scholarly journals Partially coherent wavefront propagation simulations: Mirror and monochromator crystal quality assessment

2016 ◽  
Author(s):  
L. Wiegart ◽  
A. Fluerasu ◽  
D. Bruhwiler ◽  
O. Chubar
Keyword(s):  
Quality Assessment ◽  
Crystal Quality ◽  
Partially Coherent ◽  
Wavefront Propagation ◽  
Monochromator Crystal

scholarly journals Parallel simulations of partially coherent wavefront propagation from a finite emittance electron beam

2013 ◽  
Vol 425 (16) ◽  
pp. 162002 ◽  
Author(s):  
D Laundy ◽  
J P Sutter ◽  
U H Wagner ◽  
C Rau ◽  
C A Thomas ◽  
...  
Keyword(s):  
Electron Beam ◽  
Parallel Simulations ◽  
Partially Coherent ◽  
Wavefront Propagation

Performance Optimization for Hard X-ray Microscopy Beamlines Guided by Partially-Coherent Wavefront Propagation Calculations

2010 ◽  
Author(s):  
Oleg Chubar ◽  
Yong S. Chu ◽  
Konstantine Kaznatcheev ◽  
Hanfei Yan ◽  
R. Garrett ◽  
...  
Keyword(s):  
Performance Optimization ◽  
X Ray ◽  
Partially Coherent ◽  
Wavefront Propagation

Partially coherent X-ray wavefront propagation simulations including grazing-incidence focusing optics

2014 ◽  
Vol 21 (5) ◽  
pp. 1110-1121 ◽  
Author(s):  
Niccolo Canestrari ◽  
Oleg Chubar ◽  
Ruben Reininger
Keyword(s):  
Synchrotron Radiation ◽  
National Laboratory ◽  
Grazing Incidence ◽  
Brookhaven National Laboratory ◽  
Wave Optics ◽  
X Rays ◽  
X Ray ◽  
Partially Coherent ◽  
Wavefront Propagation ◽  
Simulation Results

X-ray beamlines in modern synchrotron radiation sources make extensive use of grazing-incidence reflective optics, in particular Kirkpatrick–Baez elliptical mirror systems. These systems can focus the incoming X-rays down to nanometer-scale spot sizes while maintaining relatively large acceptance apertures and high flux in the focused radiation spots. In low-emittance storage rings and in free-electron lasers such systems are used with partially or even nearly fully coherent X-ray beams and often target diffraction-limited resolution. Therefore, their accurate simulation and modeling has to be performed within the framework of wave optics. Here the implementation and benchmarking of a wave-optics method for the simulation of grazing-incidence mirrors based on the local stationary-phase approximation or, in other words, the local propagation of the radiation electric field along geometrical rays, is described. The proposed method is CPU-efficient and fully compatible with the numerical methods of Fourier optics. It has been implemented in theSynchrotron Radiation Workshop(SRW) computer code and extensively tested against the geometrical ray-tracing codeSHADOW. The test simulations have been performed for cases without and with diffraction at mirror apertures, including cases where the grazing-incidence mirrors can be hardly approximated by ideal lenses. Good agreement between theSRWandSHADOWsimulation results is observed in the cases without diffraction. The differences between the simulation results obtained by the two codes in diffraction-dominated cases for illumination with fully or partially coherent radiation are analyzed and interpreted. The application of the new method for the simulation of wavefront propagation through a high-resolution X-ray microspectroscopy beamline at the National Synchrotron Light Source II (Brookhaven National Laboratory, USA) is demonstrated.

Amalgam marginal quality assessment: a comparison of seven methods

1997 ◽  
Vol 24 (7) ◽  
pp. 496-505 ◽  
Author(s):  
E. S. GROSSMAN ◽  
J. M. MATEJKA
Keyword(s):  
Quality Assessment

Are Psychologists Ready for Quality Assessment?

PsycCRITIQUES ◽  
2006 ◽  
Vol 51 (14) ◽  
Author(s):  
Howard N. Garb
Keyword(s):  
Quality Assessment
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