The future of high angular resolution x-ray astronomy

2008 ◽  
Author(s):  
Paul Gorenstein ◽  
Webster Cash ◽  
Neil Gehrels ◽  
Keith Gendreau ◽  
John Krizmanic ◽  
...  
Keyword(s):  
Angular Resolution ◽  
High Angular Resolution ◽  
X Ray ◽  
The Future

Development of thin-shell adaptive optics for high angular resolution x-ray telescopes

2008 ◽  
Author(s):  
Charlotte Feldman ◽  
Richard Willingale ◽  
Carolyn Atkins ◽  
Hongchang Wang ◽  
Peter Doel ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Thin Shell ◽  
Angular Resolution ◽  
High Angular Resolution ◽  
X Ray

scholarly journals Next generation astronomical x-ray optics: high angular resolution, light weight, and low production cost

2012 ◽  
Author(s):  
W. W. Zhang ◽  
M. P. Biskach ◽  
P. N. Blake ◽  
K.-W. Chan ◽  
J. A. Gaskin ◽  
...  
Keyword(s):  
Production Cost ◽  
Angular Resolution ◽  
High Angular Resolution ◽  
Light Weight ◽  
Next Generation ◽  
Ray Optics ◽  
X Ray

Fused silica segments: a possible solution for x-ray telescopes with very high angular resolution like Lynx/XRS

2017 ◽  
Author(s):  
Bianca Salmaso ◽  
Stefano Basso ◽  
Marta M. Civitani ◽  
Mauro Ghigo ◽  
Joanna Holyszko ◽  
...  
Keyword(s):  
Angular Resolution ◽  
Fused Silica ◽  
High Angular Resolution ◽  
X Ray ◽  
Very High

Harecxs Measurements of Elemental Disordering

2001 ◽  
Vol 7 (S2) ◽  
pp. 354-355
Author(s):  
Nestor J. Zaluzec ◽  
Katherine L. Smith
Keyword(s):  
Angular Resolution ◽  
Alpha Decay ◽  
High Angular Resolution ◽  
Crystalline Materials ◽  
X Ray ◽  
Geologic Time ◽  
The Past ◽  
Selected Area Electron Diffraction ◽  
Resolution Electron ◽  
High Level

It has been long known that orientation effects in crystalline materials can influence characteristic x-ray emission and microanalysis1-7. High Angular Resolution Electron Channeling X-ray Spectroscopy (HARECXS)6-7. a variation of ALCHEMI4-5, has been used at ANL for the last few years to investigate the effects of channeling on quantitative XEDS analysis of materials. More recently we have also been using HARECXS to carefully measure elemental disordering in a number of systems and have found that it can be used very successfully to elucidate the various stages of disorder.Perovskite (nominally CaTiO3) is a host phase for actinides in various wasteforms for the immobilization of high level radioactive nuclear waste. Over geologic time, alpha decay damage of the actinides in perovskite will cause displacive effects that influence the dimensional and chemical stability of the wasteform. in the past, the progression of damage has been studied by monitoring changes in selected area electron diffraction (SAED) patterns with increasing dose (e.g. 11).

Electron Channeling X-ray Microanalysis for Cation Configuration in Irradiated Magnesium Aluminate Spinel

1999 ◽  
Vol 589 ◽  
Author(s):  
S. Matsumura ◽  
T. Soeda ◽  
N. J. Zaluzec ◽  
C. Kinoshita
Keyword(s):  
Angular Resolution ◽  
Magnesium Aluminate ◽  
High Angular Resolution ◽  
X Rays ◽  
Magnesium Aluminate Spinel ◽  
X Ray ◽  
Electron Channeling ◽  
Resolution Electron ◽  
Practical Tool ◽  
Cation Arrangement

AbstractHigh angular resolution electron channeling x-ray spectroscopy (HARECXS) was examined as a practical tool to locate lattice-ions in spinel crystals. The orientation dependent intensity distribution of emitted x-rays obtained by HARECXS is so sensitive to lattice-ion configuration in the illuminated areas that the occupation probabilities on specific positions in the crystal lattice can be determined accurately through comparison with the theoretical rocking curves. HARECXS measurements have revealed partially disordered cation arrangement in MgO·nAl2O3 with n= 1.0 and 2.4. Most A13+ lattice-ions occupy the octahedral (VI) sites with 6-fold coordination, while Mg2+ lattice-ions reside on both the tetrahedral (IV) and the octahedral (VI) sites. The structural vacancies are enriched in the IV-sites. Further evacuation of cations from the IV-sites to the VI-sites is recognized in a disordering process induced by irradiation with 1 MeV Ne+ ions up to 8.9 dpa at 870 K.

scholarly journals ALMA and the Future of Millimeter Imaging Observations

2015 ◽  
Vol 10 (S314) ◽  
pp. 270-275
Author(s):  
David J. Wilner
Keyword(s):  
Angular Resolution ◽  
Planetary Systems ◽  
Circumstellar Disks ◽  
Direct Access ◽  
High Angular Resolution ◽  
Dynamical Structure ◽  
Millimeter Wavelengths ◽  
The Future ◽  
Critical Age ◽  
Moving Groups

AbstractThe Nearby Young Moving Groups sample the critical age when primordial disks around stars complete their transformation into planetary systems with associated debris. Millimeter wavelengths provide direct access to cool material in these circumstellar disks. The high angular resolution of interferometry at these long wavelengths enables resolved observations of solids in an optically thin regime, as well as the thermal, chemical, and dynamical structure of gas, if present. In this contribution, I briefly review the evolving landscape of millimeter telescopes, with emphasis on the revolutionary capabilities of the new international Atacama Large Millimeter/submillimeter Array (ALMA) and describe pertinent early science results.

The Huber G670 imaging-plate Guinier camera tested on beamline I711 at the MAX II synchrotron

2000 ◽  
Vol 33 (2) ◽  
pp. 394-396 ◽  
Author(s):  
Kenny Ståhl
Keyword(s):  
Angular Resolution ◽  
High Angular Resolution ◽  
Imaging Plate ◽  
Correction Factors ◽  
Synchrotron Source ◽  
X Ray ◽  
Synchrotron Beam ◽  
Unusual Combination ◽  
Low Symmetry ◽  
Collection Time

A Huber G670 imaging-plate Guinier powder diffraction camera has been tested at an X-ray synchrotron source. It was found to be a very potent tool, offering an unusual combination of high angular resolution and short data collection time, while using very small amounts of sample. Specifically, it was found that: (i) the angular resolution (full width at half-maximum) varies between 0.07 and 0.15° in 2θ without focusing,i.e.relying on a parallel synchrotron beam; (ii) with a readout and erasure cycle time of 15 s, it is possible to obtain Rietveld-refinable data within less than a minute for a low-symmetry zeolite refined with 82 parameters; (iii) special attention has to be given to calibration of the detector and some general geometrical correction factors should be included in the data reduction.

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