ED - Seidel, Mike ED - Lindroos, Mats TI - Cancellation of the Leak Field from Lambertson Septum for the Beam Abort System in the SuperKEKB J2 - Proc. of IPAC2017, Copenhagen, Denmark, 14â19 May, 2017 C1 - Copenhagen, Denmark T2 - International Particle Accelerator Conference T3 - 8 LA - english AB - The first commissioning of SuperKEKB, Phase 1, was performed from February 2016 for five months. A Lambertson septum magnet is utilized to vertically extract the aborted beam, kicked by the horizontal abort kickers upstream into a beam dump. This magnet creates unexpected leak field with a non-negligible skew quadrupole component to the stored beam. Two kinds of skew quadrupole magnets are installed on both sides of the Lambertson septum. One is additional skew windings on the sextupole magnet, and the other is a skew quadrupole magnet with permanent magnets. This paper will report that the cancellations of the leak fields was successful and useful for optics correction. PB - JACoW CP - Geneva, Switzerland SP - 2918 EP - 2921 KW - quadrupole KW - coupling KW - sextupole KW - emittance KW - septum DA - 2017/05 PY - 2017 SN - 978-3-95450-182-3 DO - 10.18429/JACoW-IPAC2017-WEPIK006 UR - http://jacow.org/ipac2017/papers/wepik006.pdf ER -