%0 Conference Paper
%A Tischer, Markus
%A Bienert, Hilmar
%A Götze, Kathrin
%A Neumann, Paul
%A Ramm, Torsten
%A Schoeps, Andreas
%A Talkovski, Peter
%A Telawane, Sayali
%A Vagin, Pavel
%T Construction and commissioning of an APPLE-III afterburner undulator as a prototype for radiators in the new seeding line of FLASH2020+
%J Journal of physics / Conference Series
%V 3010
%N 1
%@ 1742-6588
%C Bristol
%I IOP Publ.
%M PUBDB-2024-07181
%P 012045
%D 2025
%X An APPLE-III undulator with 17.5 mm period length operating at aminimum magnetic gap of 8 mm was installed downstream of the FLASH2 SASEundulators. This device serves as an afterburner and was designed to providearbitrarily (also circularly) polarized light at the 3rd harmonic of the FLASH2radiation with a wavelength of 1.33 nm to 1.77 nm (890-700eV), covering theabsorption L-edges of the magnetic 3d elements. After characterization of thedifferent polarization modes at different wavelengths in a first commissioningphase, first user experiments have been conducted.Here, we report on our experiences with the mechanical and magnetic assemblyof the APPLE-III UE17 as well as on magnetic measurements and tuning oftrajectories and phase errors at the different polarization states.
%B 15th International Conference on Synchrotron Radiation Instrumentation
%C 26 Aug 2024 - 30 Aug 2024, Hamburg (Germany)
Y2 26 Aug 2024 - 30 Aug 2024
M2 Hamburg, Germany
%F PUB:(DE-HGF)16 ; PUB:(DE-HGF)8
%9 Journal ArticleContribution to a conference proceedings
%R 10.1088/1742-6596/3010/1/012045
%U https://bib-pubdb1.desy.de/record/618828