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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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Journal ArticleDOI
TL;DR: In this article, the lifetime and time resolved fluorescence spectra of standard compounds (quinine sulfate and fluorescein anion) were measured and compared to those of conventional “nanosecond” flash lamps.

58 citations

Journal ArticleDOI
TL;DR: In this article, a complete theory of spatial coherence for undulator radiation sources is presented, which makes consistent use of dimensionless analysis, allowing relatively easy treatment and physical understanding of many asymptotes of the parameter space.
Abstract: This article describes a complete theory of spatial coherence for undulator radiation sources. Current estimations of coherence properties often assume that undulator sources are quasi-homogeneous, like thermal sources, and rely on the application of the van Cittert–Zernike theorem for calculating the degree of transverse coherence. Such assumption is not adequate when treating third generation light sources, because the vertical (geometrical) emittance of the electron beam is comparable or even much smaller than the radiation wavelength in a very wide spectral interval that spans over four orders of magnitude (from 0.1 up to 10 3 A ). Sometimes, the so-called Gaussian–Schell model, that is widely used in statistical optics in the description of partially coherent sources, is applied as an alternative to the quasi-homogeneous model. However, as we will demonstrate, this model fails to properly describe coherent properties of X-ray beams from non-homogeneous undulator sources. As a result, a more rigorous analysis is required. We propose a technique, based on statistical optics and Fourier optics, to explicitly calculate the cross-spectral density of an undulator source in the most general case, at any position after the undulator. Our theory, that makes consistent use of dimensionless analysis, allows relatively easy treatment and physical understanding of many asymptotes of the parameter space, together with their region of applicability. Particular emphasis is given to the asymptotic situation when the horizontal emittance is much larger than the radiation wavelength, and the vertical emittance is arbitrary. This case is practically relevant for third generation synchrotron radiation sources.

58 citations

Journal ArticleDOI
TL;DR: An overview of synchrotron radiation based radiometry can be found in this article, where the storage rings are used as calculable broadband radiation sources (primary source standards) and in combination with primary detector standards as sources of continuously tunable monochromatic radiation for detector calibration.
Abstract: Electron storage rings are nearly ideal radiation sources for radiometry over a broad spectral range from the infrared to the x-ray region. Many national metrology institutes make extensive use of synchrotron radiation for radiometry. The Synchrotron Ultraviolet Radiation Facility SURF III, which has recently been upgraded, is used by the National Institute of Standards and Technology (NIST), and the Physikalisch-Technische Bundesanstalt (PTB) operates a European radiometry laboratory at the third-generation storage ring BESSY II. The storage rings are used as calculable broadband radiation sources (primary source standards) and in combination with primary detector standards as sources of continuously tunable monochromatic radiation for detector calibration. The use of cryogenic electrical-substitution radiometers as primary detector standards has made it possible to considerably extend high-accuracy calibrations from the ultraviolet (UV) to the x-ray regime. Radiometry in the extreme UV (EUV) range, and in particular reflectometry, has become increasingly important for the development of EUV lithography. An overview of synchrotron radiation based radiometry will be given.

58 citations

Journal ArticleDOI
TL;DR: In this paper, an evacuated, temperature-controlled cell has been built for use on the small-angle X-ray scattering instrument D24 at the synchrotron radiation facility LURE.
Abstract: An evacuated, temperature-controlled cell has been built for use on the small-angle X-ray scattering instrument D24 at the synchrotron radiation facility LURE. The sample is placed in a quartz capillary sealed in a stainless-steel holder using a vacuum-tight glue. Several O rings provide a vacuum path upstream and downstream from the cell, so that the X-ray beam only meets the capillary walls and the solution under study between the slits and the beam stop, while the sample is maintained under atmospheric pressure. The cell temperature is controlled via a water circulation through a copper sheath in tight contact with the steel holder. The use of this cell results in a marked reduction of the background, as observed in two series of parallel experiments using a conventional cell and this evacuated cell. The decrease ranges from a factor of 2 at s 1 values larger than 0.008 A−1 to more than 15 at s = 0.00116 A−1, where s is the modulus of the scattering vector (s = 2sin θ/λ, 2θ is the scattering angle and λ is the wavelength of the X-rays).

58 citations

Journal ArticleDOI
TL;DR: In this article, a simulation of synchrotron-self Compton (SSC) emission from a rotation-powered pulsar is presented, where the radiating particles are assumed to be both accelerated primary electrons and a spectrum of electron-positron pairs produced in cascades near the polar cap.
Abstract: Results of a simulation of synchrotron-self Compton (SSC) emission from a rotation-powered pulsar are presented. The radiating particles are assumed to be both accelerated primary electrons and a spectrum of electron-positron pairs produced in cascades near the polar cap. They follow trajectories in a slot gap using 3D force-free magnetic field geometry, gaining pitch angles through resonant cyclotron absorption of radio photons, radiating and scattering synchrotron emission at high altitudes out to and beyond the light cylinder. Full angular dependence of the synchrotron photon density is simulated in the scattering and all processes are treated in the inertial observer frame. Spectra for the Crab and Vela pulsars as well as two energetic millisecond pulsars, B1821-24 and B1937+21 are simulated using this model. The simulation of the Crab pulsar radiation can reproduce both the flux level and the shape of the observed optical to hard X-ray emission assuming a pair multiplicity of M+ = 3x10(exp 5), as well as the very-high- energy emission above 50 GeV detected by MAGIC and VERITAS, with both the synchrotron and SSC components reflecting the shape of the pair spectrum. Simulations of Vela, B1821-24 and B1937+21, for M+ up to 10(exp 5), do not produce pair SSC emission that is detectable by current telescopes, indicating that only Crab-like pulsars produce significant SSC components. The pair synchrotron emission matches the observed X-ray spectrum of the millisecond pulsars and the predicted peak of this emission at 1-10 MeV would be detectable with planned Compton telescopes.

58 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023266
2022661
2021203
2020258
2019288
2018260