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TY - CONF AU - Musardo, M. AU - Cappadoro, P.L. AU - Chubar, O.V. AU - Corwin, T.M. AU - Harder, D.A. AU - Hidaka, Y. AU - Kitegi, C.A. AU - Rank, J. AU - Tanabe, T. ED - Schaa, Volker RW ED - Tavakoli, Keihan ED - Tilmont, Manuel TI - A Quasi-Periodic Elliptically Polarized Undulator at the National Synchrotron Light Source II J2 - Proc. of MEDSI2018, Paris, France, 25-29 June 2018 C1 - Paris, France T2 - Mechanical Engineering Design of Synchrotron Radiation Equipment and Instrumentation T3 - 10 LA - english AB - A 2.8 m long quasi-periodic APPLE II type undulator has been commissioned at the National Synchrotron Light Source II (NSLS-II) for the Electron Spectro-Microscopy (ESM) beamline in the framework of the NEXT (NSLS-II Experimental Tools) project. It provides high brilliance photon beams in circularly and linearly polarized radiation from VUV to soft X-Rays. The mechanical structure implemented to achieve the quasi-periodicity in the magnetic field profile is described together with the optimization techniques utilized to correct the undesirable phase-dependent errors. The final magnetic results are presented as well as the spectral performance of the device. Although this EPU (Elliptically Polarizing Undulator) was procured as a turn-key device, the vendor was only responsible for the mechanical frame and the control system. Sorting and assembly of the magnet modules and the magnetic field tuning - Virtual Shimming and Magic Finger - were performed at the NSLS-II Magnetic Measurement Lab. PB - JACoW Publishing CP - Geneva, Switzerland SP - 88 EP - 91 KW - undulator KW - MMI KW - radiation KW - multipole KW - synchrotron DA - 2018/12 PY - 2018 SN - 978-3-95450-207-3 DO - 10.18429/JACoW-MEDSI2018-TUPH26 UR - http://jacow.org/medsi2018/papers/tuph26.pdf ER -