U. Jastrow
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View article: Hard X-ray operation of X-ray gas monitors at the European XFEL
Hard X-ray operation of X-ray gas monitors at the European XFEL Open
X-ray gas monitors (XGMs) are operated at the European XFEL for non-invasive single-shot pulse energy measurements and average beam-position monitoring. The underlying measurement principle is the photo-ionization of rare gas atoms at low …
View article: Harmonic radiation contribution and X-ray transmission at the Small Quantum Systems instrument of European XFEL
Harmonic radiation contribution and X-ray transmission at the Small Quantum Systems instrument of European XFEL Open
Transmission measurements of the soft X-ray beamline to the Small Quantum Systems (SQS) scientific instrument at the SASE3 undulator of European XFEL are presented. Measurements are reported for a wide range of photon energies (650 eV to 2…
View article: The beam transport system for the Small Quantum Systems instrument at the European XFEL: optical layout and first commissioning results
The beam transport system for the Small Quantum Systems instrument at the European XFEL: optical layout and first commissioning results Open
The Small Quantum Systems instrument is one of the six operating instruments of the European XFEL, dedicated to the atomic, molecular and cluster physics communities. The instrument started its user operation at the end of 2018 after a com…
View article: Two-Color Operation of a Soft X-ray FEL with Alternation of Undulator Tunes
Two-Color Operation of a Soft X-ray FEL with Alternation of Undulator Tunes Open
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-tunable, which allows for testing and using advanced lasing conc…
View article: Subthreshold Erosion of an Organic Polymer Induced by Multiple Shots of an X-Ray Free-Electron Laser
Subthreshold Erosion of an Organic Polymer Induced by Multiple Shots of an X-Ray Free-Electron Laser Open
We report solids irradiated by energetic photons can be eroded in two modes, depending on the radiation intensity. High average, low-peak power sources, e.g., synchrotron radiation and high-order harmonics, induce desorption of the materia…
View article: Transmission measurement at the Bernina branch of the Aramis Beamline of SwissFEL
Transmission measurement at the Bernina branch of the Aramis Beamline of SwissFEL Open
The transmission of the optical components of the Bernina branch of the Aramis beamline at SwissFEL has been measured with an X-ray gas monitor from DESY and compared with a PSI gas detector upstream of the optical components. The transmis…
View article: X-ray photon diagnostics at the European XFEL
X-ray photon diagnostics at the European XFEL Open
The European X-ray Free-Electron Laser (European XFEL) (Altarelli et al. , 2006; Tschentscher et al. , 2017), the world's largest and brightest X-ray free-electron laser (Saldin et al. , 1999; Pellegrini et al. , 2016), went into operation…
View article: An X-ray gas monitor for free-electron lasers
An X-ray gas monitor for free-electron lasers Open
A novel X-ray gas monitor (XGM) has been developed which allows the measurement of absolute photon pulse energy and photon beam position at all existing and upcoming free-electron lasers (FELs) over a broad spectral range covering vacuum u…
View article: Operation of X-ray gas monitors at the European XFEL
Operation of X-ray gas monitors at the European XFEL Open
X-ray gas monitors (XGMs) are operated at the European XFEL for non-invasive single-shot pulse energy measurements and average beam position monitoring. They are used for tuning and maintaining the self-amplified spontaneous emission (SASE…
View article: Measurement of the absolute number of photons of the hard X-ray beamline at the Linac Coherent Light Source
Measurement of the absolute number of photons of the hard X-ray beamline at the Linac Coherent Light Source Open
X-ray free-electron lasers provide intense pulses of coherent X-rays with a short pulse duration. These sources are chaotic by nature and therefore, to be used at their full potential, require that every X-ray pulse is characterized in ter…
View article: First Characterization of the Photon Beam at the European XFEL in July, 2017
First Characterization of the Photon Beam at the European XFEL in July, 2017 Open
North branch of the European XFEL, SASE1, produced first light on May 3rd, 2017, and XFEL operation has been gradually improved then. First characterization of the photon beam has been performed in July / August 2017, just before an offici…
View article: Two-Color Operation of FLASH2 Undulator
Two-Color Operation of FLASH2 Undulator Open
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-tunable which allows to test and use advanced lasing concepts. I…
View article: Simultaneous operation of two soft x-ray free-electron lasers driven by one linear accelerator
Simultaneous operation of two soft x-ray free-electron lasers driven by one linear accelerator Open
Extreme-ultraviolet to x-ray free-electron lasers (FELs) in operation for scientific applications are up to now single-user facilities. While most FELs generate around 100 photon pulses per second, FLASH at DESY can deliver almost two orde…
View article: Pulse energy measurement at the SXR instrument
Pulse energy measurement at the SXR instrument Open
A gas monitor detector was implemented and characterized at the Soft X-ray Research (SXR) instrument to measure the average, absolute and pulse-resolved photon flux of the LCLS beam in the energy range between 280 and 2000 eV. The detector…