Longitudinal electron-beam diagnostics play a critical role in the operation and control of x-
ray free-electron lasers, which rely on parameters such as the current profile, the …

For time-resolved extreme ultraviolet (XUV) pump–XUV probe experiments at the Free
electron LASer in Hamburg (FLASH), a split-and-delay unit (SDU) has been built. It is …

Accelerator applications like free-electron lasers, time-resolved electron diffraction, and
advanced accelerator concepts like plasma acceleration desire bunches of ever shorter …

Superconducting rf (SRF) technology is evolving rapidly, as are its applications. While there
is active exploitation of what one may call the current state-of-the-practice, there is also rapid …

We report the experience of the production, processing and qualification testing of the
superconducting radio frequency cavities at 3.9 GHz for the third harmonic system at the …

Abstract The European X-ray Free-Electron Laser (XFEL) at the Deutsches Elektronen
Synchtrotron (DESY) in Hamburg will, starting in 2015, open up completely new research …

The electron source still remains a major challenge for continuous-wave (CW) X-ray free-
electron lasers (FELs). In this paper, we study the feasibility of an injection line based on a …

The free-electron laser facility FLASH at DESY, Germany has been upgraded in 2009/10.
The electron beam energy has been increased from 1 to 1.25 GeV by adding a 7th …

The limits of performance of the European XFEL 3.9 GHz superconducting cavities were
investigated. Most cavities exhibited high field Q slope, reaching the breakdown field at …

Abstract Laser Wakefield Acceleration (LWFA) has the potential to become the next-
generation acceleration technique for electrons. In particular, the large field gradients …