Achieving and Measuring Sub-Micrometer Beam Stability at 3rd Generation Light Sources

Rehm, Guenther

doi:10.1088/1742-6596/425/4/042001

Cited by 10 publications

(8 citation statements)

References 7 publications

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“…In addition to controlling the beam parameters, ensuring the beam’s stability (Rehm, 2013) is crucial for optimising data quality. In case it is impossible or impractical to identify and remove them, beam-drifts, and to some extent also vibrations, can be stabilized through position feedback schemes.…”

Section: X-ray Source Optics and Diagnosticsmentioning

confidence: 99%

Current advances in synchrotron radiation instrumentation for MX experiments

Owen

Juanhuix

Fuchs

2016

Archives of Biochemistry and Biophysics

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Following pioneering work 40 years ago, synchrotron beamlines dedicated to macromolecular crystallography (MX) have improved in almost every aspect as instrumentation has evolved. Beam sizes and crystal dimensions are now on the single micron scale while data can be collected from proteins with molecular weights over 10 MDa and from crystals with unit cell dimensions over 1000 Å. Furthermore it is possible to collect a complete data set in seconds, and obtain the resulting structure in minutes. The impact of MX synchrotron beamlines and their evolution is reflected in their scientific output, and MX is now the method of choice for a variety of aims from ligand binding to structure determination of membrane proteins, viruses and ribosomes, resulting in a much deeper understanding of the machinery of life. A main driving force of beamline evolution have been advances in almost every aspect of the instrumentation comprising a synchrotron beamline. In this review we aim to provide an overview of the current status of instrumentation at modern MX experiments. The most critical optical components are discussed, as are aspects of endstation design, sample delivery, visualization and positioning, the sample environment, beam shaping, detectors and data acquisition and processing.

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Section: X-ray Source Optics and Diagnosticsmentioning

confidence: 99%

Current advances in synchrotron radiation instrumentation for MX experiments

Owen

Juanhuix

Fuchs

2016

Archives of Biochemistry and Biophysics

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“…The closed orbit correction has been an integral part of synchrotron and storage ring in light sources as well as in hadron machines for stable beam operations [1][2][3]. Closed orbit correction methods are typically classified as "local" or "global" given the spatial extent of their correction.…”

Section: Introductionmentioning

confidence: 99%

Closed orbit correction at synchrotrons for symmetric and near-symmetric lattices

Mirza

Singh

Forck

et al. 2019

Phys. Rev. Accel. Beams

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This contribution compiles the benefits of lattice symmetry in the context of closed orbit correction. A symmetric arrangement of BPMs and correctors results in structured orbit response matrices of Circulant or block Circulant type. These forms of matrices provide favorable properties in terms of computational complexity, information compression and interpretation of mathematical vector spaces of BPMs and correctors. For broken symmetries, a nearest-Circulant approximation is introduced and the practical advantages of symmetry exploitation are demonstrated with the help of simulations and experiments in the context of FAIR synchrotrons.

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“…Beam instability, be it electron or photon beam, ISSN 1600-5775 can be a concern especially to the third-generation facilities. It has adverse effects on the required low electron beam emittance, effective brilliance of the synchrotron radiation, and experiments performed at the experimental stations (Brefeld, 1989;Haga et al, 2000;Galimberti & Borghes, 2004;Rehm, 2013). The causes of beam instability and the methods of reduction have been widely studied (Hettel, 1989;Bocchetta, 1996;Farvacque, 1996;Hettel, 2002), and the drive to ensure and maintain a steady beam has led to the development of different types of beam monitors (Billing, 1988;Izumi et al, 1989;Johnson & Oversluizen, 1989;van Silfhout, 1999;Alkire et al, 2000;Kyele et al, 2005;Bunk et al, 2005;Bergonzo et al, 2006;Ilinski et al, 2007;Tucoulou et al, 2008;Leban et al, 2010;Revesz et al, 2011;Xiao et al, 2012;Muller et al, 2012;Cheng et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

A phase-space beam position monitor for synchrotron radiation

Samadi

Bassey

Martinson

et al. 2015

J Synchrotron Radiat

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The stability of the photon beam position on synchrotron beamlines is critical for most if not all synchrotron radiation experiments. The position of the beam at the experiment or optical element location is set by the position and angle of the electron beam source as it traverses the magnetic field of the bend-magnet or insertion device. Thus an ideal photon beam monitor would be able to simultaneously measure the photon beam's position and angle, and thus infer the electron beam's position in phase space. X-ray diffraction is commonly used to prepare monochromatic beams on X-ray beamlines usually in the form of a double-crystal monochromator. Diffraction couples the photon wavelength or energy to the incident angle on the lattice planes within the crystal. The beam from such a monochromator will contain a spread of energies due to the vertical divergence of the photon beam from the source. This range of energies can easily cover the absorption edge of a filter element such as iodine at 33.17 keV. A vertical profile measurement of the photon beam footprint with and without the filter can be used to determine the vertical centroid position and angle of the photon beam. In the measurements described here an imaging detector is used to measure these vertical profiles with an iodine filter that horizontally covers part of the monochromatic beam. The goal was to investigate the use of a combined monochromator, filter and detector as a phase-space beam position monitor. The system was tested for sensitivity to position and angle under a number of synchrotron operating conditions, such as normal operations and special operating modes where the photon beam is intentionally altered in position and angle at the source point. The results are comparable with other methods of beam position measurement and indicate that such a system is feasible in situations where part of the synchrotron beam can be used for the phase-space measurement.

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Achieving and Measuring Sub-Micrometer Beam Stability at 3rd Generation Light Sources

Cited by 10 publications

References 7 publications

Current advances in synchrotron radiation instrumentation for MX experiments

Current advances in synchrotron radiation instrumentation for MX experiments

Closed orbit correction at synchrotrons for symmetric and near-symmetric lattices

A phase-space beam position monitor for synchrotron radiation

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