Journal Article

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2018-04-18
18:06
[PUBDB-2018-01788] Journal Article
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Attosecond time–energy structure of X-ray free-electron laser pulses
The time–energy information of ultrashort X-ray free-electron laser pulses generated by the Linac Coherent Light Source is measured with attosecond resolution via angular streaking of neon 1s photoelectrons. The X-ray pulses promote electrons from the neon core level into an ionization continuum, where they are dressed with the electric field of a circularly polarized infrared laser. [...]
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2018-04-18
15:22
OpenAccess [PUBDB-2018-01787] Journal Article
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Multidimensional photoemission spectroscopy—the space-charge limit
Photoelectron spectroscopy, especially at pulsed sources, is ultimately limited by the Coulomb interaction in the electron cloud, changing energy and angular distribution of the photoelectrons. A detailed understanding of this phenomenon is crucial for future pump–probe photoemission studies at (x-ray) free electron lasers and high-harmonic photon sources. [...]
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2018-04-18
15:11
[PUBDB-2018-01786] Journal Article
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Silica Aerogel Radiators for Bunch Length Measurements
Cherenkov radiators based on silica aerogel are used to measure the electron bunch length at the photo injector test facility at DESY Zeuthen (PITZ). The energy range of those electrons is 4–5 MeV. [...]
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2018-04-18
13:04
[PUBDB-2018-01785] Journal Article
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Collective resonances of atomic xenon from the linear to the nonlinear regime
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2018-04-18
09:54
OpenAccess [PUBDB-2018-01781] Journal Article

Zwischen Völkerrecht und Frascati: Praktische Aspekte der Ausgestaltung internationaler Kooperationen am Deutschen Elektronen-Synchrotron (DESY)
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ddc:340
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2018-04-13
09:33
OpenAccess [PUBDB-2018-01720] Journal Article
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Velocity-Map Imaging for Emittance Characterization of Multiphoton Electron Emission from a Gold Surface
A velocity-map-imaging spectrometer is demonstrated to characterize the normalized emittance (root-mean-square, rms) of photoemitted electron bunches. Both the two-dimensional spatial distribution and the projected velocity distribution images of photoemitted electrons are recorded by the detection system and analyzed to obtain the normalized emittance (rms). [...]
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2018-04-11
15:06
[PUBDB-2018-01690] Journal Article
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Phase transitions of α-quartz at elevated temperatures under dynamic compression using a membrane-driven diamond anvil cell: Clues to impact cratering?
Abstract–Coesite and stishovite are high-pressure silica polymorphs known to have beenformed at several terrestrial impact structures. They have been used to assess pressure andtemperature conditions that deviate from equilibrium formation conditions. [...]
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2018-04-11
14:58
OpenAccess [PUBDB-2018-01689] Journal Article
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Sterile neutrino dark matter with supersymmetry
Sterile neutrino dark matter, a popular alternative to the WIMP paradigm, has generally been studied in non-supersymmetric setups. If the underlying theory is supersymmetric, we find that several interesting and novel dark matter features can arise [...]
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2018-04-11
14:55
OpenAccess [PUBDB-2018-01688] Report/Journal Article
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Runaway relaxion monodromy
[arXiv:1610.05320; DESY-16-159; MITP-16-108]
We examine the relaxion mechanism in string theory. An essential feature is that an axion winds over $N \gg 1$ fundamental periods. [...]
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2018-04-11
14:41
[PUBDB-2018-01686] Report/Journal Article

Gravitational radiation from a bulk flow model
[DESY-17-227; arXiv:1712.06869]
We perform simulations in a simple model that aims to mimic the hydrodynamic evolution of a relativistic fluid during a cosmological first-order phase transitions. The observable we are concerned with is hereby the spectrum of gravitational radiation produced by colliding fluid shells. [...]
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