Beam-position monitors in the X-ray undulator beamline at PETRA

Hahn, Ulrich; Brefeld, W.; Hesse, M.; Schneider, J.R.; Schulte‐Schrepping, H.; Seebach, M.; Werner, M.

doi:10.1107/s0909049597013940

Cited by 5 publications

(5 citation statements)

References 4 publications

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“…Third-generation synchrotron sources with undulators pose even greater demands on positioning devices, given the increased heat load and distances of up to 55 m between the undulator and ®rst optical element. It is no wonder that considerable effort has been devoted to developing`white beam' position monitors (Mortazavi et al, 1986;Johnson & Oversluizen, 1989;Warwick et al, 1992;Fauchet et al, 1992;Sakae et al, 1997;Hahn et al, 1998;Shu et al, 1998). Combined with advances in global orbit feedback technology, these devices have been able to limit displacement of the electron orbit to within a few micrometers, with the possibility of direct feedback detection in the sub-micrometer range (Miyahara & Mitsuhashi, 1992).…”

Section: Introductionmentioning

confidence: 99%

Design of a vacuum-compatible high-precision monochromatic beam-position monitor for use with synchrotron radiation from 5 to 25 keV

Alkire

Rosenbaum

Evans

2000

J Synchrotron Radiat

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The Structural Biology Center beamline, 19ID, has been designed to take full advantage of the highly intense undulator radiation and very low source emittance available at the Advanced Photon Source. In order to keep the X-ray beam focused onto the pre-sample slits, a novel position-sensitive PIN diode array has been developed. The array consists of four PIN diodes positioned upstream of a 0.5 microm-thick metal foil placed in the X-ray beam. Using conventional difference-over-the-sum techniques, two-dimensional position information is obtained from the metal foil fluorescence. Because the full X-ray beam passes through the metal foil, the true beam center-of-mass is measured. The device is compact, inexpensive to construct, operates in a vacuum and has a working range of 8 mm x 10 mm that can be expanded with design modifications. Measured position sensitivity is 1-2 microm. Although optimized for use in the 5-25 keV energy range, the upper limit can be extended by changing metals or adjusting foil thickness.

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Section: Introductionmentioning

confidence: 99%

Design of a vacuum-compatible high-precision monochromatic beam-position monitor for use with synchrotron radiation from 5 to 25 keV

Alkire

Rosenbaum

Evans

2000

J Synchrotron Radiat

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“…Wide angle x-ray scattering (WAXS) is a technique where scattering between xray waves are used [59][60][61]. The analysis for this work is based on scattering that fulfills Bragg's law in Equation 4.1 and where the x-rays were generated with a synchrotron x-ray source [62]. Electrons are accelerated to a speed close to the speed of light.…”

Section: In Situ Wide-angle X-ray Scatteringmentioning

confidence: 99%

Theoretical and experimental studies of ternary and quaternary nitrides for machining and thermoelectric materials

Pilemalm

2019

Linköping Studies in Science and Technology. Dissertations

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Nitrides are used as coatings and thin films for a wide range of applications. The study and use of nitrides in the recent decades have shifted towards ternary, quaternary or even higher order (complex) nitrides. There is an interest to use ternary and quaternary nitrides for machining and thermoelectric materials, because it gives the possibility to choose composition and thereby design the materials properties. This thesis presents research results on TiAlN and and TiAlN-based coatings that are used as hard coatings for machining and on ternary scandium nitrides that are of interest for thin films for thermoelectric applications. The high-pressure high-temperature behavior of cubic TiAlN deposited on cubic boron nitride has been experimentally studied. It has been shown that the spinodal decomposition, which means decomposition into cubic domains enriched in TiN and AlN, is delayed as a result of high pressure compared to ambient pressure. No chemical interaction between coating and substrate occurs. TiZrAlN has been theoretically and experimentally studied at high temperature. The results show that the when Zr-content is decreased and the Al-content is increased the decomposition route changes from nucleation and growth to spinodal decomposition. The microstructure evolution with temperature depends on the initial composition. In the case where the decompositon starts with only spinodal decomposition the microstructure at 1100°C consists of domains that are larger than in the case where the decomposition occurs by nucleation and growth. ScMN 2 (M=V, Nb, Ta) phases have been experimentally demonstrated for M=Nb and Ta in a few studies, but have not been much investigated. In this theseis, their crystal structure, stability, elastic properties, electronic structure and thermoelectric properties have been studied. At 0 K and 0 GPa it has been shown that these three phases are thermodynamically and elastically stable. Additionally, these are narrow-bandgap semiconductors and their thermoelectric properties can be tuned by doping. Pressure has a stabilizing effect on these structures. When pressure increases from 0-150 GPa the elastic constants and moduli increases in the range 53-317 %. v vi Preface This thesis is the result of my work as a Ph.D. student at the Department of Physics, Chemistry and Biology (IFM) of Linköping University in Sweden. During my studies it was unfortunely discovered that I since childhood or even birth suffered from a brain tumor (Gangliocytoma). Because of this sick leave the studies are divided into two periods. From January 2011 to November 2014, I worked in the Nanostructured Materials Division and from October 2017 to April 2019 I worked in the Thin Film Physics Division. On 5th June 2015 I woke up after brain surgery and my tumor had been successfully removed. This made me more motivated to focus on finalizing this thesis after the break in the studies. Furthermore, this thesis is based on and extended from my Licentiate thesis TiAlN-based Coatings at High Pressures and Temperature...

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“…Such cameras typically use a phosphor screen, which converts incident X-ray radiation into visible light, optically coupled to a standard CCD or CMOS detector (Bunk et al, 2005). By using a very thin phosphor screen to reduce beam absorption (Martin et al, 2008) and designing the camera so that it does not obstruct the beam in full (Fuchs et al, 2007;Hahn et al, 1998), a desired configuration for in situ measurements can be obtained. However, a very thin phosphor that has small beam absorption results in a low intensity of the visible light recorded by the camera.…”

Section: Introductionmentioning

confidence: 99%

In situX-ray beam imaging using an off-axis magnifying coded aperture camera system

Kachatkou

Kyele

Scott

et al. 2013

J Synchrotron Radiat

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Beam-position monitors in the X-ray undulator beamline at PETRA

Cited by 5 publications

References 4 publications

Design of a vacuum-compatible high-precision monochromatic beam-position monitor for use with synchrotron radiation from 5 to 25 keV

Design of a vacuum-compatible high-precision monochromatic beam-position monitor for use with synchrotron radiation from 5 to 25 keV

Theoretical and experimental studies of ternary and quaternary nitrides for machining and thermoelectric materials

In situX-ray beam imaging using an off-axis magnifying coded aperture camera system

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