FS-FLASH-O

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2017-08-30
14:16
OpenAccess [PUBDB-2017-10149] Contribution to a conference proceedings/Contribution to a book
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Frequency Doubler and Two-color Mode of Operation at Free Electron Laser FLASH2
8th International Particle Accelerator Conference, IPAC17, Meeting locationCopenhagen, Denmark, 15 May 2017 - 19 May 20172017-05-152017-05-19

Geneva : JACoW, 2635-2638 (2017) [10.18429/JACoW-IPAC2017-WEPAB027]  GO
We report on the results of the first operation of a frequency doubler at free electron laser FLASH2. The scheme uses the feature of the variable gap undulator. [...]
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2017-08-30
13:56
OpenAccess [PUBDB-2017-10147] Contribution to a conference proceedings/Contribution to a book
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First Operation of a Harmonic Lasing Self-Seeded FEL
8th International Particle Accelerator Conference, IPAC17, Meeting locationCopenhagen, Denmark, 15 May 2017 - 19 May 20172017-05-152017-05-19

Geneva : JACoW, 2621-2624 (2017) [10.18429/JACoW-IPAC2017-WEPAB023]  GO
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 application of harmonic lasing is so called Harmonic Lasing Self-Seeded Free Electron Laser (HLSS FEL) that allows to improve spectral brightness of these facilities. [...]
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2017-08-24
15:01
OpenAccess [PUBDB-2017-09766] Poster
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Status of the Soft X-Ray Free Electron Laser FLASH
8th International Particle Accelerator Conference, IPAC17, Meeting locationCopenhagen, Denmark, 15 May 2017 - 19 May 20172017-05-152017-05-19

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2017-07-25
10:57
DBCoverage [PUBDB-2017-08413] Journal Article
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Single-shot determination of focused FEL wave fields using iterative phase retrieval

Optics express 25(15), 17892 - 17903 (2017) [10.1364/OE.25.017892]  GO
ddc:530
Determining fluctuations in focus properties is essential for many experiments at Self-Amplified-Spontaneous-Emission (SASE) based Free-Electron-Lasers (FELs), in particular for imaging single non-crystalline biological particles. We report on a diffractive imaging technique to fully characterize highly focused, single-shot pulses using an iterative phase retrieval algorithm, and benchmark it against an existing Hartmann wavefront sensor. [...]
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2017-07-13
16:21
OpenAccess [PUBDB-2017-07579] Preprint/Report
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Alignment, Orientation, and Coulomb Explosion of Difluoroiodobenzene Studied with the Pixel Imaging Mass Spectrometry (PImMS) Camera
[arXiv:1706.08376] ddc:540
Laser-induced adiabatic alignment and mixed-field orientation of 2,6-difluoroiodobenzene (C$_6$H$_3$F$_2$I) molecules are probed by Coulomb explosion imaging following either near-infrared strong-field ionization or extreme-ultraviolet multi-photon inner-shell ionization using free-electron laser pulses. The resulting photoelectrons and fragment ions are captured by a double-sided velocity map imaging spectrometer and projected onto two position-sensitive detectors. [...]
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2017-06-09
15:23
OpenAccess [PUBDB-2017-04626] Journal Article
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Generating circularly polarized radiation in the extreme ultraviolet spectral range at the free-electron laser FLASH
ddc:530
A new device for polarization control at the free electron laser facility FLASH1 at DESY has been commissioned for user operation. The polarizer is based on phase retardation upon reflection off metallic mirrors. [...]
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2017-06-01
14:22
[PUBDB-2017-04151] Journal Article
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Femtosecond response of polyatomic molecules to ultra-intense hard X-rays

Nature 546(7656), 129 - 132 (2017) [10.1038/nature22373]  GO
ddc:070
X-ray free-electron lasers enable the investigation of the structure and dynamics of diverse systems, including atoms, molecules, nanocrystals and single bioparticles, under extreme conditions1, 2, 3, 4, 5, 6, 7. Many imaging applications that target biological systems and complex materials use hard X-ray pulses with extremely high peak intensities (exceeding 1020 watts per square centimetre)3, 5. [...]
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2017-05-12
11:45
OpenAccess [PUBDB-2017-02744] Journal Article
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Attosecond Interferometry with Self-Amplified Spontaneous Emission of a free-electron laser
ddc:500
Light-phase-sensitive techniques, such as coherent multidimensional spectroscopy, are well-established in a broad spectral range, already spanning from radio-frequencies in nuclear magnetic resonance spectroscopy to visible and ultraviolet wavelengths in nonlinear optics with table-top lasers. In these cases, the ability to tailor the phases of electromagnetic waves with high precision is essential [...]
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2017-05-10
10:10
OpenAccess [PUBDB-2017-02555] Report/Journal Article
; ; ; et al
Alignment, orientation, and Coulomb explosion of difluoroiodobenzene studied with the pixel imaging mass spectrometry (PImMS) camera
[arXiv:1706.08376] ddc:540
Laser-induced adiabatic alignment and mixed-field orientation of 2,6-difluoroiodobenzene (C$_6$H$_3$F$_2$I) molecules are probed by Coulomb explosion imaging following either near-infrared strong-field ionization or extreme-ultraviolet multi-photon inner-shell ionization using free-electron laser pulses. The resulting photoelectrons and fragment ions are captured by a double-sided velocity map imaging spectrometer and projected onto two position-sensitive detectors. [...]
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2017-04-21
09:21
OpenAccess [PUBDB-2017-01762] Journal Article
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Multiple Auger cycle photoionisation of manganese atoms by short soft x-ray pulses
ddc:530
The multiple ionisation of atomic Mn, excited at (photon energy: 52.1eV) and above (photon energy: 61.1eV) the discrete giant 3p–3d resonance, was studied using high irradiation free-electron-laser soft x-ray pulses from the BL2 beamline of FLASH, DESY, Hamburg. In particular, the impact of the giant resonance on the ionisation mechanism was investigated. [...]
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