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TY - CONF AU - Tanaka, M. AU - Higo, T. AU - Kakihara, K. AU - Kamitani, T. AU - Kimura, K. AU - Suzuki, K. AU - Toyotomi, N. AU - Ushimoto, S. ED - Petit-Jean-Genaz, Christine ED - Arduini, Gianluigi ED - Michel, Peter ED - Schaa, Volker RW TI - Refinement of ARC Alignment between Two Straight Sections for Injector Linac of SuperKEKB J2 - Proc. of IPAC2014, Dresden, Germany, June 15-20, 2014 C1 - Dresden, Germany T2 - International Particle Accelerator Conference T3 - 5 LA - english AB - The beam line of the KEKB injector linac is under realignment as the restoration after the big Earthquake in 2011, but with the refinement for the SuperKEKB in mind. The linac consists of two straight sections connected by a 180 degree ARC. Precise alignment of the ARC magnets is one of the key issues for the emittance preservation of the electron beam. The ARC beam line was defined by measuring these two straight lines. Then, the misalignment of the ARC magnets were reduced from 3 mm maximum down to 0.1mm in the errors perpendicular to the beam direction. This paper describes how we defined the ARC beam line and performed the alignment. The connection method of the laser tracker data needed for the definition of the ARC was also studied and described. PB - JACoW CP - Geneva, Switzerland SP - 1784 EP - 1786 KW - alignment KW - laser KW - linac KW - emittance KW - quadrupole DA - 2014/07 PY - 2014 SN - 978-3-95450-132-8 DO - 10.18429/JACoW-IPAC2014-TUPRI091 UR - http://jacow.org/ipac2014/papers/tupri091.pdf ER -