# FS-FLASH-O

 2018-12-0120:24 [PUBDB-2018-05141] Journal Article et al Coulomb explosion imaging of $CH_{3}I$ and $C_{2}ClI$ photodissociation dynamics The journal of chemical physics 149(20), 204313 (2018) [10.1063/1.5041381]   The photodissociation dynamics of CH$_3$I and CH$_2$ClI at 272 nm were investigated by time-resolved Coulomb explosion imaging, with an intense non-resonant 815 nm probe pulse. Fragment ion momenta over a wide m/z range were recorded simultaneously by coupling a velocity map imaging spectrometer with a pixel imaging mass spectrometry camera [...] Restricted: PDF PDF (PDFA); 2018-11-2816:30 [PUBDB-2018-04936] Poster et al Status of the Superconducting Soft X-ray Free-Electron Laser FLASH at DESY The 9th International Particle Accelerator Conference, IPAC 2018, Vacnouver, BCVacnouver, BC, Canada, 29 Apr 2018 - 4 May 2018   FLASH, the free-electron laser (FEL) user facility at DESY, deliverers high brilliance XUV and soft x-ray FEL radiation for photon experiments since summer 2005.In 2014 and 2015 a second beamline, FLASH2, has been commissioned in parallel to user operation at FLASH1.FLASH's superconducting linac can produce bunch trains of up to 800 bunches within a 0.8 ms RF flat top at a repetition rate of 10 Hz.In standard operation during 2017 FLASH supplied up to 500 bunches in two bunch trains with independent fill patterns and compression schemes.Since mid 2017 initial commissioning of a third experimental beamline, accommodating the FLASHForward plasma wakefield acceleration experiment, has started.We report on the highlights of the FLASH operation in 2017/2018.. OpenAccess: PDF PDF (PDFA); 2018-11-2816:23 [PUBDB-2018-04935] Contribution to a conference proceedings et al Status of the Superconducting Soft X-ray Free-Electron Laser FLASH at DESY 9th International Particle Accelerator Conference, IPAC'18, Vancouver, BCVancouver, BC, Canada, 29 Apr 2018 - 4 May 2018 4 pp. (2018) [10.3204/PUBDB-2018-04935]   FLASH, the free-electron laser (FEL) user facility at DESY, deliverers high brilliance XUV and soft x-ray FEL radiation for photon experiments since summer 2005.In 2014 and 2015 a second beamline, FLASH2, has been commissioned in parallel to user operation at FLASH1.FLASH's superconducting linac can produce bunch trains of up to 800 bunches within a 0.8 ms RF flat top at a repetition rate of 10 Hz.In standard operation during 2017 FLASH supplied up to 500 bunches in two bunch trains with independent fill patterns and compression schemes.Since mid 2017 initial commissioning of a third experimental beamline, accommodating the FLASHForward plasma wakefield acceleration experiment, has started.We report on the highlights of the FLASH operation in 2017/2018.. OpenAccess: PDF PDF (PDFA); External link: Fulltext 2018-11-1316:52 [PUBDB-2018-04481] Journal Article et al Damage accumulation in thin ruthenium films induced by repetitive exposure to femtosecond XUV pulses below the single-shot ablation threshold Journal of the Optical Society of America / B 35(11), 2799 - 2805 (2018) [10.1364/JOSAB.35.002799]   The process of damage accumulation in thin ruthenium films exposed to multiple femtosecond extreme ultraviolet (XUV) free-electron laser (FEL) pulses below the critical angle of reflectance at the FEL facility in Hamburg (FLASH) was experimentally analyzed. The multi-shot damage threshold is found to be lower than the single-shot damage threshold [...] Restricted: PDF PDF (PDFA); 2018-11-0116:28 [PUBDB-2018-04108] Journal Article et al Double-grating monochromatic beamline with ultrafast response for FLASH2 at DESY Journal of synchrotron radiation 25(1), 131 - 137 (2018) [10.1107/S1600577517013777]   The preliminary design of a monochromatic beamline for FLASH2 at DESY is presented. The monochromator is tunable in the 50–1000 eV energy range with resolving power higher than 1000 and temporal response below 50 fs over the whole energy range [...] OpenAccess: PDF PDF (PDFA); 2018-11-0116:25 [PUBDB-2018-04107] Journal Article et al A sensitive EUV Schwarzschild microscope for plasma studies with sub-micrometer resolution Review of scientific instruments 89(2), 023703 (2018) [10.1063/1.5007950]   We present an extreme ultraviolet (EUV) microscope using a Schwarzschild objective which is optimized for single-shot sub-micrometer imaging of laser-plasma targets. The microscope has been designed and constructed for imaging the scattering from an EUV-heated solid-density hydrogen jet [...] Restricted: PDF PDF (PDFA); 2018-11-0116:12 [PUBDB-2018-04106] Journal Article et al Generation and characterization of ultrathin free-flowing liquid sheets Nature Communications 9(1), 1353 (2018) [10.1038/s41467-018-03696-w]   The physics and chemistry of liquid solutions play a central role in science, and our understanding of life on Earth. Unfortunately, key tools for interrogating aqueous systems, such as infrared and soft X-ray spectroscopy, cannot readily be applied because of strong absorption in water [...] OpenAccess: PDF PDF (PDFA); 2018-10-2513:52 [PUBDB-2018-03930] Journal Article et al An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers JoVE 140, e57055 (2018) [10.3791/57055]   This protocol describes key steps in performing and analyzing femtosecond pump-probe experiments that combine a femtosecond optical laser with a free-electron laser. This includes methods to establish the spatial and temporal overlap between the optical and free-electron laser pulses during the experiment, as well as important aspects of the data analysis, such as corrections for arrival time jitter, which are necessary to obtain high-quality pump-probe data sets with the best possible temporal resolution. [...] OpenAccess: PDF; External link: Fulltext 2018-10-1914:18 [PUBDB-2018-03853] Journal Article et al Time gated ion microscopy of light-atom interactions Journal of optics 20(2), 024018 (2018) [10.1088/2040-8986/aaa326]   The development of ultra-short intense laser sources in the visible and extreme ultraviolet (XUV) spectral range has led to fascinating studies in laser-matter interactions and attosecond science. In the majority of these studies, the system under investigation interacts with a focused light beam, which ionizes the system [...] Restricted: PDF PDF (PDFA); 2018-09-3017:41 [PUBDB-2018-03676] Journal Article et al Phase transition lowering in dynamically compressed silicon Nature physics xxx(xxx), xxx (2018) [10.1038/s41567-018-0290-x]   Silicon, being one of the most abundant elements in nature, attracts wide-ranging scientific and technological interest. Specifically, in its elemental form, crystals of remarkable purity can be produced. 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