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2019-01-03
13:17
[PUBDB-2019-00026] Journal Article
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The hit-and-return system enables efficient time-resolved serial synchrotron crystallography
Nature methods 15(11), 901 - 904 () [10.1038/s41592-018-0180-2]  GO
We present a ‘hit-and-return’ (HARE) method for time-resolved serial synchrotron crystallography with time resolution from milliseconds to seconds or longer. Timing delays are set mechanically, using the regular pattern in fixed-target crystallography chips and a translation stage system [...]
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ddc:610
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2018-08-31
13:03
OpenAccess [PUBDB-2018-03318] Book/Report/Dissertation / PhD Thesis
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High Precision Transverse Emittance Measurement for Novel Plasma Accelerators at the REGAE Linac
[DESY-THESIS-2018-025]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 186 pages: illustrations, figures () [10.3204/PUBDB-2018-03318] = Dissertation, Universität Hamburg, 2017  GO
The small 5 MeV linear accelerator REGAE at DESY produces ultra short and low charge electron bunches, on the one hand to resolve the excitation transitions of atoms temporally by pump-probe electron diffraction experiments and on the other hand to investigate principal mechanisms of laser plasma acceleration. In this context the external injection of the REGAE electron bunch as a probe of the generated plasma wakefield is planned. [...]
OpenAccess: Dissertation_MaxHachmann - Download fulltextPDF Download fulltextPDF (PDFA); desy-thesis-18-025.title - Download fulltextPDF Download fulltextPDF (PDFA);

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2018-07-30
14:12
OpenAccess [PUBDB-2018-02727] Book/Report/Dissertation / PhD Thesis
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Next Generation PIRL for Surgery and Bio-Diagnostics
[DESY-THESIS-2018-021]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS 139 pp. () [10.3204/PUBDB-2018-02727] = Dissertation, Universität Hamburg, 2018  GO
Recent studies show that scar-free surgery is possible with picosecondlaser pulses tuned to the strong absorption band of water in the Mid-IR. Away to generate these pulses is with an optical parametric amplifier (OPA)pumped by a picosecond infrared laser (PIRL). [...]
OpenAccess: Kruber - Download fulltextPDF Download fulltextPDF (PDFA); Dissertation Sebastian Kruber - Download fulltextPDF Download fulltextPDF (PDFA);

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2018-01-02
08:52
Embargoed OpenAccess [PUBDB-2018-00001] Journal Article
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Thermal x-ray diffraction and near-field phase contrast imaging
epl 120(1), 16003 () [10.1209/0295-5075/120/16003]  GO
Using higher-order coherence of thermal light sources, the resolution power of standard x-ray imaging techniques can be enhanced. In this work, we applied the higher-order measurement to far-field x-ray diffraction and near-field phase contrast imaging (PCI), in order to achieve superresolution in x-ray diffraction and obtain enhanced intensity contrast in PCI. [...]
Published on 2017-12-27. Available in OpenAccess from 2018-12-27.: Download fulltextPDF Download fulltextPDF (PDFA); Restricted: Download fulltextPDF Download fulltextPDF (PDFA);
ddc:530
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2017-12-22
10:33
OpenAccess [PUBDB-2017-14028] Journal Article
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Radiation damage free ghost diffraction with atomic resolution
The x-ray free electron lasers can enable diffractive structural determination of protein nanocrystals and single molecules that are too small and radiation-sensitive for conventional x-ray diffraction. However the electronic form factor may be modified during the ultrashort x-ray pulse due to photoionization and electron cascade caused by the intense x-ray pulse. [...]
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ddc:530
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2017-08-29
10:31
OpenAccess [PUBDB-2017-10022] Journal Article
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Compression of high-density 0.16 pC electron bunches through high field gradients for ultrafast single shot electron diffraction: The Compact RF Gun
Structural dynamics 4(4), 044016 () [10.1063/1.4979970]  GO
We present an RF gun design for single shot ultrafast electron diffraction experiments that can produce sub-100 fs high-charge electron bunches in the 130 keV energy range. Our simulations show that our proposed half-cell RF cavity is capable of producing 137 keV, 27 fs rms (60 fs FWHM), 106 electron bunches with an rms spot size of 276 μm and a transverse coherence length of 2.0 nm. [...]
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ddc:530
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2017-08-21
15:12
[PUBDB-2017-09601] Journal Article
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An endstation for resonant inelastic X-ray scattering studies of solid and liquid samples
A novel experimental setup is presented for resonant inelastic X-ray scattering investigations of solid and liquid samples in the soft X-ray region for studying the complex electronic configuration of (bio)chemical systems. The uniqueness of the apparatus is its high flexibility combined with optimal energy resolution and energy range ratio. [...]
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ddc:540
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2017-04-06
08:33
OpenAccess [PUBDB-2017-01527] Journal Article
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Study on laser characteristics of Ho:YLF regenerative ampliers: Operation regimes, gain dynamics, and highly stable operation points
We present a comprehensive study of laser pulse amplification of Ho:YLF regenerative amplifiers (RAs) with respect to operation regimes, gain dynamics, and output pulse stability. The findings are expected to be more generic than for this specific gain material. [...]
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ddc:530
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2017-03-21
16:21
[PUBDB-2017-01439] Journal Article
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Hot carrier relaxation in CdTe via phonon–plasmon modes
Carrier and lattice dynamics of laser excited CdTe was studied by time-resolved reflectivity for excitation fluences spanning about three orders of magnitude, from 0.064 to 6.14 mJ cm$^{−2}$. At fluences below 1 mJ cm$^{−2}$ the transient reflectivity is dominated by the dynamics of hybrid phonon–plasmon modes. [...]
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ddc:530
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2017-01-16
11:23
OpenAccess [PUBDB-2017-00571] Journal Article/Contribution to a conference proceedings/Contribution to a book
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High energetic and highly stable pulses from a Ho:YLF regenerative amplifier
Solid State Lasers XXV: Technology and Devices
Solid State Lasers XXV: Technology and Devices, SPIE LASE, San FranciscoSan Francisco, California, 15 Jul 2016 - 20 Jul 20162016-07-152016-07-20
Proceedings of SPIE 9726, 97260S () [10.1117/12.2212236]  GO
We present results from our Ho:YLF regenerative amplifier (RA) producing up to 6.9 mJ at a repetition rate of 1 kHz and up to 12.9 mJ at a repetition rate of 10 Hz. At 1 kHz, we observe strongly bifurcating pulses, starting with certain round trip number, but the measurements identify a highly stable operation point that lies “hidden” beyond the instability region. [...]
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ddc:620
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