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TY - CONF AU - Valléau, M. AU - Berteaud, P. AU - Briquez, F. AU - Brunelle, P. AU - Béchu, N. AU - Couprie, M.-E. AU - Da Silva Castro, J. AU - Dubuisson, J.M. AU - Ghaith, A. AU - Herbeaux, C. AU - Idam, J. AU - Kitegi, C.A. AU - Lepage, F. AU - Lestrade, A. AU - Louvet, M. AU - Marcouillé, O. AU - Marteau, F. AU - Mary, A. AU - Nadji, A. AU - Nadolski, L.S. AU - Rommeluère, P. AU - Sebdaoui, M. AU - Somogyi, A. AU - Tavakoli, K.T. AU - Tilmont, M. AU - Weitkamp, T. ED - Chin, Yong Ho ED - Zhao, Zhentang ED - Petit-Jean-Genaz, Christine ED - Schaa, Volker RW TI - Construction and Optimization of Cryogenic Undulators at SOLEIL J2 - Proc. of FLS2018, Shanghai, China, 5-9 March 2018 C1 - Shanghai, China T2 - ICFA Advanced Beam Dynamics Workshop T3 - 60 LA - english AB - With permanent magnets undulator operation at cryogenic temperature, the magnetic field and the coercivity can be enhanced, enabling shorter periods with high magnetic fields. The first full scale (2 m long, 18 mm period) hybrid cryogenic undulator  using PrFeB  magnets operating at 77 K was installed at SOLEIL in 2011. Photon spectra measurements, in good agreement with the ex-pectations from magnetic measurements, were used for precise alignment and taper optimization. The second and third 18 mm PrFeB cryogenic undulators, modified to a half-pole/magnet/half-pole structure, were optimized without any magnet or pole shimming after assembly but mechanical sortings and some geometrical corrections had been done before assembly. A systematic error on individual magnets on the third U18 was also compensated. In-situ measurement benches, including a Hall probe and a stretched wire to optimize the undulator field at room and cryogenic temperature are presented. An upgrade of these in-situ benches will be detailed with the fabrication of a 15 mm 3 m long PrFeB cryogenic undulator at SOLEIL. PB - JACoW Publishing CP - Geneva, Switzerland SP - 193 EP - 198 KW - ion KW - undulator KW - cryogenics KW - vacuum KW - electron DA - 2018/06 PY - 2018 SN - 978-3-95450-206-6 DO - 10.18429/JACoW-FLS2018-THP2WD01 UR - http://jacow.org/fls2018/papers/thp2wd01.pdf ER -