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TY - CONF AU - Kim, D.E. AU - Cho, M.-H. AU - Jung, Y.-G. AU - Kang, H.-S. AU - Karabekyan, S. AU - Ko, I.S. AU - Lee, H.-G. AU - Lee, S.B. AU - Lee, W.W. AU - Oh, B.G. AU - Park, K.-H. AU - Pflüger, J. AU - Suh, H.S. ED - Henderson, Stuart ED - Akers, Evelyn ED - Satogata, Todd ED - Schaa, Volker R.W. TI - Updates of the PAL-XFEL Undulator Program 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 - Pohang Accelerator Laboratory (PAL) is developing a 0.1 nm SASE based FEL based on 10 GeV S-band linear accelerator named PAL-XFEL. At the first stage, PAL-XFEL needs two undulator lines for photon source. The hard X-ray undulator line requires 18 units of 5 m long hybrid-type conventional planar undulator and soft X-ray line requires 6 units of 5 m long hybrid type planar undulator with additional few EPUs for final polarization control. PAL is developing undulator magnetic structure based on EU-XFEL concepts. The key parameters are min pole gap of 8.3 mm, with period length 26 mm (HXU), 35 mm (SXU), and 5.0 m magnetic length. . In this report, the prototyping, and the development of pole tuning procedure, the impact of the background field error, and the effects of the girder bending on the optical phase error will be presented. PB - JACoW CP - Geneva, Switzerland SP - 1675 EP - 1677 KW - undulator KW - background KW - FEL KW - electron KW - controls DA - 2015/06 PY - 2015 SN - 978-3-95450-168-7 DO - 10.18429/JACoW-IPAC2015-TUPJE032 UR - http://jacow.org/ipac2015/papers/tupje032.pdf ER -