Journal Article

PUBDB-2024-04912

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Demonstration of full polarization control of soft X-ray pulses with Apple X undulators at SwissFEL using recoil ion momentum spectroscopy

Kittel, C. (Corresponding author) ; Sarracini, A.Extern* ; Augustin, S.Extern*XFEL.EU* ; Yang, N. ; Haddad, A. A. ; Knopp, G.Extern*XFEL.EU* ; Ferrari, E.DESY* ; Knurr, J. ; Morillo-Candas, A. S. ; Swiderska, I. ; Prat Costa, E.Extern* ; Sammut, N. ; Schmidt, T. ; Bostedt, C.Extern* ; Calvi, M. (Corresponding author)Extern*XFEL.EU* ; Schnorr, K. (Corresponding author)Extern*

2024
Wiley-Blackwell [Erscheinungsort nicht ermittelbar]

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Please use a persistent id in citations: doi:10.1107/S1600577524006325  doi:10.3204/PUBDB-2024-04912

Abstract: The ability to freely control the polarization of X-rays enables measurement tech- niques relying on circular or linear dichroism, which have become indispensable tools for characterizing the properties of chiral molecules or magnetic structures. Therefore, the demand for polarization control in X-ray free-electron lasers is increasing to enable polarization-sensitive, dynamical studies on ultrafast time scales. The soft X-ray branch Athos of SwissFEL was designed with the aim of providing freely adjustable and arbitrary polarization by building its undulator solely from modules of the novel Apple X type. In this paper, we study the mag- netic model of the linear inclined and circular Apple X polarization schemes. We characterize the polarization by measuring the angular electron emission distri- butions of helium for various polarizations using cold target recoil ion momen- tum spectroscopy. We demonstrate the generation of fully linear polarized light of arbitrary angle, as well as elliptical polarizations of varying degree.

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Contributing Institute(s):

1. Beschleunigerphysik (MPY)

Research Program(s):

1. 621 - Accelerator Research and Development (POF4-621) (POF4-621)
2. PSI-FELLOW-III-3i - International, Interdisciplinary & Intersectoral Postdoctoral Fellowships at the Paul Scherrer Institut (884104) (884104)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2024

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