Steven Kearney
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View article: Method and precision nanopositioning apparatus with compact vertical and horizontal linear nanopositioning flexure stages for implementing enhanced nanopositioning performance
Method and precision nanopositioning apparatus with compact vertical and horizontal linear nanopositioning flexure stages for implementing enhanced nanopositioning performance Open
An enhanced method and precision nanopositioning apparatus for implementing enhanced nanopositioning performance is provided. The nanopositioning apparatus includes a vertical linear nanopositioning flexure stage and a horizontal linear na…
View article: Mechanical design of deformation compensated flexural pivots structured for linear nanopositioning stages
Mechanical design of deformation compensated flexural pivots structured for linear nanopositioning stages Open
A method and deformation compensated flexural pivots structured for precision linear nanopositioning stages are provided. A deformation-compensated flexural linear guiding mechanism includes a basic parallel mechanism including a U-shaped …
View article: Design of the nanopositioning and mechanical system for cavity-based X-ray free electron laser
Design of the nanopositioning and mechanical system for cavity-based X-ray free electron laser Open
With forming of an X-ray cavity with a set of narrow bandwidth diamond Bragg crystals and by storing and recirculating the output of an amplifier in an X- ray cavity so that the X-ray pulse can interact with following fresh electron bunche…
View article: Enhanced microprobe endstation for high-throughput and versatile sample analysis at APS 2-ID
Enhanced microprobe endstation for high-throughput and versatile sample analysis at APS 2-ID Open
The new APS-U 2-ID Microprobe instrument will provide high-throughput and versatile sample analysis capabilities and will bridge the gap to higher resolution APS-U nanoprobes. Available techniques include XRF microscopy, tomography, µXANES…
View article: Development of X-ray Wavefront Sensing Techniques for Adaptive Optics Control at the Advanced Photon Source
Development of X-ray Wavefront Sensing Techniques for Adaptive Optics Control at the Advanced Photon Source Open
The planning and construction of new and upgraded high-brightness X-ray synchrotron and free electron laser sources, such as the Advanced Photon Source upgrade project (APS-U), are driving numerous opportunities to advance X-ray science an…
View article: Possibilities on the Polar beamline at APS
Possibilities on the Polar beamline at APS Open
View article: Prototype design and experimental tests of a zoom mirror system for the APS upgrade
Prototype design and experimental tests of a zoom mirror system for the APS upgrade Open
Mirror-based zoom optics systems can offer variable focal spot sizes over a wide range, which is essential for coherent nanoprobe beamlines, such as the proposed Atomic beamline in the Advanced Photon Source (APS) upgrade project. The succ…
View article: Prostate cancer assessment using MR elastography of fresh prostatectomy specimens at 9.4 T
Prostate cancer assessment using MR elastography of fresh prostatectomy specimens at 9.4 T Open
Purpose Despite its success in the assessment of prostate cancer (PCa), in vivo multiparametric MRI has limitations such as interobserver variability and low specificity. Several MRI methods, among them MR elastography, are currently being…
View article: Collaborative development of diffraction-limited beamline optical systems at US DOE light sources
Collaborative development of diffraction-limited beamline optical systems at US DOE light sources Open
An ongoing collaboration among four US Department of Energy National Laboratories has demonstrated key technology prototypes and software modeling tools required for new high-coherent flux beamline optical systems. New free electron laser …
View article: Nanopositioning flexure stages development for synchrotron radiation instrumentation at the advanced photon source
Nanopositioning flexure stages development for synchrotron radiation instrumentation at the advanced photon source Open
Nanopositioning techniques present an important capability to support the state-of-the-art synchrotron radiation instrumentation research for the Advanced Photon Source (APS) operations and upgrade project. To overcome the performance limi…
View article: Status of the Hard X-Ray Self-Seeding Setup at the European XFEL
Status of the Hard X-Ray Self-Seeding Setup at the European XFEL Open
A Hard X-Ray Self-Seeding (HXRSS) setup will be soon commissioned at the European XFEL. It relies on a two-chicanes scheme to deal, in particular, with the high pulse repetition rate of the facility. In this contribution we review the phys…
View article: Mechanical Design of a Diamond Crystal Hard X-Ray Self-Seeding Monochromator for PAL-XFEL
Mechanical Design of a Diamond Crystal Hard X-Ray Self-Seeding Monochromator for PAL-XFEL Open
As a part of the Argonne Strategic Partnership Project (SPP) 85H21, a collaboration between Advanced Photon Source (APS), Argonne National Laboratory (ANL) and Pohang Accelerator Laboratory (PAL), we have designed, constructed, and tested …
View article: Mechanical design of a UHV non-magnetic kappa diffractometer
Mechanical design of a UHV non-magnetic kappa diffractometer Open
A UHV non-magnetic kappa geometry diffractometer has been designed for the resonant soft X-ray scattering (RSXS) branch of the Intermediate Energy X-ray (IEX) beamline at the Advanced Photon Source (APS), Argonne National Laboratory. The k…
View article: Effect of Heat Load on Cryo-Cooled Monochromators at the European X-Ray Free-Electron Laser: Simulations and First Experimental Observations
Effect of Heat Load on Cryo-Cooled Monochromators at the European X-Ray Free-Electron Laser: Simulations and First Experimental Observations Open
European XFEL (EuXFEL) generates high-intensity ultra-short pulses at MHz repetition rate. At hard X-ray instruments, cryo-cooled silicon monochromators are used to reduce pulse bandwidth. Here, first experimental observations during commi…
