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TY - CONF AU - Fukami, K. AU - Aoki, T. AU - Azumi, N. AU - Inoue, S.I. AU - Kai, T. AU - Kimura, H. AU - Kiuchi, J. AU - Matsubara, S. AU - Matsui, S. AU - Takano, S. AU - Taniuchi, T. AU - Watanabe, T. AU - Yanagida, K. AU - Zhang, C. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Magnet Developments and Precise Alignment Schemes for SPring-8-II J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - The magnet lattice design of the SPring-8 upgrade, SPring-8-II, is a five bend achromat composed of one normal and four longitudinal gradient bending magnets. Permanent magnet has been chosen for both types of the dipoles, and the high gradient multipole magnets are all electromagnets. This presentation will overview the magnet developments and precise alignment schemes for SPring-8-II, focusing specifically on the following features. Temperature insensitive magnetic circuits with a function of fine magnetic field tuning have been developed for the permanent magnet dipoles. Narrow bore multipole magnets with compact coil assemblies have been designed. We optimized the shimming for enough good field regions, and minimized ohmic loss at the coils for suppressing thermal deformation. To improve the accuracy of vibrating wire magnet alignment, practical wire sag distributions have been quantitatively evaluated. In 2018, a test half-cell was constructed by which the feasibilities of the magnets and the overall alignment precisions including the effects of the thermal deformation of magnets, a repeatability of magnet reassembly has been confirmed. PB - JACoW Publishing CP - Geneva, Switzerland SP - 4158 EP - 4160 KW - alignment KW - multipole KW - lattice KW - sextupole KW - quadrupole DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-THPTS024 UR - http://jacow.org/ipac2019/papers/thpts024.pdf ER -