New infrared undulator beamline at FLASH

Gensch, Michael; Bittner, L.; Chesnov, A.F.; Delsim-Hashemi, H.; Drescher, Markus; Faatz, B.; Feldhaus, J.; Fruehling, Ulrike; Geloni, Gianluca; Gerth, Ch.; Grimm, O.; Hahn, Ulrich; Hesse, M.; Kapitzki, Svea; Kocharyan, Vitali; Kozlov, O. S.; Matyushevsky, E.A.; Morozov, N.; Petrov, D.; Ploenjes, Elke; Roehling, M.; Rossbach, Joerg; Saldin, E.L.; Schmidt, B.; Schmueser, Peter; Schneidmiller, E.A.; Syresin, Evgeny; Willner, A.; Yurkov, M.V.

doi:10.1016/j.infrared.2007.12.032

Cited by 93 publications

(76 citation statements)

References 12 publications

(7 reference statements)

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“…Several two-color studies employing optical [125][126][127] and terahertz [124,128] radiation synchronized with EUV pulses have been recently reported, and the development of the beam-splitter setups [122,123] XFELs, multiphoton and time-resolved experiments discussed here can be extended deep into the X-ray domain. As mentioned in the Introduction, this will open the way for a number of novel imaging techniques, including the possibility of coherent diffraction imaging of nanoscale objects [132,133] and recording "molecular movies" of light-induced chemical reactions via time-resolved X-ray diffraction or photoelectron holography [76].…”

Section: Discussionmentioning

confidence: 98%

Exploring few-photon, few-electron reactions at FLASH: from ion yield and momentum measurements to time-resolved and kinematically complete experiments

Rudenko

Jiang

Курка

et al. 2010

J. Phys. B: At. Mol. Opt. Phys.

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Abstract:In this contribution we briefly review a series of recent pioneering experiments on fewphoton-induced multiple fragmentation of atoms and molecules performed at the Free electron LASer at Hamburg (FLASH) using a "Reaction Microscope", i.e., a coincident momentum imaging technique. For atoms we consider the most basic non-linear process, namely direct or sequential two-photon double ionization (TPDI). In particular benchmark data for theory are presented such as recoil-ion momentum distributions for direct TPDI of He and Ne, and fully differential data for sequential TPDI of Ne. For molecules we show how one can identify contributions from different reaction channels by inspecting the measured kinetic energy and angular distributions of ionic fragments, and even infer the time-delay between the two photon absorption events in TPDI by detailed comparison with theory.Finally, we describe a novel split mirror arrangement for EUV-pump -EUV-probe experiments, and present the very first time-resolved data on the dynamics of N 2 molecules irradiated by the FLASH light.

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Section: Discussionmentioning

confidence: 98%

Exploring few-photon, few-electron reactions at FLASH: from ion yield and momentum measurements to time-resolved and kinematically complete experiments

Rudenko

Jiang

Курка

et al. 2010

J. Phys. B: At. Mol. Opt. Phys.

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“…Furthermore, THz radiation can serve as a pump. Here, FLASH offers the possibility to use a THz pulse created by the same electron bunch as the FEL radiation [33]. Hence, the jitter is minimal and measurements can be performed under phase-stable conditions.…”

Section: Discussionmentioning

confidence: 99%

Ultrafast Dynamics of Magnetic Domain Structures Probed by Coherent Free-Electron Laser Light