View article: Progress of Mechanical Design of Nanopositioning Stages at the Advanced Photon Source
Progress of Mechanical Design of Nanopositioning Stages at the Advanced Photon Source Open
Here, we present the upgraded Advanced Photon Source (APS) will be optimized to produce hard X-rays with a high degree of spatial coherence, and will exceed the capabilities of today's synchrotrons by two to three orders of magnitude in br…
View article: High Bragg reflectivity of diamond crystals exposed to multi-kW mm<sup>−2</sup> X-ray beams
High Bragg reflectivity of diamond crystals exposed to multi-kW mm<sup>−2</sup> X-ray beams Open
X-ray free-electron lasers in the oscillator configuration (XFELO) are future fully coherent hard X-rays sources with ultrahigh spectral purity. X-ray beams circulate in an XFELO optical cavity comprising diamond single crystals. They func…
View article: Finite Element Based Optimization of Human Fingertip Optical Elastography
Finite Element Based Optimization of Human Fingertip Optical Elastography Open
Dynamic elastography methods attempt to quantitatively map soft tissue viscoelastic properties. Application to the fingertip, relevant to medical diagnostics and to improving tactile interfaces, is a novel and challenging application, give…
View article: FE Model of a Nanopositioning Flexure Stage for Diagnosis of Trajectory Errors
FE Model of a Nanopositioning Flexure Stage for Diagnosis of Trajectory Errors Open
The Advanced Photon Source Upgrade project includes upgrading several beamlines, which desire nanopositioning and fly-scan capabilities. A step towards achieving this is through the use of flexure stages with minimal trajectory errors. Typ…
View article: Mechanical Design of a New Precision Alignment Apparatus for Compact X-ray Compound Refractive Lens Manipulator
Mechanical Design of a New Precision Alignment Apparatus for Compact X-ray Compound Refractive Lens Manipulator Open
A prototype of compact x-ray compound refractive lens (CRL) manipulator system has been developed at the Argonne National Laboratory for dark-field imaging of multi-scale structures. This novel full-field imaging modality uses Bragg peaks …
View article: Mechanical Conversion of a Vertically Reflecting Artificial Channel-cut Monochromator to Horizontally Reflecting
Mechanical Conversion of a Vertically Reflecting Artificial Channel-cut Monochromator to Horizontally Reflecting Open
The mechanical conversion of a high-resolution artificial channel-cut monochromator (ACCM) from a vertically reflecting orientation to a horizontally reflecting orientation is presented. The ACCM was originally commissioned for the 8-ID-I …
View article: Simultaneous 3D MR elastography of the<i>in vivo</i>mouse brain
Simultaneous 3D MR elastography of the<i>in vivo</i>mouse brain Open
The feasibility of sample interval modulation (SLIM) magnetic resonance elastography (MRE) for the in vivo mouse brain is assessed, and an alternative SLIM-MRE encoding method is introduced. In SLIM-MRE, the phase accumulation for each mot…
View article: The Design of a Precision Mechanical Assembly for a Hard X-ray Polarizer
The Design of a Precision Mechanical Assembly for a Hard X-ray Polarizer Open
Hard x-ray polarisers are commonly applied in synchrotron radiation research to produce photons in a pure polarization state, and as polarization filters to analyse the photon’s polarization state after their interaction with a sample medi…
View article: Mechanical Design of Compact Vertical and Horizontal Linear Nanopositioning Flexure Stages With Centimeter-Level Travel Range for X-Ray Beamline Instrumentation
Mechanical Design of Compact Vertical and Horizontal Linear Nanopositioning Flexure Stages With Centimeter-Level Travel Range for X-Ray Beamline Instrumentation Open
Nanopositioning techniques present an important capability to support the state-of-the-art x-ray instrumentation research for the APS operations and upgrade project. To overcome the performance limitations of precision ball-bearing-based o…
View article: Mechanical Design and Development of Compact Linear Nanopositioning Flexure Stages with Centimeter-Level Travel Range and Nanometer-Level Resolution
Mechanical Design and Development of Compact Linear Nanopositioning Flexure Stages with Centimeter-Level Travel Range and Nanometer-Level Resolution Open
Nanopositioning techniques present an important capability to support the state-of-the-art synchrotron radiation instrumentation research for the APS operations and upgrade project. To overcome the performance limitations of precision ball…
View article: Concurrent <scp>3D</scp> acquisition of diffusion tensor imaging and magnetic resonance elastography displacement data (<scp>DTI‐MRE</scp>): Theory and in vivo application
Concurrent <span>3D</span> acquisition of diffusion tensor imaging and magnetic resonance elastography displacement data (<span>DTI‐MRE</span>): Theory and in vivo application Open
Purpose To introduce a newly developed technique (DTI‐MRE) for the simultaneous acquisition of diffusion tensor imaging (DTI) and 3D‐vector field magnetic resonance elastography (MRE) data, and to demonstrate its feasibility when applied i…
View article: A Survey of Floor Vibration Noise at All Sectors in the APS Experiment Hall
A Survey of Floor Vibration Noise at All Sectors in the APS Experiment Hall Open
A vibration survey of the APS experiment hall floor was conducted. It was found that beamlines 10-20 have particularly low levels of vibration when compared to the rest of the facility. The vibration spectrum for each beamline floor can be…
View article: Dynamic viscoelastic models of human skin using optical elastography
Dynamic viscoelastic models of human skin using optical elastography Open
A novel technique for measuring in vivo human skin viscoelastic properties using optical elastography has been developed. The technique uses geometrically focused surface (GFS) waves that allow for wide bandwidth measurements of the wave f…