The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
TY - CONF AU - Chung, T.Y. AU - Chang, C.-H. AU - Chang, C.H. AU - Huang, J.C. AU - Hwang, C.-S. AU - Jan, J.C. AU - Lin, F.-Y. AU - Wu, C.Y. ED - Petit-Jean-Genaz, Christine ED - Arduini, Gianluigi ED - Michel, Peter ED - Schaa, Volker RW TI - Performance of Elliptical Polarization Undulators at TPS J2 - Proc. of IPAC2014, Dresden, Germany, June 15-20, 2014 C1 - Dresden, Germany T2 - International Particle Accelerator Conference T3 - 5 LA - english AB - Design, assembly, field shimming, and performance of APPLE-II type undulators in NSRRC are described in this article. Essentially, the mechanical error has been well controlled based on the optimize design and mechanical arts. Effectively initial sorting of permanent magnets is developed to minimize several adverse effects, such as magnetic inhomogeneities, no perfection geometry of blocks, and mechanical frame issue, those challenge the sorting expectation, especially for an adjusted polarization undulator. The sorting algorithm shows a quantitative prediction of magnetic field and is verified by measurement results. 2D virtual shimming algorithm has been developed to optimize field quality, including multipole, phase error, and particle trajectory. We describe the considering of each procedure and demonstrate the optimization together with measurement results. PB - JACoW CP - Geneva, Switzerland SP - 987 EP - 989 KW - undulator KW - polarization KW - multipole KW - photon KW - FEL DA - 2014/07 PY - 2014 SN - 978-3-95450-132-8 DO - 10.18429/JACoW-IPAC2014-TUOCB03 UR - http://jacow.org/ipac2014/papers/tuocb03.pdf ER -