376 citations · 425 across the 6 of their papers we have counts for
8 papers
Automatic adjustment of undulator optics for FELs
Zhichu Chen, Bart Faatz
In this paper, we describe a way to automatically adjust the quadrupole focusing along the undulator to avoid the instabilities, taking into account energy change and undulator foc…
Flexible multi-bunch-length operation for continuous-wave x-ray free-electron lasers
Zihan Zhu, Jiawei Yan, Hanxiang Yang +4
The X-ray free-electron lasers (XFELs) are cutting-edge instruments pivotal in a broad range of fields, providing high-power X-ray pulses with durations spanning from femtoseconds…
Two-color operation of a soft x-ray FEL with alternation of undulator tunes
E. A. Schneidmiller, I. J. Bermudez Macias, M. Beye +13
FLASH is the first soft X-ray FEL user facility, routinely providing brilliant photon beams for users since 2005. The second undulator branch of this facility, FLASH2, is gap-tunab…
RF regulation with superconducting cavities and beam operation using a frequency shifted cavity
Sven Pfeiffer, Valeri Ayvazyan, Julien Branlard +11
The free-electron laser FLASH at DESY and the European XFEL are operated with superconducting radio frequency cavities and supply beam to several user experiments. The switching ti…
High-repetition-rate seeded free-electron laser with direct-amplification of an external coherent laser
Xiaofan Wang, Chao Feng, Bart Faatz +2
Various scientific and industrial researches such as spectroscopy and advanced nano-technologies have been demanding high flux and fully coherent EUV and X-ray radiation. These dem…
First operation of a harmonic lasing self-seeded free electron laser
E. A. Schneidmiller, B. Faatz, M. Kuhlmann +4
Harmonic lasing is a perspective mode of operation of X-ray FEL user facilities that allows to provide brilliant beams of higher energy photons for user experiments. Another useful…
Empirical Optimization of Undulator Tapering at FLASH2 and Comparison with Numerical Simulations
Alan Mak, Francesca Curbis, Bart Faatz +1
In a free-electron laser equipped with variable-gap undulator modules, the technique of undulator tapering opens up the possibility to increase the radiation power beyond the initi…
First Observation of Self-Amplified Spontaneous Emission in a Free-Electron Laser at 109 nm Wavelength
J. Andruszkow
We present the first observation of Self-Amplified Spontaneous Emission (SASE) in a free-electron laser (FEL) in the Vacuum Ultraviolet regime at 109 nm wavelength (11 eV). The obs…