CFEL-ARD

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2018-07-30
14:12
OpenAccess [PUBDB-2018-02727] Book/Report/Dissertation / PhD Thesis

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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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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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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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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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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2017-01-09
14:47
Embargoed OpenAccess [PUBDB-2017-00332] Journal Article
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Measurement of Ultra Low Transverse Emittance at REGAE
The linear accelerator REGAE at DESY produces short and low charged 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. For both cases a high quality electron beam is required which can be identified with a small beam emittance. [...]
Published on 2016-01-27. Available in OpenAccess from 2017-01-27.: Download fulltextPDF; Restricted: Download fulltextPDF;
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2017-01-06
16:05
[PUBDB-2017-00240] Journal Article
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Fixed target combined with spectral mapping: approaching 100% hit rates for serial crystallography
The advent of ultrafast highly brilliant coherent X-ray free-electron laser sources has driven the development of novel structure-determination approaches for proteins, and promises visualization of protein dynamics on sub-picosecond timescales with full atomic resolution. Significant efforts are being applied to the development of sample-delivery systems that allow these unique sources to be most efficiently exploited for high-throughput serial femtosecond crystallography. [...]
ddc:570
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