FS-FLASH-O

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2017-11-29
17:42
[PUBDB-2017-12552] Contribution to a conference proceedings/Contribution to a book
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Experience with Multi-Beam and Multi-Beamline FEL-Operation
8th International Particle Accelerator Conference, IPAC17, Meeting locationCopenhagen, Denmark, 15 May 2017 - 19 May 20172017-05-152017-05-19 2615-2617 (2017)
DESY’s free-electron laser FLASH provides soft X-raypulses for scientific users at wavelengths down to 4 nm simultaneously in two undulator beamlines. They are driven by a common linear superconducting accelerator with a beamenergy of up to 1.25 GeV. [...]
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2017-11-29
17:27
OpenAccess [PUBDB-2017-12551] Journal Article
; ; ; et al
Experience with Multi-Beam and Multi-Beamline FEL-Operation
ddc:530
DESY’s free-electron laser FLASH provides soft X-ray pulses for scientific usersat wavelengths down to 4 nm simultaneously in two undulator beamlines. They are drivenby a common linear superconducting accelerator with a beam energy of up to 1.25 GeV. [...]
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2017-11-13
18:29
[PUBDB-2017-11924] Poster
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Ultrafast fragmentation dynamics of Phenanthrene andPyrene after photoionization at 30.3 nm wavelength
DESY Users Meeting 2017, Meeting locationHamburg, Germany, 25 Jan 2017 - 27 Jan 20172017-01-252017-01-27

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2017-11-09
10:46
OpenAccess [PUBDB-2017-11808] Journal Article
; ; ; et al
Coulomb-explosion imaging of concurrent CH$_{2}$BrI photodissociation dynamics
ddc:530
The dynamics following laser-induced molecular photodissociation of gas-phase CH$_{2}$BrI at 271.6 nm were investigated by time-resolved Coulomb-explosion imaging using intense near-IR femtosecond laser pulses. The observed delay-dependent photofragment momenta reveal that CH$_{2}$BrI undergoes C-I cleavage, depositing 65.6% of the available energy into internal product states, and that absorption of a second UV photon breaks the C-Br bond ofCH$_{2}$Br. [...]
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2017-11-09
10:29
[PUBDB-2017-11802] Journal Article
; ; ; et al
Single-shot nonlinear spectroscopy in the vacuum-ultraviolet
Optica 4(8), 871 - 878 (2017) [10.1364/OPTICA.4.000871]  GO
ddc:530
Time-resolved spectroscopy in the vacuum/extreme ultraviolet (VUV/XUV) spectral range promises to disclose ultrafast dynamics in all states of matter. Completing a measurement within a single shot eliminates the influence of experimental parameter fluctuations and enhances its statistical significance. [...]
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2017-11-08
18:42
OpenAccess [PUBDB-2017-11787] Journal Article
; ; ; et al
The FLASH Facility: Advanced Options for FLASH2 and Future Perspectives
ddc:600
Since 2016, the two free-electron laser (FEL) lines FLASH1 and FLASH2 have been run simultaneously for users at DESY in Hamburg. With the installation of variable gap undulators in the new FLASH2 FEL line, many new possibilities have opened up in terms of photon parameters for experiments. [...]
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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
; ; ; et al
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
; ; ; et al
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  GO
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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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