scholarly journals Automatic alignment and reconstruction of images for soft X-ray tomography

2012 ◽  
Vol 177 (2) ◽  
pp. 259-266 ◽  
Author(s):  
Dilworth Y. Parkinson ◽  
Christian Knoechel ◽  
Chao Yang ◽  
Carolyn A. Larabell ◽  
Mark A. Le Gros
Keyword(s):  
X Ray ◽  
Automatic Alignment

Automatic alignment of a Kirkpatrick-Baez active optic by use of a soft-x-ray Hartmann wavefront sensor

2006 ◽  
Vol 31 (2) ◽  
pp. 199 ◽  
Author(s):  
Pascal Mercère ◽  
Mourad Idir ◽  
Thierry Moreno ◽  
Gilles Cauchon ◽  
Guillaume Dovillaire ◽  
...  
Keyword(s):  
Wavefront Sensor ◽  
X Ray ◽  
Automatic Alignment

Confocal depth-resolved fluorescence micro-X-ray absorption spectroscopy for the study of cultural heritage materials: a new mobile endstation at the Beijing Synchrotron Radiation Facility

2017 ◽  
Vol 24 (5) ◽  
pp. 1000-1005 ◽  
Author(s):  
Guang Chen ◽  
Shengqi Chu ◽  
Tianxi Sun ◽  
Xuepeng Sun ◽  
Lirong Zheng ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Absorption Spectroscopy ◽  
Incident Beam ◽  
Sample Volume ◽  
X Ray ◽  
Alignment Procedure ◽  
Beijing Synchrotron Radiation Facility ◽  
Automatic Alignment ◽  
Confocal Fluorescence ◽  
X Ray Absorption

A confocal fluorescence endstation for depth-resolved micro-X-ray absorption spectroscopy is described. A polycapillary half-lens defines the incident beam path and a second polycapillary half-lens at 90° defines the probe sample volume. An automatic alignment program based on an evolutionary algorithm is employed to make the alignment procedure efficient. This depth-resolved system was examined on a general X-ray absorption spectroscopy (XAS) beamline at the Beijing Synchrotron Radiation Facility. Sacrificial red glaze (AD 1368–1644) china was studied to show the capability of the instrument. As a mobile endstation to be applied on multiple beamlines, the confocal system can improve the function and flexibility of general XAS beamlines, and extend their capabilities to a wider user community.

scholarly journals EUV and Hard X-ray Hartmann Wavefront Sensing for Optical Metrology, Alignment and Phase Imaging

Sensors ◽  
2021 ◽  
Vol 21 (3) ◽  
pp. 874
Author(s):  
Ombeline de La Rochefoucauld ◽  
Guillaume Dovillaire ◽  
Fabrice Harms ◽  
Mourad Idir ◽  
Lei Huang ◽  
...  
Keyword(s):  
High Performance ◽  
High Harmonic ◽  
Ultra Violet ◽  
Phase Imaging ◽  
Wavefront Sensors ◽  
X Ray ◽  
X Ray Imaging ◽  
Wide Range ◽  
Automatic Alignment ◽  
Euv Lasers

For more than 15 years, Imagine Optic have developed Extreme Ultra Violet (EUV) and X-ray Hartmann wavefront sensors for metrology and imaging applications. These sensors are compatible with a wide range of X-ray sources: from synchrotrons, Free Electron Lasers, laser-driven betatron and plasma-based EUV lasers to High Harmonic Generation. In this paper, we first describe the principle of a Hartmann sensor and give some key parameters to design a high-performance sensor. We also present different applications from metrology (for manual or automatic alignment of optics), to soft X-ray source optimization and X-ray imaging.

Automatic Alignment Technique For X-Ray Lithography Using Moire Signals In Reflection

1986 ◽  
Author(s):  
Yoshiyuki Uchida ◽  
Masato Furukawa ◽  
Kazuhiro Hane ◽  
Shuzo Hattori
Keyword(s):  
X Ray ◽  
Automatic Alignment ◽  
Alignment Technique

scholarly journals Automatic Alignment of X-Ray Beams

2003 ◽  
Author(s):  
Zachary R Anderson
Keyword(s):  
X Ray ◽  
Automatic Alignment

Space and Time Distribution of Hard X-Ray Emission in a Loop at the Beginning of a Flare

1994 ◽  
Vol 144 ◽  
pp. 275-277
Author(s):  
M. Karlický ◽  
J. C. Hénoux
Keyword(s):  
Time Distribution ◽  
Electron Bombardment ◽  
Spatial Evolution ◽  
Superthermal Electrons ◽  
Flare Loop ◽  
X Ray ◽  
Superthermal Electron ◽  
Flare Loops ◽  
Chromospheric Evaporation ◽  
Temporal And Spatial

AbstractUsing a new ID hybrid model of the electron bombardment in flare loops, we study not only the evolution of densities, plasma velocities and temperatures in the loop, but also the temporal and spatial evolution of hard X-ray emission. In the present paper a continuous bombardment by electrons isotropically accelerated at the top of flare loop with a power-law injection distribution function is considered. The computations include the effects of the return-current that reduces significantly the depth of the chromospheric layer which is evaporated. The present modelling is made with superthermal electron parameters corresponding to the classical resistivity regime for an input energy flux of superthermal electrons of 109erg cm−2s−1. It was found that due to the electron bombardment the two chromospheric evaporation waves are generated at both feet of the loop and they propagate up to the top, where they collide and cause temporary density and hard X-ray enhancements.

Some Problems in Understanding the Solar Corona

1994 ◽  
Vol 144 ◽  
pp. 1-9
Author(s):  
A. H. Gabriel
Keyword(s):  
Solar Corona ◽  
Solar Atmosphere ◽  
Theoretical Modelling ◽  
Total System ◽  
Major Advance ◽  
X Ray ◽  
Proper Perspective ◽  
Space Observations

The development of the physics of the solar atmosphere during the last 50 years has been greatly influenced by the increasing capability of observations made from space. Access to images and spectra of the hotter plasma in the UV, XUV and X-ray regions provided a major advance over the few coronal forbidden lines seen in the visible and enabled the cooler chromospheric and photospheric plasma to be seen in its proper perspective, as part of a total system. In this way space observations have stimulated new and important advances, not only in space but also in ground-based observations and theoretical modelling, so that today we find a well-balanced harmony between the three techniques.

White-Light Coronal Structures: Streamers and CMEs

1994 ◽  
Vol 144 ◽  
pp. 82
Author(s):  
E. Hildner
Keyword(s):  
Emission Line ◽  
Electron Density ◽  
White Light ◽  
Coronal Mass Ejections ◽  
X Rays ◽  
Solar Cycles ◽  
Temperature Function ◽  
X Ray ◽  
Eclipse Observations ◽  
Coronal Structures

AbstractOver the last twenty years, orbiting coronagraphs have vastly increased the amount of observational material for the whitelight corona. Spanning almost two solar cycles, and augmented by ground-based K-coronameter, emission-line, and eclipse observations, these data allow us to assess,inter alia: the typical and atypical behavior of the corona; how the corona evolves on time scales from minutes to a decade; and (in some respects) the relation between photospheric, coronal, and interplanetary features. This talk will review recent results on these three topics. A remark or two will attempt to relate the whitelight corona between 1.5 and 6 R⊙to the corona seen at lower altitudes in soft X-rays (e.g., with Yohkoh). The whitelight emission depends only on integrated electron density independent of temperature, whereas the soft X-ray emission depends upon the integral of electron density squared times a temperature function. The properties of coronal mass ejections (CMEs) will be reviewed briefly and their relationships to other solar and interplanetary phenomena will be noted.

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