Topic
Synchrotron radiation
About: Synchrotron radiation is a research topic. Over the lifetime, 14639 publications have been published within this topic receiving 244775 citations. The topic is also known as: magnetobremsstrahlung radiation & Synchrotron Radiation.
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TL;DR: In this paper, synchrotron X-ray imaging is used for in situ studies of single-crystal structure and defects in nickel-base superalloys, including dislocations and mosaicity.
61 citations
TL;DR: Existing indirect X-ray image detectors commonly used at synchrotron light sources can be adapted for fast image acquisition by employing CMOS-based digital high speed cameras already available on the market.
Abstract: Time-resolved imaging with penetrating radiation has an outstanding scientific value but its realisation requires a high density of photons as well as corresponding fast X-ray image detection schemes. Bending magnets and insertion devices of third generation synchrotron light sources offer a polyc hromatic photon flux density which is high enough to perform h ard X-ray imaging with a spatio-temporal resolution up to the µm-µs range. Existing indirect X-ray image detectors commonly used at synchrotron light sources can be adapted for fast image acquisition by employing CMOS-based digital high speed cameras already available on the market. Selected applications from life sciences and materials research underline the high potential of this high-speed hard X-ray microimaging approach.
61 citations
TL;DR: In this article, the authors examined different possible causes for the energy losses responsible for the e-folding time of 2.31± 0.19 hours of that flare and concluded that the fading of the emission is due to the leakage of electrons themselves at each reflection between the two mirror points of the magnetic stru cure partially trapping them.
Abstract: The pre-main sequence binary system V773 Tau A shows remarkable flaring activity around periastron passage. Here, we present the observation of such a flare at a wavelengt h of 3 mm (90 GHz) performed with the Plateau de Bure Interferometer. ⋆ We examine different possible causes for the energy losses responsible for the e-folding time of 2.31± 0.19 hours of that flare. We exclude synchrotron, collisional, an d inverse Compton losses because they are not consistent with observational constraints, and we propose that the fading of the emission is due to the leakage of electrons themselves at each reflection between the two mirror points of the magnetic stru cture partially trapping them. The magnetic structure compatible with both our leakage model and previous observations is that of a helmet streamer that, as in the solar case, can occur at t he top of the X-ray-emitting, stellar-sized coronal loops of one o f the stars. The streamer may extend up to∼ 20 R∗ and interact with the corona of the other star at periastron passage, causing r ecurring flares. The inferred magnetic field strength at the t wo mirror points of the helmet streamer is in the range 0.12 - 125 G, and the corresponding Lorentz factor,γ, of the partially trapped electrons is in the range 20<γ< 632. We therefore rule out that the emission could be of gyro-synchrotron nature: the derived high Lorentz factor proves that the nature of the emission at 90 GHz from this pre-main binary system is synchrotron radiation.
61 citations
TL;DR: In this paper, a time resolved core level spectroscopy study was performed on photoexcited Si(111)2×1 surfaces with subnanosecond resolution, which enabled measuring band bending fluctuations, caused by surface carrier dynamics, during the first nanosecond after photoexcitation; differences in the Si2p core level lineshape, dependent on the pumpprobe time delay, were also observed.
Abstract: Combining the use of a UV storage ring free electron laser and of synchrotron radiation, a time resolved core level spectroscopy study has been performed on photoexcited Si(111)2×1 surfaces with subnanosecond resolution. This enabled us to measure band bending fluctuations, caused by surface carrier dynamics, during the first nanosecond after photoexcitation; differences in the Si2p core level lineshape, dependent on the pump-probe time delay, were also observed. The presence of defects was found to reduce the fluctuations and make the carrier recombination process faster.
61 citations
TL;DR: In this article, the emission, absorption, polarization, and birefringent properties of a magnetized, relativistic, Maxwellian electron plasma are oomputed, and a uniform, isothermal Maxwellian source model has been fitted to the radio and X-ray spectrum of 3C 273.
Abstract: The emission, absorption, polarization, and birefringent properties of a magnetized, relativistic, Maxwellian electron plasma are oomputed. The Maxwellian synchrotron source is notable for the near absence of Faraday rotation and polarization conversion. When opaque, the emission from a Maxwellian synchrotron source is Planckian, and hence unpolarized. The first-order self-Compton spectrum includes a high-frequency tail which extends well beyond the nominal cutoff frequency. The self-Compton spectral flux is simply related to the source Compton optical depth, and it is argued that only at ..gamma..-ray energies would the second-order self-Compton emission be significant for realistic particle distributions and typical source parameters. To illustrate the basic properties of Maxwellian sources, a uniform, isothermal Maxwellian source model has been fitted to the radio and X-ray spectrum of 3C 273.
61 citations