FS-FLASH

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2018-01-12
10:42
[PUBDB-2018-00596] Journal Article
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Short-wavelength free-electron laser sources and science: a review
ddc:530
This review is focused on free-electron lasers (FELs) in the hard to soft x-ray regime. The aim is to provide newcomers to the area with insights into: the basic physics of FELs, the qualities of the radiation they produce, the challenges of transmitting that radiation to end users and the diversity of current scientific applications. [...]
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2018-01-11
13:05
OpenAccess [PUBDB-2018-00478] Journal Article
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Momentum-resolved photoelectron absorption in surface barrier scattering on Ir(111) and graphene/Ir(111)
ddc:530
Time-of-flight momentum microscopy reveals sixfold symmetric sharp features of decreased intensity (dark lines) in constant-energy maps for clean Ir(111) and graphene/Ir(111). The dark lines have been observed for $p$- and $s$-polarized light in the photon-energy range of 20–27 eV and result from scattering of photoelectrons at the surface potential barrier [...]
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2018-01-10
13:15
OpenAccess [PUBDB-2018-00331] Journal Article
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Spin-filtered time-of-flight $k$-space microscopy of Ir – Towards the “complete” photoemission experiment
ddc:570
The combination of momentum microscopy (high resolution imaging of the Fourier plane) with an imaging spin filter has recently set a benchmark in k-resolution and spin-detection efficiency. Here we show that the degree of parallelization can be further increased by time-of-flight energy recording. [...]
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2018-01-10
13:13
OpenAccess [PUBDB-2018-00329] Journal Article
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Vectorial spin polarization detection in multichannel spin-resolved photoemission spectroscopy using an Ir(001) imaging spin filter
ddc:530
We report on spin- and angular-resolved photoemission spectroscopy using a high-resolution imaging spin filter based on a large Ir(001) crystal enhancing the effective figure of merit for spin detection by a factor of over 10$^3$ compared to standard single-channel detectors. Furthermore, we review the spin filter preparation and its lifetime [...]
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2018-01-09
16:34
Embargoed OpenAccess [PUBDB-2018-00300] Journal Article
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Hosting of surface states in spin–orbit induced projected bulk band gaps of W(1 1 0) and Ir(1 1 1)
ddc:530
Spin-momentum locking of surface states has attracted great interest in recent years due to envisioned technological applications in the field of spintronics. Normal metal surfaces like W(1 1 0) and Ir(1 1 1) show surface states with energy dispersions and spin-polarization textures, which are reminiscent of topologically non-trivial surface states. [...]
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2018-01-09
16:17
OpenAccess [PUBDB-2018-00296] Journal Article
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High-resolution resonant inelastic extreme ultraviolet scattering from orbital and spin excitations in a Heisenberg antiferromagnet
ddc:530
We report a high-resolution resonant inelastic extreme ultraviolet (EUV) scattering study of the quantum Heisenberg antiferromagnet KCoF$_3$. By tuning the EUV photon energy to the cobalt M$_{23}$ edge, a complete set of low-energy 3d spin-orbital excitations is revealed [...]
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2017-12-18
11:00
OpenAccess [PUBDB-2017-13615] Contribution to a conference proceedings
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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 3 pp. (2017) [10.3204/PUBDB-2017-13615]  GO
The superconducting free-electron laser user facility FLASH at DESY in Hamburg, routinely produces several thousand photon pulses per second. The operational parameters cover a wavelength range from 90 nm down to 4 nm with pulse energies from several $\mu$J up to 1 mJ and with pulse durations of several hundred fs down to a few fs. [...]
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2017-12-18
10:52
OpenAccess [PUBDB-2017-13612] 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  GO
The superconducting free-electron laser user facility FLASH at DESY in Hamburg, routinely produces several thousand photon pulses per second. The operational parameters cover a wavelength range from 90 nm down to 4 nm with pulse energies from several $\mu$J up to 1 mJ and with pulse durations of several hundred fs down to a few fs. [...]
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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
ddc:540
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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2017-11-29
17:42
OpenAccess [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) [10.3204/PUBDB-2017-12552]  GO
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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