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| Title | Construction and Optimization of Cryogenic Undulators at SOLEIL | |||||
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| Abstract | 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 [1] using PrFeB [2] 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. | |||||
| Footnotes & References | [1] C. Benabderrahmane, M. Valléau, M. E. Couprie, Phys. Rev. Accel. Beams 20, 033201(2017) [2] C. Benabderrahmane, M. Valléau, M. E. Couprie, NIMA 669, 1-6, (2012) |
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| Funding | Synchrotron SOLEIL, L'Orme des Merisiers, 91 192 BP 34 Gif-sur-Yvette, France, | |||||
| Paper | download THP2WD01.PDF [0.696 MB / 6 pages] | |||||
| Export | download ※ BibTeX ※ LaTeX ※ Text/Word ※ RIS ※ EndNote | |||||
| Conference | FLS2018, Shanghai, China | |||||
| Series | ICFA Advanced Beam Dynamics Workshop (60th) | |||||
| Proceedings | Link to full FLS2018 Proccedings | |||||
| Session | WG-D | |||||
| Date | 08-Mar-18 16:00–18:00 | |||||
| Main Classification | D - Key Technologies | |||||
| Keywords | ion, undulator, cryogenics, vacuum, electron | |||||
| Publisher | JACoW Publishing, Geneva, Switzerland | |||||
| Editors | Yong Ho Chin (KEK, Tsukuba, Japan); Zhentang Zhao (SINAP, Shanghai, China); Christine Petit-Jean-Genaz (CERN, Geneva, Switzerland); Volker RW Schaa (GSI, Darmstadt, Germany) | |||||
| ISBN | 978-3-95450-206-6 | |||||
| Published | June 2018 | |||||
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