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

The Source_lab Component

Laboratory x-ray source.

Identification

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.

The reference point of the component is the centre of the electron beam hitting the anode, with the optical'axis pointing towards
the centre of the exit window (focus_xw,focus_yh). Users preferring the legacy behaviour with the reference point in the exit window,
may set the parameter exit_window_refpt.

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

Input parameters

Parameters in boldface are required; the others are optional.
NameUnitDescriptionDefault
material_datafile Name of datafile which describes the target material."Cu.txt"
widthmWidth of electron beam impinging on the anode.1e-3
heightmHeight of electron beam impinging on the anode.1e-3
thicknessmThickness of the anode material slab.100e-6
E0kVAcceleration voltage of xray tube.20
EmaxkeVMaximum energy to sample. Default (Emax=0) is to set it to E0.0
EminkeVMinimum energy to sample.1
focus_xwmWidth of exit window.5e-3
focus_yhmHeight of exit window.5e-3
take_offdegTake off angle of beam centre.6
distmDistance between centre of illuminated target and exit window.1
tube_currentAElectron 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
xwidth0
yheight0
exit_window_refpt If non-zero the reference point is the exit window centre.0

Output parameters

Parameters in boldface are required; the others are optional.
NameUnitDescriptionDefault
R_xray_gen
R_xray_geni
O_xray_gen
prms
pmul_c
mu
p_continous

Links


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

Generated on 2021-08-13 08:57:53