Status of the undulator development at the SwissFEL

by Marco Calvi (Insertion Device group, Synchrotron Radiation & Nanotechnology Department, PSI)

Friday 6 Jun 2014, 15:00 → 16:00 Europe/Zurich

6/2-024 - BE Auditorium Meyrin (CERN)

Abstract: The SwissFEL is the next large test facility in construction at the Paul Scherrer Institute. This free electron laser (FEL) is driven by a 6 GeV linac and it is organized in two main beamlines, the first (Aramis) covers hard x-ray regime between 0.1 and 0.7 nm photon wavelength, the second one (Athos) the soft x-ray regime between 0.7 and 7.0 nm. One of the technological challenges introduced by FELs is the undulator length: the Aramis line requires a 50 m long undulator where the typical length of a comparable device in a synchrotron light is about 2.5 m. Technically such a long undulator is usually divided into many segments not only for fabrication feasibility but also to install monitors for electron diagnostics and magnets for trajectory correction and betatron matching. After a general introduction to the SwissFEL machine and its main parameters, the development of Aramis undulators (U15) is addressed starting with the novel mechanical layout and the design of the field profile based on permanent magnets. The magnetic measurement results of the first prototype and the tests with beam at the PSI injector test facility are reported and the open issues discussed. Before the conclusions a short outlook on possible applications of superconductivity for FEL undulators is attempted together with same examples of ongoing projects.

Slides CERN_seminar_June6_2014.pptx