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McXtrace - An X-ray ray-trace simulation package

ESRF; SAXSLAB Niels Bohr Institute DTU Physics

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McXtrace: Source_div Component

[ Identification | Description | Input parameters | Output parameters | Links ]

The Source_div Component

X-ray source with Gaussian or uniform divergence

Identification

  • Author: Erik Knudsen
  • Origin: Risoe
  • Date: November 11, 2009
  • Version: 1.25

Description

A flat rectangular surface source with uniform or Gaussian divergence profile and focussing.
If the parametere gauss is not set (the default) the divergence profile is flat
in the range [-focus_ax,focus_ay]. If gauss is set, the focux_ax,focus_ay is considered
the standard deviation of the gaussian profile.
Currently focussing is only active for flat profile. The "focus window" is defined by focus_xw,focus_yh and dist.
The spectral intensity profile is uniformly distributed in the energy interval defined by e0+-dE/2 or 
by wavelength lambda0+-dlambda/2

Example: Source_div(xwidth=0.1, yheight=0.1, focus_aw=2, focus_ah=2, E0=14, dE=2, gauss=0)

%VALIDATION

%BUGS

Input parameters

Parameters in boldface are required; the others are optional.
Name Unit Description Default
spectrum_file NULL
xwidth m Width of source  
yheight m Height of source  
focus_xw 0
focus_yh 0
dist 0
focus_aw rd FWHM (Gaussian) or maximal (uniform) horz. width divergence  
focus_ah rd FWHM (Gaussian) or maximal (uniform) vert. height divergence  
E0 keV Mean energy of X-rays. 0
dE keV Energy spread of X-rays. 0
lambda0 AA Mean wavelength of X-rays (only relevant for E0=0) 0
dlambda AA Wavelength half spread of X-rays. 0
flux 1/(s*cm**2*st*energy unit) flux per energy unit, Angs or meV 0
gauss 1 Criterion: 0: uniform, 1: Gaussian distribution of energy/wavelength 0
gauss_a 1 Criterion: 0: uniform, 1: Gaussian divergence distribution 0
incoherent 1
phase 0

Output parameters

Name Unit Description Default
prms  
thetah  
thetav  
sigmah rad parameter 'sigma' of the Gaussian distribution for horizontal divergence  
sigmav rad parameter 'sigma' of the Gaussian distribution for vertical divergence  
tan_h  
tan_v  
p_init - normalisation factor 1/'neutron_count'  
dist 0

Links


[ Identification | Description | Input parameters | Output parameters | Links ]

Generated automatically by McDoc, Peter Willendrup <peter.willendrup@risoe.dk> / Mon Jun 26 12:36:38 2017


Last Modified: Monday, 26-Jun-2017 14:36:38 CEST
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