FS-FL

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2017-04-12
10:21
OpenAccess [PUBDB-2017-01661] Journal Article
; ; ; et al
Jitter-correction for IR/UV-XUV pump-probe experiments at the FLASH free-electron laser
ddc:530
In pump-probe experiments employing a free-electron laser (FEL) in combination with a synchronized optical femtosecond laser, the arrival-time jitter between the FEL pulse and the optical laser pulse often severely limits the temporal resolution that can be achieved. Here, we present a pump-probe experiment on the UV-induced dissociation of 2,6-difluoroiodobenzene $(C_{6}H_{3}F_{2}I)$ molecules performed at the FLASH FEL that takes advantage of recent upgrades of the FLASH timing and synchronization system to obtain high-quality data that are not limited by the FEL arrival-time jitter. [...]
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2017-03-16
10:09
[PUBDB-2017-01389] Journal Article
; ;
Auf der Jagd nach Quantentornados
ddc:530
Die hochintensiven und ultrakurzen Lichtpulse moderner Röntgenlaser erlauben es, chemische Reaktionen auf molekularer Ebene zu filmen und Beugungsbilder von Nanokristallen oder einzelnen Viren aufzunehmen, mit denen sich deren Struktur entschlüsseln lässt. Auf diese Weise ist es einer internationalen Gruppe unter Beteiligung des DESY gelungen, Schnappschüsse von Quantenstrudeln in winzigen Tröpfchen suprafluiden Heliums aufzunehmen..
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2016-12-21
12:01
OpenAccess [PUBDB-2016-06533] Preprint/Report
; ; ; et al
First Operation of a Harmonic Lasing Self-Seeded Free Electron Laser
[DESY-16-243; arXiv:1612.03635]
 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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2016-09-14
09:52
OpenAccess [PUBDB-2016-03626] Report
; ; ; et al
Empirical Optimization of Undulator Tapering at FLASH2 and Comparison with Numerical Simulations
[DESY-16-168; arXiv:1608.08108]
15 pp., (2016)
In a free-electron laser equipped with variable-gap undulator modules, the technique of undulator tapering opens up the possibility to increase the radiation power beyond the initial saturation point, thus enhancing the efficiency of the laser. The effectiveness of the enhancement relies on the proper optimization of the taper profile. [...]
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2016-08-22
16:16
OpenAccess [PUBDB-2016-03305] Journal Article
; ; ; et al
Angle resolved photoelectron spectroscopy of two-color XUV–NIR ionization with polarization control
ddc:530
Electron emission caused by extreme ultraviolet (XUV) radiation in the presence of a strong near infrared (NIR) field leads to multiphoton interactions that depend on several parameters. Here, a comprehensive study of the influence of the angle between the polarization directions of the NIR and XUVfields on the two-color angle-resolved photoelectron spectra of He and Ne is presented. [...]
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2016-08-10
13:50
OpenAccess [PUBDB-2016-02922] Journal Article
; ; ; et al
Simultaneous Operation of Two Soft X-Ray Free-Electron Lasers Driven by One Linear Accelerator
ddc:530
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 orders of magnitude more pulses in this time span due to its superconducting accelerator technology. [...]
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2016-08-10
13:36
[PUBDB-2016-02918] Journal Article
; ; ; et al
Free-Electron Laser Multiplex Driven by a Superconducting Linear Accelerator
ddc:540
Free-electron lasers (FELs) generate femtosecond XUV and X-ray pulses at peak powers in the gigawatt range. The FEL user facility FLASH at DESY (Hamburg, Germany) is driven by a superconducting linear accelerator with up to 8000 pulses per second. [...]
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2016-08-03
16:19
OpenAccess [PUBDB-2016-02786] Journal Article/Contribution to a conference proceedings
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FLASH2: Operation, Beamlines, and Photon Diagnostics
12TH INTERNATIONAL CONFERENCE ON SYNCHROTRON RADIATION INSTRUMENTATION – SRI2015, SRI2015, Meeting locationNew York, NY USA, 6 Jul 2015 - 10 Jul 20152015-07-062015-07-10
AIP conference proceedings 1741, 020008 (2016) [10.1063/1.4952787]  GO
ddc:530
FLASH2, a major extension of the soft X-ray free-electron laser FLASH at DESY, turns FLASH into a multiuser FEL facility. A new undulator line is located in a separate accelerator tunnel and driven additionally by the FLASH linear accelerator. [...]
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2016-07-08
10:42
OpenAccess [PUBDB-2016-02568] Contribution to a conference proceedings/Contribution to a book
; ; ; et al
Operation of Free Electron Laser FLASH Driven by Short Electron Pulses
7th International Particle Accelerator Conference, IPAC16, Meeting locationBusan, Korea, 8 May 2016 - 13 May 20162016-05-082016-05-13
732-734 (2016)
The program of low charge mode of operation is under development at free electron laser FLASH aiming in single mode radiation pulses. A short pulse photoinjector laser has been installed at FLASH allowing production of ultrashort electron pluses with moderate compression factor of the beam formation system. [...]
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2016-06-30
12:50
[PUBDB-2016-02444] Journal Article
; ; ; et al
Polarization control in an X-ray free-electron laser
ddc:530
X-ray free-electron lasers are unique sources of high-brightness coherent radiation. However, existing devices supply only linearly polarized light, precluding studies of chiral dynamics. [...]
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