Alberto Lutman

femto-PIXAR: a self-supervised neural network method for reconstructing femtosecond X-ray free electron laser pulses

Gesa Goetzke, Rajan Plumley, Gregor Hartmann, Tim Maxwell et autres

X-ray free electron lasers (X-FELs) produce ultrafast pulses in a wide range of lasing configurations, supporting a wide variety of scientific applications, including structural biology, materials science, and atomic and molecular physics. Shot-by-shot characterization of the X-FEL pulses is crucial for the …

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Attosecond inner-shell lasing at ångström wavelengths

Thomas Linker, Aliaksei Halavanau, Thomas Kröll, Andrei Benediktovitch et autres

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Hard x-ray attosecond pulses at the LCLS

River Robles, David Cesar, Taran Driver, Paris Franz et autres

The recent development of attosecond x-ray free-electron lasers has opened a new chapter for attosecond science. Attosecond XFELs have a peak brightness that surpasses table-top harmonics sources by more than seven orders of magnitude and enable new applications in non-linear x-ray spectroscopy …

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Characterization of the LCLS-II X-rays with Imagers, Power Meters and Fluorescence Intensity Monitors

Philip Heimann, Oliver Alexander, James Cryan, Georgi L. Dakovski et autres

Abstract The LCLS-II superconducting accelerator has begun operations and has been producing x-rays since August 2023. The current parameters are a photon energy range from 250 eV to 3.8 keV and a maximum repetition rate of 8.29 kHz. Imagers have determined the …

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Hard X-Ray Self-Seeding at LCLS and LCLS-II

Juhao Wu, Alberto Lutman, Zhongquan Qu, Chuan Yang et autres

The latest achievements on Hard X-ray Self-Seeding (HXRSS) at LCLS and LCLS-II with normal conducting LINAC are highlighted with key operation parameters presented. Details of recent R&D progress t...

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Opportunities for gas-phase science at short-wavelength free-electron lasers with undulator-based polarization control

Markus Ilchen, E. Allaria, Primož Rebernik Ribič, H.-D. Nuhn et autres

Free-electron lasers (FELs) are the world's most brilliant light sources with rapidly evolving technological capabilities in terms of ultrabright and ultrashort pulses over a large range of photon energies. Their revolutionary and innovative developments have opened new fields of science regarding nonlinear …

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Non-linear enhancement of ultrafast X-ray diffraction through transient resonances

Stephan Kuschel, Phay J. Ho, André Al Haddad, Felix Zimmermann et autres

Diffraction-before-destruction imaging with ultrashort X-ray pulses can visualize non-equilibrium processes, such as chemical reactions, with sub-femtosecond precision in the native environment. Here, a nanospecimen diffracts a single X-ray flash before it disintegrates. The sample structure can be reconstructed from the coherent diffraction …

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On ultrafast x-ray scattering methods for magnetism

Rajan Plumley, Sathya R. Chitturi, Peng Cheng, Tadesse A. Assefa et autres

With the introduction of x-ray free electron laser sources around the world, new scientific approaches for visualizing matter at fundamental length and time-scales have become possible. As it relates to magnetism and ‘magnetic-type’ systems, advanced scattering methods are being developed for studying …

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Attosecond Inner-Shell Lasing at Angstrom Wavelengths

Thomas Linker, Aliaksei Halavanau, Thomas Kröll, Andrei Benediktovitch et autres

Since the invention of the laser nonlinear effects such as filamentation, Rabi-cycling and collective emission have been explored in the optical regime leading to a wide range of scientific and industrial applications. X-ray free electron lasers (XFELs) have led to the extension …

Microbunch rotation in an x-ray free-electron laser using a first-order achromatic bend

Rachel Margraf, James MacArthur, Gabriel Marcus, H.-D. Nuhn et autres

Electrons in an x-ray free electron laser (XFEL) develop periodic density fluctuations, known as microbunches, which enable the exponential gain of x-ray power in an XFEL. When an electron beam microbunched at a hard x-ray wavelength is kicked, microbunches are often washed …

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Non-linear enhancement of ultrafast X-ray diffraction through transient resonances

Tais Gorkhover, Stephan Kuschel, Phay J. Ho, André Al Haddad et autres

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Opportunities for Gas-Phase Science at Short-Wavelength Free-Electron Lasers with Undulator-Based Polarization Control

Markus Ilchen, E. Allaria, Primož Rebernik Ribič, H.-D. Nuhn et autres

Free-electron lasers (FELs) are the world's most brilliant light sources with rapidly evolving technological capabilities in terms of ultrabright and ultrashort pulses over a large range of accessible photon energies. Their revolutionary and innovative developments have opened new fields of science regarding …

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