McXtrace - An X-ray ray-trace simulation package

[ Identification | Description | Input parameters | Links ]

The Source_lab Component

Laboratory x-ray source.

Identification

• Site:
• Author: Erik Bergbaeck Knudsen
• Origin: Kgs. Lyngby
• Date: May 2012

Description

Model of a laboratory x-ray tube, generating x-rays by bombarding a target by electrons.
Given a input energy E0 of the electron beam, x-rays are emitted from the accessible emission lines
The geometry of the tube is assumed to be:
# The electron beam hits a slab of surface material surface at a right angle illuminating an area of width by height,
# where width is measured along the component X-axis.
# The centre of the electron beam at the anode surface is the origin of the component.
# The Z-axis of the component points at the centre of the exit window (focus_xw by focus yh)
placed at a distance dist from the origin.
# The angle between the Z-axis and the anode surface is the take_off angle.
For a detailed sketch of the geometry see the componnent manual.

The Bremsstrahlung emitted is modelled using the model of Kramer (1923) as restated in International
Tables of Crystallography C 4.1
Characteristic radiation is modelled by Lorentzian (default) or Gaussian energy profiles with
line-energies from Bearden (1967), widths from Krause (1979) and intensity from Honkimäki (1990) and x-ray data booklet.
Absoprtion of emitted x-rays while travelling through the target anode is included.

Example: Source_lab(material_datafile="Cu.txt",Emin=1, E0=80)

Input parameters

Parameters in boldface are required; the others are optional.

Name	Unit	Description	Default
material_datafile		Name of datafile which describes the target material.	"Cu.txt"
width	m	Width of electron beam impinging on the anode.	1e-3
height	m	Height of electron beam impinging on the anode.	1e-3
thickness	m	Thickness of the anode material slab.	100e-6
E0	kV	Acceleration voltage of xray tube.	20
Emax	keV	Maximum energy to sample. Default (Emax=0) is to set it to E0.	0
Emin	keV	Minimum energy to sample.	1
focus_xw	m	Width of exit window.	5e-3
focus_yh	m	Height of exit window.	5e-3
take_off	deg	Take off angle of beam centre.	6
dist	m	Distance between centre of illuminated target and exit window.	1
tube_current	A	Electron beam current.	1e-3
frac		Fraction of statistic to use for Bremsstrahlung.	0.1
lorentzian		If nonzero Lorentzian (more correct) line profiles are used.	1
xwidth	m	Width of the anode material slab.	0
yheight	m	Height of the anode material slab.	0
exit_window_refpt	m	If set, the AT position and exit window will coincide (legacy behaviour).	0

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

Links

• Source code for Source_lab.comp.

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[ Identification | Description | Input parameters | Links ]

Generated on 2025-03-31 19:18:19

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Last Modified: Tuesday, 17-Jun-2025 20:12:03 CEST