Müller

Schleitzer

Gutt

et al. 2013

Synchrotron Radiation News

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2 INTRODUCTIONThe free-electron laser (FEL) sources FLASH in Hamburg, LCLS at Stanford and FERMI in Trieste provide XUV to soft x-ray radiation (FLASH and FERMI) or soft to hard x-ray radiation (LCLS) with unprecedented parameters in terms of ultrashort pulse length, high photon flux, and coherence. These properties make FELs ideal tools for studying ultrafast dynamics in matter on a previously unaccessible level. This paper reviews first results obtained at FEL sources during the last years in the field of magnetism research. We start with pioneering experiments at FLASH demonstrating the feasibility of magnetic scattering at FELs [1,2], then present pump-probe scattering experiments [3,4] as well as the first FEL magnetic imaging experiments [5], and finally discuss a limitation of the scattering methods due to a quenching of the magnetic scattering signal by high-fluence FEL pulses [6]. All of the presented experiments exploit the x-ray magnetic circular dichroism effect [7,8] to obtain element-specific magnetic scattering contrast, as known from synchrotron experiments [9][10][11][12].One of the key problems in modern magnetism research, ultrafast demagnetization discovered by Beaurepaire in 1996 [13], acts on time scales of a few 100 fs, which are not accessible at standard synchrotron radiation sources. Since its discovery, ultrafast demagnetization was studied using optical femtosecond lasers, for a review see e. g.[14], and femtoslicing sources [15] at storage ring sources [16,17]. In both cases, spatial resolution is limited due to wavelength or flux limitations. In contrast, FELs combine high time resolution, element selectivity, and the spatial resolving power of xrays with high photon flux and excellent coherence properties. FEL sources, therefore, promise a pivotal step forward in the investigation of ultrafast phenomena on nanometer length scales. The rapid development of the FELs with respect to even shorter pulses, increased pulse stability, and special double-pulse schemes, e. g. for ultrafast movies [18], will open up exciting new opportunities in the field of material science. RESONANT SCATTERING FROM MAGNETIC DOMAIN SYSTEMSThe very first proof-of-principle resonant magnetic scattering experiment at x-ray FEL sources was carried out at FLASH in Hamburg [1]. In 2009 FLASH covered a photon energy range in the fundamental from 6.5 up to 50 nm with the routinely used cobalt L 3 -edge at 1.59 nm out of reach. However, by using the higher harmonics of the radiation 3 shorter wave length can be reached on the expense of photon flux. In this experiment FLASH was fine tuned to a fundamental wave length of 7.97 nm which results in the fifth harmonic located at the cobalt L 3 -edge. The scattering pattern from magnetic domains of a cobalt/palladium multilayer system with a perpendicular magnetic anisotropy and typical domain widths in the 100 nm range was recorded. This demonstrated that magnetic scattering as it is performed at synchrotron radiation sources is feasible at FELs. However, the fifth harmo...

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“…Note that the scaling with λ streak reduces the required light intensities I ≈ E 2 by many orders of magnitude upon changing streaking wavelengths from the near-infrared to the far-infrared (= THz) regime. In the THz field driven streak camera experiment at FLASH 13.5 nm pulses are collinearly overlapped with intense linearly polarised THz-pulses from the FLASH THz undulator [18,19] in a gas target (krypton or xenon). The gas atoms are ionised by the XUV pulses.…”

Section: Single-shot Measurement Of Xuv Pulse Durationmentioning

confidence: 99%

Time-diagnostics for improved dynamics experiments at XUV FELs

Drescher

Frühling

Krikunova

et al. 2010

J. Phys. B: At. Mol. Opt. Phys.

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Abstract. Significantly structured and fluctuating temporal profiles of pulses from SASE free electron lasers as well as their unstable timing requires time-diagnostics on a single-shot basis. The duration and structure of XUV pulses from the Free Electron Laser in Hamburg (FLASH) are becoming accessible using a variation of the streak camera principle, where photoemitted electrons are energetically streaked in the electric field component of a terahertz electromagnetic wave. The timing with respect to an independently generated laser pulse can be measured in an XUV/laser cross-correlator, based on a non-collinear superposition of both pulses on a solid state surface and detection of XUV-induced modulations of its reflectivity for visible light. Sorting of data according to the measured timing dramatically improves the temporal resolution of an experiment sampling the relaxation of transient electronic states in xenon after linear-as well as non-linear excitation with intense XUV pulses from FLASH.

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New infrared undulator beamline at FLASH

Cited by 93 publications

References 12 publications

Exploring few-photon, few-electron reactions at FLASH: from ion yield and momentum measurements to time-resolved and kinematically complete experiments

Exploring few-photon, few-electron reactions at FLASH: from ion yield and momentum measurements to time-resolved and kinematically complete experiments

Ultrafast Dynamics of Magnetic Domain Structures Probed by Coherent Free-Electron Laser Light

Time-diagnostics for improved dynamics experiments at XUV FELs

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