scholarly journals Brilliant X-rays using a Two-Stage Plasma Insertion Device

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
J. A. Holloway ◽  
P. A. Norreys ◽  
A. G. R. Thomas ◽  
R. Bartolini ◽  
R. Bingham ◽  
...  
Keyword(s):  
X Rays ◽  
Two Stage ◽  
Insertion Device

scholarly journals Pink-beam focusing with a one-dimensional compound refractive lens

2016 ◽  
Vol 23 (5) ◽  
pp. 1082-1086 ◽  
Author(s):  
Eric M. Dufresne ◽  
Robert W. Dunford ◽  
Elliot P. Kanter ◽  
Yuan Gao ◽  
Seoksu Moon ◽  
...  
Keyword(s):  
Power Density ◽  
Imaging System ◽  
X Rays ◽  
One Dimensional ◽  
X Ray ◽  
Beam Focusing ◽  
Insertion Device ◽  
Refractive Lens ◽  
Low Density Plasma ◽  
Photon Source

The performance of a cooled Be compound refractive lens (CRL) has been tested at the Advanced Photon Source (APS) to enable vertical focusing of the pink beam and permit the X-ray beam to spatially overlap with an 80 µm-high low-density plasma that simulates astrophysical environments. Focusing the fundamental harmonics of an insertion device white beam increases the APS power density; here, a power density as high as 500 W mm−2was calculated. A CRL is chromatic so it does not efficiently focus X-rays whose energies are above the fundamental. Only the fundamental of the undulator focuses at the experiment. A two-chopper system reduces the power density on the imaging system and lens by four orders of magnitude, enabling imaging of the focal plane without any X-ray filter. A method to measure such high power density as well as the performance of the lens in focusing the pink beam is reported.

X-Rays at the SIAM Photon Source

2005 ◽  
Vol 107 ◽  
pp. 1-6 ◽  
Author(s):  
R. Apiwatwaja ◽  
S. Chunjarean ◽  
K. Hass ◽  
G. Hoyes ◽  
C. Kaewprasert ◽  
...  
Keyword(s):  
Electron Beam ◽  
Beam Energy ◽  
Photon Beam ◽  
Electron Beam Energy ◽  
X Rays ◽  
Vacuum Chambers ◽  
Wavelength Shifter ◽  
Insertion Device ◽  
Beam Instabilities ◽  
Photon Source

In this note, we describe the upgrade effort to convert the SIAM Photon source into an Xray synchrotron radiation facility with photon energies up to some 15 keV. This conversion of SIAM Photon into a third generation light source can be achieved through an increase of the electron beam energy and the addition of recently available superconducting wavelength shifter and multipole wiggler magnets. A gradual retrofit of vacuum chambers aiming at a reduction of electron beam instabilities as well as a modification of the focusing structure are expected to greatly increase the brightness of the photon beam. These upgrades will be implemented gradually over a few years to minimize the interruption of ongoing experimental activities. As an ultimate upgrade, a study has been started which shows the feasibility to implement a 2 GeV storage ring replacing the present ring in the same foot print. This new ring is configured to provide double the number of insertion device photon beam lines.

scholarly journals An Unusual Complication after Infected Total Knee Arthroplasty

Joints ◽  
2018 ◽  
Vol 06 (04) ◽  
pp. 241-245
Author(s):  
Giuseppe Solarino ◽  
Giuseppe Maccagnano ◽  
Michele Saracino ◽  
Biagio Moretti
Keyword(s):  
Total Knee Arthroplasty ◽  
Knee Arthroplasty ◽  
Short Form ◽  
Unusual Complication ◽  
Cement Spacer ◽  
X Rays ◽  
Two Stage ◽  
Hybrid External Fixator ◽  
Infected Total Knee Arthroplasty ◽  
Total Knee

AbstractOne-stage or two-stage revision total knee arthroplasty (TKA) in periprosthetic joint infections has been at the center of scientific debate for many years. As regards two-stage revision TKA, cement spacers have a good infection control rate with successful results reportable up to 96%, though some studies describe related spacer complications such as stiffness and loss of bone stock. We report a case of a fracture close to the antibiotic-loaded cement spacer in a 74-year-old female patient. Due to the blood tests and high risk of infection, we performed a hybrid external fixator. Six months after the surgery, X-rays did not show signs of fracture consolidation and nonunion was considered as an impending complication; therefore, the decision was made to perform tumor-like total knee arthroplasty. The postoperative evolution was satisfactory and return to daily activity without pain. At the 5-year follow-up, the patient showed a good score of 36-Item Short Form Health Survey and a range of motion from 0 to 90° without pain. The X-rays did not show signs of mobilization, dislocation, recurrence of infection, or other complications.

scholarly journals X-Ray Magnetic Circular Dichroism Spectroscopy and Microscopy

MRS Bulletin ◽  
1995 ◽  
Vol 20 (10) ◽  
pp. 41-44 ◽  
Author(s):  
N.V. Smith ◽  
H.A. Padmore
Keyword(s):  
Circular Dichroism ◽  
Magnetic Circular Dichroism ◽  
X Rays ◽  
Circularly Polarized ◽  
X Ray ◽  
Insertion Device ◽  
Magnetic Circular Dichroism Spectroscopy ◽  
Out Of Plane ◽  
X Ray Absorption ◽  
Circular Dichroïsm

The advent of electron accelerators dedicated to the production of high-intensity x-rays has revitalized experimental techniques based on x-ray absorption. A recent variant is to use circularly polarized x-rays generated either by use of out-of-plane radiation from a bending magnet or from a specially designed “insertion device.” This new field of x-ray magnetic circular dichroism (XMCD) shows considerable promise in spectroscopy and microscopy of magnetic materials. In this article, we describe the nature of XMCD, offer a few examples of recent progress, and review the prospects for future development using the newly constructed Advanced Light Source (ALS).

