This report presents the conceptual design of a new European research infrastructure
EuPRAXIA. The concept has been established over the last four years in a unique …

The metal centres in metalloenzymes and molecular catalysts are responsible for the
rearrangement of atoms and electrons during complex chemical reactions, and they enable …

We present the first lasing results of SwissFEL, a hard X-ray free-electron laser (FEL) that
recently came into operation at the Paul Scherrer Institute in Switzerland. SwissFEL is a very …

Free-electron lasers generate high-brilliance coherent radiation at wavelengths spanning
from the infrared to the X-ray domains. The recent development of short-wavelength seeded …

Light-driven sodium pumps actively transport small cations across cellular membranes.
These pumps are used by microorganisms to convert light into membrane potential and …

Free-electron lasers produce extremely brief, coherent, and bright laser-like photon pulses
that allow to image matter at atomic resolution and at timescales faster than the …

Meta-learning can successfully acquire useful inductive biases from data. Yet, its
generalization properties to unseen learning tasks are poorly understood. Particularly if the …

The time–energy information of ultrashort X-ray free-electron laser pulses generated by the
Linac Coherent Light Source is measured with attosecond resolution via angular streaking …

Over more than a century, X-rays have transformed our understanding of the fundamental
structure of matter and have been an indispensable tool for chemistry, physics, biology …

Five years have now passed since the publication of the third edition of Principles of Free-
Electron Lasers and, while the field has matured considerably, we felt that there have been …