Physik der Teilchenbeschleuniger und Synchrotronstrahlungsquellen

Wille, K.

doi:10.1007/978-3-663-11039-2

Cited by 27 publications

(11 citation statements)

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“…A detailed description of synchrotron radiation sources and optical devices can be found, e.g., in [ 2 – 6 ]. The interested reader may also be referred to [ 7 ], in which the electrodynamics behind synchrotron radiation are explained.…”

Section: Introductionmentioning

confidence: 99%

Extended X-ray absorption fine structure of bimetallic nanoparticles

Antoniak¹

2011

Beilstein J. Nanotechnol.

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SummaryElectronic and magnetic properties strongly depend on the structure of the material, especially on the crystal symmetry and chemical environment. In nanoparticles, the break of symmetry at the surface may yield different physical properties with respect to the corresponding bulk material. A useful tool to investigate the electronic structure, magnetic behaviour and local crystallographic structure is X-ray absorption spectroscopy. In this review, recent developments in the field of extended X-ray absorption fine structure measurements and in the analysis methods for structural investigations of bimetallic nanoparticles are highlighted. The standard analysis based on Fourier transforms is compared to the relatively new field of wavelet transforms that have the potential to outperform traditional analysis, especially in bimetallic alloys. As an example, the lattice expansion and inhomogeneous alloying found in FePt nanoparticles is presented, and this is discussed below in terms of the influence of employed density functional theory calculations on the magnetic properties.

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Section: Introductionmentioning

confidence: 99%

Extended X-ray absorption fine structure of bimetallic nanoparticles

Antoniak¹

2011

Beilstein J. Nanotechnol.

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“…The half opening angle θ of the light cone emitted at the centre of the bending magnet is given by the relation between the transverse and longitudinal momentum of the circulating electrons [20] A second point of interest when it comes to synchrotron radiation is the emitted power, which can reach enormous values in high energy machines.…”

Section: Measurements From Mtv0361 Using Synchrotron Lightmentioning

confidence: 99%

Longitudinal beam profile measurements at CTF3 using a streak camera

et al. 2006

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The proposed Compact Linear Collider (CLIC) is a multi-TeV electron-positron collider for particle physics based on an innovative two-beam acceleration concept. A highintensity drive beam powers the main beam of a high-frequency (30 GHz) linac with a gradient of 150 MV/m, by means of transfer structure sections. The aim of the CLIC Test Facility (CTF3) is to make exhaustive tests of the main CLIC parameters and to prove the technical feasibility. One of the points of particular interest is the demonstration of bunch train compression and combination in the Delay Loop and in the Combiner Ring. Thus, detailed knowledge about the longitudinal beam structure is of utmost importance and puts high demands on the diagnostic equipment. Among others, measurements with a streak camera have been performed on the linac part of the CTF3 as well as on the newly installed Delay Loop. This allowed e.g. monitoring of the longitudinal structure of individual bunches, the RF combination of the beam, the behavior during phase shifts and the influence of the installed wiggler. This article first gives an overview of the CTF3 facility, then describes in detail the layout of the long optical lines required for observation of either optical transition radiation or synchrotron radiation, and finally shows first results obtained during the last machine run this year.

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“…The calculation of the impact position can be determined via linear beam optics, following the description given in textbooks as [18,19]. To each ion optical element, a transfer matrix is assigned, which can be applied to particles with momentum deviation, too.…”

Section: Dynamic Vacuum Stabilization Conceptsmentioning

confidence: 99%

“…Each cell in the SIS-100 lattice has been designed as a charge separator for the charge state 29+ of the reference ion U 28+ (see figure 10; a high fraction of U 29+ is kept temporarily in the acceptance and will be scraped off Figure 11. Trajectories in the horizontal plane of radioactive decay products 6 He 2+ → 6 Li 3+ (figure 11(a)) and 18 Ne 10+ → 18 F 9+ ( figure 11(b)) in the proposed PS replacement lattice G7.…”

Section: Sis-100 Lattice Designmentioning

confidence: 99%

Quantitative Effects of Preferred Orientation and Impurity Phases on Ferroelectric Properties of SrBi₂(Ta_1-xNb_x)₂O₉Thin Films Measured by X-Ray Diffraction Reciprocal Space Mapping

Saito¹,

Yamaji²,

Akai³

et al. 2003

Jpn. J. Appl. Phys.

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Intense heavy ion beams from the Gesellschaft für Schwerionenforschung (GSI-Darmstadt) accelerator facilities are investigated for their potential to drive inertial fusion targets and are currently used to generate and probe high-energy-density (HED) matter. The existing heavy ion synchrotron facility SIS-18 delivers intense uranium beam pulses for experiments with up to 4 × 10 9 ions per bunch at a charge state of q = 73+. Higher intensities are potentially available at lower charge states, when related loss mechanisms can be overcome. We have observed intensity-dependent beam losses in SIS-18. The origin of these beam losses is attributed to processes changing the charge state of ions, which is predominantly due to collisions with rest gas atoms. The resulting change in the mass over charge ratio m/q leads to modified trajectories in dispersive beam transport elements, and finally to the loss of the particle at the vacuum tube wall. At the impact position secondary particles are produced by ion-induced desorption and as a result the pressure in the vacuum tube is increased locally. This local rise in pressure in turn leads to increased charge changing processes starting an avalanche process that may eventually lead to a complete loss of the beam during a few turns in the synchrotron. In this paper, we discuss a method to control the problem of desorbed gases with specifically designed beam catchers at critical positions. We have further developed a program package to calculate the most important beam loss mechanisms and to couple them to the dynamic vacuum problem. The basis of this simulation is an ion-optics routine where relevant atomic processes and the effects of dynamic vacuum are implemented.

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Physik der Teilchenbeschleuniger und Synchrotronstrahlungsquellen

Cited by 27 publications

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Extended X-ray absorption fine structure of bimetallic nanoparticles

Extended X-ray absorption fine structure of bimetallic nanoparticles

Longitudinal beam profile measurements at CTF3 using a streak camera

Quantitative Effects of Preferred Orientation and Impurity Phases on Ferroelectric Properties of SrBi₂(Ta_1-xNb_x)₂O₉Thin Films Measured by X-Ray Diffraction Reciprocal Space Mapping

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Physik der Teilchenbeschleuniger und Synchrotronstrahlungsquellen

Cited by 27 publications

References 0 publications

Extended X-ray absorption fine structure of bimetallic nanoparticles

Extended X-ray absorption fine structure of bimetallic nanoparticles

Longitudinal beam profile measurements at CTF3 using a streak camera

Quantitative Effects of Preferred Orientation and Impurity Phases on Ferroelectric Properties of SrBi2(Ta1-xNbx)2O9Thin Films Measured by X-Ray Diffraction Reciprocal Space Mapping

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Quantitative Effects of Preferred Orientation and Impurity Phases on Ferroelectric Properties of SrBi₂(Ta_1-xNb_x)₂O₉Thin Films Measured by X-Ray Diffraction Reciprocal Space Mapping