FS-FLASH-B

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2018-08-30
10:18
OpenAccess [PUBDB-2018-03255] Journal Article
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XUV double-pulses with femtosecond to 650 ps separation from a multilayer-mirror-based split-and-delay unit at FLASH
Extreme ultraviolet (XUV) and X-ray free-electron lasers enable new scientific opportunities. Their ultra-intense coherent femtosecond pulses give unprecedented access to the structure of undepositable nanoscale objects and to transient states of highly excited matter [...]
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2018-08-20
14:27
OpenAccess [PUBDB-2018-03069] Journal Article
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CAMP@FLASH: an end-station for imaging, electron- and ion-spectroscopy, and pump–probe experiments at the FLASH free-electron laser
The non-monochromatic beamline BL1 at the FLASH free-electron laser facility at DESY was upgraded with new transport and focusing optics, and a new permanent end-station, CAMP, was installed. This multi-purpose instrument is optimized for electron- and ion-spectroscopy, imaging and pump–probe experiments at free-electron lasers [...]
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2018-01-11
16:57
OpenAccess [PUBDB-2018-00563] Journal Article
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Probing ultra-fast processes with high dynamic range at 4th-generation light sources: Arrival time and intensity binning at unprecedented repetition rates
Structural dynamics 4(2), 024301 - () [10.1063/1.4978042]  GO
Understanding dynamics on ultrafast timescales enables unique and new insights into important processes in the materials and life sciences. In this respect, the fundamental pump-probe approach based on ultra-short photon pulses aims at the creation of stroboscopic movies [...]
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2017-12-22
14:02
OpenAccess [PUBDB-2017-14060] Journal Article
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Experimental study of EUV mirror radiation damage resistance under long-term free-electron laser exposures below the single-shot damage threshold
The durability of grazing- and normal-incidence optical coatings has been experimentally assessed under free-electron laser irradiation at various numbers of pulses up to 16 million shots and various fluence levels below 10% of the single-shot damage threshold. The experiment was performed at FLASH, the Free-electron LASer in Hamburg, using 13.5 nm extreme UV (EUV) radiation with 100 fs pulse duration. [...]
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2017-12-19
11:10
OpenAccess [PUBDB-2017-13688] Journal Article/Contribution to a conference proceedings/Contribution to a book
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A soft x-ray split-and-delay unit for FLASH II
: [Proceedings] - , 2017. - doi:10.1117/12.2265708
Advances in X-ray Free-Electron Lasers Instrumentation IV, PraguePrague, Czech Republic, 24 Apr 2017 - 27 Apr 20172017-04-242017-04-27
Proceedings of SPIE 10237, 1023712 () [10.1117/12.2265708]  GO
For the soft x-ray free-electron laser FLASH II at DESY in Hamburg a new split-and-delay unit (SDU) is built for photon energies in the range of 30 eV < hν < 1500 eV with an option to expand this range to hν = 2500 eV. The SDU is based on wavefront beam splitting at grazing incidence angles. [...]
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2017-12-11
14:25
OpenAccess [PUBDB-2017-13262] Journal Article
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THz pulse doubler at FLASH: double pulses for pump–probe experiments at X-ray FELs
FLASH, the X-ray free-electron laser in Hamburg, Germany, employs anarrowband high-field accelerator THz source for unique THz pump X-rayprobe experiments. However, the large difference in optical paths of the THzand X-ray beamlines prevents utilization of the machine’s full potential (e.g.extreme pulse energies in the soft X-ray range). [...]
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2017-12-07
14:09
OpenAccess [PUBDB-2017-12877] Journal Article/Contribution to a conference proceedings/Contribution to a book
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Grating monochromator with ultrafast response for FLASH2 at DESY
[Proceedings] - , 2017. - ISBN - doi:10.1117/12.2264885
Advances in X-ray Free-Electron Lasers Instrumentation IV, PraguePrague, Czech Republic, 24 Apr 2017 - 27 Apr 20172017-04-242017-04-27
Proceedings of SPIE 10237, 1023716 () [10.1117/12.2264885]  GO
We discuss the design of grating-based monochromators for coherent ultrafast pulses in the extreme-ultraviolet. The main application of such instruments is the monochromatization of ultrafast high-order laser harmonics and freeelectron-laser pulses. [...]
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2017-12-07
14:06
OpenAccess [PUBDB-2017-12875] Journal Article/Contribution to a conference proceedings/Contribution to a book
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Time-delay-compensated grating monochromator for FEL beamlines
: [Proceedings] - , 2014. - doi:10.1117/12.2065257
X-Ray Free-Electron Lasers: Beam Diagnostics, Beamline Instrumentation, and Applications II, San DiegoSan Diego, California, 18 Aug 2014 - 19 Aug 20142014-08-182014-08-19
Proceedings of SPIE 9210, 921001 () [10.1117/12.2065257]  GO
We present the design of a time-delay-compensated monochromator explicitly designed for extreme-ultraviolet FEL sources, in particular the upcoming FLASH II at DESY (Hamburg). The design originates from the variable-line-spaced (VLS) grating monochromator by adding a second grating to compensate for the pulse-front tilt given by the first grating after the diffraction. [...]
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2017-11-29
10:02
OpenAccess [PUBDB-2017-12491] Journal Article
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Diffraction Gratings Metrology and Ray-Tracing Results for an XUV Raman Spectrometer at FLASH
Journal of synchrotron radiation 25(1), 138 - 144 () [10.1107/S1600577517013066] special issue: "Photondiag2017 workshop"  GO
The extreme-ultraviolet double-stage imaging Raman spectrometer is a permanent experimental endstation at the plane-grating monochromator beamline branch PG1 at FLASH at DESY in Hamburg, Germany. This unique instrument covers the photon energy range from 20 to 200 eV with high energy resolution of about 2 to 20 meV (design values) featuring an efficient elastic line suppression as well as effective stray light rejection [...]
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2017-11-20
15:44
[PUBDB-2017-12132] Journal Article
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Quantum imaging with incoherently scattered light from a free-electron laser
Nature physics 14, 126-129 () [10.1038/nphys4301]  GO
The advent of accelerator-driven free-electron lasers (FEL) has opened new avenues for high-resolution structure determination via diffraction methods that go far beyond conventional X-ray crystallography methods. These techniques rely on coherent scattering processes that require the maintenance of first-order coherence of the radiation field throughout the imaging procedure. [...]
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