McXtrace - An X-ray ray-trace simulation package

[ Identification | Description | Input parameters | Links ]

The Source_div_quasi Component

Quasi-stochastic X-ray source with Gaussian or uniform divergence

Identification

• Site:
• Author: Mads Carlsen and Erik Bergbäck Knudsen (erkn@fysik.dtu.dk)
• Origin: DTU Physics
• Date: Apr 21

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

The phase space sapnned by the generated X-rays is sampled by means of Halton-sequences, instead of regular
pseudo random numbers. This ensures that samples are evenly distributed within the phase space region of interest.

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

Input parameters

Parameters in boldface are required; the others are optional.

Name	Unit	Description	Default
spectrum_file	string	File from which to read the spectral intensity profile	""
xwidth	m	Width of source	0
yheight	m	Height of source	0
focus_xw	m	Width of sampling window	0
focus_yh	m	Height of sampling window	0
dist	m	Downstream distance to place sampling target window	0
focus_aw	rad	Std. dev. (Gaussian) or maximal (uniform) horz. width divergence. focus_xw overrrides if it is more restrictive.	0
focus_ah	rad	Std. dev. (Gaussian) or maximal (uniform) vert. height divergence. focus_yh overrrides if it is more restrictive.	0
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
randomphase	0/1	When=1, the X-ray phase is randomised	1
phase	rad	Set to finite value to define X-ray phase (0:2 pi)	0
verbose	0/1	Generate more output on the console.	1

AT (	,	,		) RELATIVE		Generate
ROTATED (	,	,		) RELATIVE

Links

• Source code for Source_div_quasi.comp.

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[ Identification | Description | Input parameters | Links ]

Generated on mcxtrace 3.5.27

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Last Modified: Tuesday, 29-Apr-2025 16:44:04 CEST