In-vacuum figure-8 undulator for hard X-rays with both horizontal and vertical polarization

1998 ◽  
Vol 5 (3) ◽  
pp. 412-413 ◽  
Author(s):  
Takashi Tanaka ◽  
Xavier-Marie Maréchal ◽  
Toru Hara ◽  
Toshiya Tanabe ◽  
Hideo Kitamura
Keyword(s):  
X Rays ◽  
Horizontal Polarization ◽  
Vertical Polarization ◽  
Insertion Device ◽  
Fundamental Radiation

A figure-8 undulator of the in-vacuum type has been adopted as an insertion device for BL24XU, the Hyogo Beamline at SPring-8, to provide hard X-rays with both horizontal and vertical polarization instead of a tandem undulator consisting of horizontal and vertical undulators. The undulator will be operated with the gap almost fixed at 11.6 mm to provide the fundamental radiation with horizontal polarization at 9.5 keV and the 1.5th harmonic with vertical polarization at 14 keV.

scholarly journals A Hybrid Two-Stage GNG -Modified VGG Method for Bone X-rays Classification and Abnormality Detection

IEEE Access ◽  
2021 ◽  
pp. 1-1
Author(s):  
Hadeer El-Saadawy ◽  
Manal Tantawi ◽  
Howida A. Shedeed ◽  
Mohamed F. Tolba
Keyword(s):  
X Rays ◽  
Abnormality Detection ◽  
Two Stage

scholarly journals XTIP – the world's first beamline dedicated to the synchrotron X-ray scanning tunneling microscopy technique

2020 ◽  
Vol 27 (3) ◽  
pp. 836-843 ◽  
Author(s):  
Volker Rose ◽  
Nozomi Shirato ◽  
Michael Bartlein ◽  
Alex Deriy ◽  
Tolulope Ajayi ◽  
...  
Keyword(s):  
Scanning Tunneling Microscopy ◽  
National Laboratory ◽  
Argonne National Laboratory ◽  
Scanning Tunneling ◽  
X Rays ◽  
Tunneling Microscopy ◽  
X Ray ◽  
Microscopy Technique ◽  
Insertion Device ◽  
Photon Source

In recent years, there have been numerous efforts worldwide to develop the synchrotron X-ray scanning tunneling microscopy (SX-STM) technique. Here, the inauguration of XTIP, the world's first beamline fully dedicated to SX-STM, is reported. The XTIP beamline is located at Sector 4 of the Advanced Photon Source at Argonne National Laboratory. It features an insertion device that can provide left- or right-circular as well as horizontal- and vertical-linear polarization. XTIP delivers monochromatic soft X-rays of between 400 and 1900 eV focused into an environmental enclosure that houses the endstation instrument. This article discusses the beamline system design and its performance.

scholarly journals Two-stage Lateral Maxillary Sinus Lift using Autogenous Bone and β-Tricalcium Phosphate: Clinical and Histomorphometric Evaluation

2020 ◽  
Vol 5 (1) ◽  
pp. 96-100
Author(s):  
Radek Mounajjed
Keyword(s):  
Success Rate ◽  
Tricalcium Phosphate ◽  
Autogenous Bone ◽  
X Rays ◽  
Sinus Lift ◽  
Marginal Bone Loss ◽  
Two Stage ◽  
Implant Placement ◽  
Bone Harvesting ◽  
Autologous Bone

Background: To assess the clinical and histomorphometric data of the new bone tissue from a mixture of autologous bone and β-tricalcium phosphate. Materials and methods: A total of 72 two-stage sinus lift were performed in 54 patients during 2007 to 2010. The autologous bone was harvested from the mandibular ramus and mixed with the β-tricalcium phosphate Poresorb® TCP sized 1-2 mm. The materials were used in a proportion ranged between 1:1 and 1:3. After the healing period a total of 119 implants were placed and 10 samples of the regenerated bone were collected for the histomorphometric analysis. CBCT or panoramic X-rays were performed presurgically, before the implant placement, six months after implant placement and then yearly to evaluate the bone formation and marginal bone loss. The implant success rate was determined using the Albrektsson et al. Criteria. Results: The mean of the residual bone was 4.07 mm ± 1.87 mm. The bone gain in the sinus was 11.91 mm ± 2.80 mm. The implant success rate was 94.95%. The histomorphometric measurements on the biopsies showed a bone area mean of 39.7 ± 9.71%. The residual allograft area was 16.21 ± 8.78%. The connective tissue was 44.16 ± 5.85%. Conclusion: Within the limit of this study, the osteoconductive β-tricalcium phosphate associated with autologous bone is a viable grafting material for sinus lift procedures. The use of composite grafts can help to reduce the morbidity and aggressivity of the bone harvesting. Keywords: Sinus lift; Bone regeneration; Dental implants; β-tricalcium phosphate; Bone graft; Bone atrophy

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