Refractive/diffractive telescope with very high angular resolution for X-ray astronomy

2005 ◽  
Author(s):  
P. Gorenstein ◽  
J. D. Phillips ◽  
R. D. Reasenberg
Keyword(s):  
Angular Resolution ◽  
High Angular Resolution ◽  
X Ray ◽  
Very High

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

Small-Angle Electron Scattering (SAES) of Polymers

1985 ◽  
Vol 43 ◽  
pp. 78-79
Author(s):  
Ralph Oralor ◽  
Pamela Lloyd ◽  
Satish Kumar ◽  
W. W. Adams
Keyword(s):  
Electron Scattering ◽  
Small Angle ◽  
Angular Resolution ◽  
Structural Features ◽  
Objective Lens ◽  
High Angular Resolution ◽  
Push Button ◽  
First Case ◽  
Diffraction Mode ◽  
Very High

Small angle electron scattering (SAES) has been used to study structural features of up to several thousand angstroms in polymers, as well as in metals. SAES may be done either in (a) long camera mode by switching off the objective lens current or in (b) selected area diffraction mode. In the first case very high camera lengths (up to 7Ø meters on JEOL 1Ø ØCX) and high angular resolution can be obtained, while in the second case smaller camera lengths (approximately up to 3.6 meters on JEOL 1Ø ØCX) and lower angular resolution is obtainable. We conducted our SAES studies on JEOL 1ØØCX which can be switched to either mode with a push button as a standard feature.

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

scholarly journals The circumstellar discs of Be stars

2010 ◽  
Vol 6 (S272) ◽  
pp. 325-336 ◽  
Author(s):  
Alex C. Carciofi
Keyword(s):  
Angular Resolution ◽  
Central Star ◽  
High Angular Resolution ◽  
Be Stars ◽  
Keplerian Orbit ◽  
Physical Processes ◽  
Simple Description ◽  
Model Predictions ◽  
Mass Ejection ◽  
Very High

AbstractCircumstellar discs of Be stars are thought to be formed from material ejected from a fast-spinning central star. This material possesses large amounts of angular momentum and settles in a quasi-Keplerian orbit around the star. This simple description outlines the basic issues that a successful disc theory must address: 1) What is the mechanism responsible for the mass ejection? 2) What is the final configuration of the material? 3) How the disc grows? With the very high angular resolution that can be achieved with modern interferometers operating in the optical and infrared we can now resolve the photosphere and immediate vicinity of nearby Be stars. Those observations are able to provide very stringent tests for our ideas about the physical processes operating in those objects. This paper discusses the basic hydrodynamics of viscous decretion discs around Be stars. The model predictions are quantitatively compared to observations, demonstrating that the viscous decretion scenario is currently the most viable theory to explain the discs around Be stars.

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).

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