Science@FELS

Session

Poster Session (I)

21 Sept 2026, 16:00

SwissFEL

Conveners

Poster Session (I)

• ALL Posters Science@FELs

53. Commissioning of TRESOR - A High Resolution Electron Spectrometer at the SQS Instrument of euXFEL

John Bozek (Synchrotron SOLEIL)

21/09/2026, 16:00

Science with specific FEL operation

Poster

A Scienta EW4000-6kV hemispherical analyzer has been commissioned at the SQS instrument of the European XFEL. Conceived as a high-resolution electron spectrometer for gas phase studies, TRESOR was installed and first used at euXFEL in spring 2026. With a delay line anode on the detector, the spectrometer can take advantage of the high repetition rate available at euXFEL to overcome problems...

78. Tracing the X-ray induced dynamics in water and ethanol molecules

Eloisa Manetti (PSI - Paul Scherrer Institut)

21/09/2026, 16:01

Chemistry

Poster

Abstract: Understanding X-ray induced dynamics is relevant for a broad field of applications, ranging from X-ray imaging of materials, to medical application of X-rays. Due to the large amount of energy imparted by an absorbed X-ray photon, the triggered relaxation processes typically take place on ultrafast time scales. Water molecules in the gas phase have been studied at the Maloja...

33. Submicron-Precision Machining of Silicon Surface with Intense Femtosecond Extreme Ultraviolet Pulses

Dr Vladimir Lipp (European XFEL)

21/09/2026, 16:02

Solid State Physics

Oral

Femtosecond laser direct writing (LDW) using ultraviolet, visible or infrared lasers is a maskless subtractive manufacturing approach that is widely used for precision surface processing due to the strong spatial confinement of laser energy it provides and the minimal collateral damage it causes. Here, we present a conceptual scheme for high-precision machining of semiconductor materials using...

81. Status and future prospects of FHI FEL: A two-color dual-oscillator infrared free-electron laser

Wieland Schöllkopf (Fritz-Haber-Institut der Max-Planck-Gesellschaft)

21/09/2026, 16:03

Science with specific FEL operation

Oral

We report on the design, performance and applications of FHI FEL, a dual-oscillator two-color infrared free-electron laser which we operate at the Fritz Haber Institute (FHI) in Berlin, Germany [1]. It includes a 50 MeV normal-conducting linac supplying two oscillator FEL branches; a mid-infrared (MIR) FEL (commissioned in 2013) and a new far-infrared (FIR) FEL. What makes the FHI FEL unique...

12. NIR-laser induced dressing signatures in helium nanodroplets probed by coherent diffractive imaging

Tom von Scheven (University of Rostock)

21/09/2026, 16:04

Poster

Single-shot coherent diffractive imaging (CDI) enables the capture of a full diffraction image of a nanostructure using a single flash of XUV or X-ray light. The resulting scattering image encodes both the geometry and the optical properties of the target. So far, this method has mainly been employed for ultrafast structural characterization [1]. However, CDI can also be utilized to resolve...

14. Modeling Laser-induced Dynamics and Material Modification in Thin Gold Foils

Maura Münier

21/09/2026, 16:05

Solid State Physics

Poster

Understanding the dynamics underlying the interaction of ultrashort intense laser pulses with metals is of key interest for advancing controlled laser-based material processing. The irradiation of metal targets with intense laser pulses triggers a variety of physical processes, including the initial laser heating of the electrons, energy transfer between the electronic and lattice system and...

15. Ultrafast Carrier Dynamics in CuO/TiO2 p–n Heterostructures Probed by Time-Resolved Soft X-ray Absorption Spectroscopy

Sang Han Park (Pohang Accelerator Laboratory, Pohang University of Science and Technology (POSTECH))

21/09/2026, 16:06

Solid State Physics

Poster

Understanding charge carrier dynamics at p–n heterojunctions is essential for designing high-efficiency photo-catalysts. Here, we investigate ultrafast charge transfer pathways in a layered CuO/TiO2 heterostructure using time-resolved soft X-ray absorption spectroscopy (tr-XAS) with PAL-XFEL for probing transient electronic structure with elemental and orbital sensitivity.
By tracking...

27. Electron-positron pair beams enable beyond-terawatt attosecond free-electron lasers from soft X-rays to coherent gamma-ray emission

Cagri Erciyes (Max Planck Institute for Nuclear Physics)

21/09/2026, 16:07

Science with specific FEL operation

Poster

Free-electron lasers (FELs) produce intense, coherent light pulses spanning the infrared to hard X-rays, enabling ultrafast studies of matter on atomic scales. Extending FEL operation toward gamma-ray photon energies requires extremely high peak currents, yet in conventional electron beams such compression generates a steady space-charge field that distorts the beam energy and quenches...

99. Light-driven Response of Collective Magnetic Excitations in an Electron-doped Cuprate via tr-RIXS

21/09/2026, 16:08

Invited

Unravelling the response of microscopic degrees of freedom in photoexcited cuprates is a central challenge in ultrafast materials science. While the charge response has been extensively investigated via time-resolved (tr-) optical spectroscopy and tr-ARPES, the nonequilibrium dynamics of magnetic degrees of freedom remain largely unexplored due to the lack of a direct probe. The advent of...

35. Structure Recovery from Fluctuation X-Ray Scattering: A Rotational-Invariant Perspective

Mr Ruslan Kurta (European XFEL)

21/09/2026, 16:09

Poster

Fluctuation X-ray scattering (FXS) offers a complementary approach to imaging of nano- and bioparticles at X-ray free-electron lasers (XFELs) by extracting structural information from statistical moments of large ensembles of measured scattering patterns.
This poster reviews basic concepts behind FXS from the perspective of rotational invariants. Further more, we employed our software suite...

86. Hard X-ray Free Electron Laser pulse mutiplexing and steering capabilities at the European XFEL

Mikako Makita (European XFEL GmbH)

21/09/2026, 16:10

Poster

We present our pulse-multiplexing studies – one of the mid-term strategies at the European X-ray Free Electron Laser (European XFEL). The activity is motivated by hallmark XFEL properties—ultra-high intensity and a high degree of spatial coherence [1-2]—as well as a “MHz repetition rate” that can deliver approximately 400 pulses per each undulator-branch, at 220 ns intervals within a 10 Hz...

24. Circularly-polarized IR FEL pulses selectively probe dynamic processes and pump Rydberg states in doped semiconductors

Guy Matmon (PSI - Paul Scherrer Institut)

21/09/2026, 16:11

Quantum Science

Oral

Abstract:
Short, coherent pulses from infrared free electron lasers has been used extensively for studying population dynamics, and to a lesser extent coherence, of bound carrier states in semiconductors. Here we focus specifically on the hydrogen atom-like states of single donors and acceptors. Several challenges beset characterisation: the ladder of excited bound states is closely spaced in...

17. Core-Level Chiral Response of gas-phase methyl oxirane Investigated by PECD and Ion Spectra

Juliette Leroux (University of Hamburg)

21/09/2026, 16:12

AMO Physics

Poster

Chirality is a fundamental structural feature of many molecules and plays an important role in biological processes as well as in chemical synthesis via lock-and-key-type interactions. Although macroscopic methods exist to determine the enantiomeric excess of chiral molecules in chemical and biological environments, a full microscopic understanding of chirality-specific responses of individual...