FS-FLASH-B

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2017-04-03
10:09
OpenAccess [PUBDB-2017-01521] Journal Article
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Optimization and Characterization of High-Harmonic Generation for Probing Solid Density Plasmas
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The creation of high energy density plasma states produced during laser–solid interaction on a sub-picosecond timescale opens a way to create astrophysical plasmas in the lab to investigate their properties, such as the frequency-dependent refractive index. Available probes to measure absorption and phase-changes given by the complex refractive index of the plasma state are extreme-UV (EUV) and soft X-ray (XUV) ultra-short pulses from high harmonic generation (HHG). [...]
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2017-03-14
18:36
OpenAccess [PUBDB-2017-01374] Internal Report
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Quantum Imaging with Incoherently Scattered Light from a Free-Electron Laser
The advent of accelerator-driven x-ray free-electron lasers (FEL) has opened new avenues for high-resolution structure determination via diffraction methods that go far beyond conventional x-ray crystallography methods. These techniques rely on coherent scattering processes that require the maintenance of first-order coherence of the radiation field throughout the imaging procedure. [...]
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2017-02-02
05:37
OpenAccess [PUBDB-2017-00830] Journal Article
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Correlated electronic decay in expanding clusters triggered by intense XUV pulses from a Free-Electron-Laser
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Irradiation of nanoscale clusters and large molecules with intense laser pulses transforms them into highly-excited non- equilibrium states. The dynamics of intense laser-cluster interaction is encoded in electron kinetic energy spectra, which contain signatures of direct photoelectron emission as well as emission of thermalized nanoplasma electrons. [...]
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2017-01-09
12:38
[PUBDB-2017-00305] Journal Article
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PhotonDiag2015 workshop: introductory overview
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2016-11-17
10:54
[PUBDB-2016-05321] Conference Presentation (After Call)
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Terahertz Radiation Driven Dynamics of Magnetic DomainStructures Probed by Free-Electron Laser Light
61st Annual Conference on Magnetism and Magnetic Materials, MMM, Meeting locationNew Orleans, USA, 31 Oct 2016 - 4 Nov 20162016-10-312016-11-04
Controlling magnetism on ultra-fast time scales and on nanometer lengthscales is a challenge for modern research in magnetism. Means for inducingdynamics on these time scales are femtosecond optical lasers [1] and THzsources [2]. [...]

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2016-08-22
10:42
OpenAccess [PUBDB-2016-03283] Journal Article
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High-Field High-Repetition-Rate Sources for the Coherent THz Control of Matter
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Ultrashort flashes of THz light with low photon energies of a few meV, but strong electric or magneticfield transients have recently been employed to prepare various fascinating nonequilibrium statesin matter. Here we present a new class of sources based on superradiant enhancement of radiationfrom relativistic electron bunches in a compact electron accelerator that we believe will revolutionizeexperiments in this field. [...]
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2012-09-19
19:06
OpenAccess [PHPPUBDB-15286] Journal Article
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Characterization of a two-color pump-probe setup at FLASH using a velocity map imaging spectrometer
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We report on the implementation of a high-count-rate charged particle imaging detector for two-color pump-probe experiments at the free electron laser in Hamburg (FLASH). In doing so, we have developed a procedure for finding the spatial and temporal overlap between the extreme UV free electron laser (FEL) pulses and the IR pulses, which allows for complete alignment of the setup in situations where the region of overlap between the FEL and the IR is not easily accessible by means of imaging optics..
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2012-09-19
18:55
OpenAccess [PHPPUBDB-14883] Journal Article
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EUV Hartmann sensor for wavefront measurements at the Free-electron LASer in Hamburg
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