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TY - CONF AU - Schmidt, T. AU - Aiba, M. AU - Alarcon, A.D. AU - Arrell, C. AU - Bettoni, S. AU - Calvi, M. AU - Cassar, A. AU - Ferrari, E. AU - Follath, R. AU - Ganter, R. AU - Hiller, N. AU - Juranič, P.N. AU - Kittel, C. AU - Löhl, F. AU - Prat, E. AU - Reiche, S. AU - Sammut, N.J. AU - Schietinger, T. AU - Voulot, D. AU - Wagner, U.H. ED - Schaa, Volker R.W. ED - Decking, Winfried ED - Sinn, Harald ED - Geloni, Gianluca ED - Schreiber, Siegfried ED - Marx, Michaela TI - Experience with Short-Period, Small Gap Undulators at the SwissFEL Aramis Beamline J2 - Proc. of FEL2019, Hamburg, Germany, 26-30 August 2019 CY - Hamburg, Germany T2 - Free Electron Laser Conference T3 - 39 LA - english AB - The SwissFEL Aramis beamline provides hard X-ray FEL radiation down to 1 Angström with 5.8 GeV and short period, 15 mm, in-vacuum undulators (U15). To reach the maximum designed K-value of 1.8 the U15s have to be operated with vacuum gaps down to 3.0 mm. The thirteen-undulator modules are 4 m long and each of them is equipped with a pair of permanent magnet quadrupoles at the two ends, aligned magnetically to the undulator axis. Optical systems and dedicated photon diagnostics are used to check the alignment and improve the K-value calibration. In this talk the main steps of the undulator commissioning will be recalled and a systematic comparison between the magnetic results and the electron and photon based measurements will be reported to highlight achievements and open issues. PB - JACoW Publishing CP - Geneva, Switzerland SP - 564 EP - 568 KW - undulator KW - alignment KW - photon KW - FEL KW - electron DA - 2019/11 PY - 2019 SN - 978-3-95450-210-3 DO - doi:10.18429/JACoW-FEL2019-WED01 UR - http://jacow.org/fel2019/papers/wed01.pdf ER -