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[ Identification | Description | Input parameters | Links ]
The Source_pt Component
An x-ray point source
Identification
- Site:
- Author: Erik Knudsen
- Origin: Risoe
- Date: June 29th, 2009
Description
A simple source model emitting photons from a point source uniformly into 4pi. A square target centered on the Z-axis restricts the beam to that aperture. If an input spectrum datafile (spectrum_file) is not specified, the beam is restricted to emit photons between E0+-dE keV, or lambda0+-dlambda AA, whichever is given. The input spectrum file should be formatted such that x-ray energy/wavelength is in the first column and the intensity in the second. Any preceding lines starting with # are considered part of the file header. If a datafile is given, a nonzero E¤0 value indicates that is is parametrized by energy ( in keV) as opposed to wavelength (in AA). Wavelength is the default. Flux is given in the unit photons/s Example: Source_pt(dist=1,focus_xw=0.1,focus_yh=0.1, lamda=0.231, dlambda=0.002)
Input parameters
Parameters in boldface are required; the others are optional.| Name | Unit | Description | Default | |
| focus_xw | m | Width of target | 0 | |
| focus_yh | m | Height of target | 0 | |
| focus_x0 | m | x-cocordinate of target centre. | 0 | |
| focus_y0 | m | y-coordinate of target centre. | 0 | |
| flux | ph/s | Total flux radiated from the source. | 0 | |
| dist | m | Distance from source plane to sampling window. | 1 | |
| E0 | keV | Mean energy of xrays. | 0 | |
| dE | keV | Energy half spread of x-rays. | 0 | |
| lambda0 | AA | Mean wavelength of x-rays. | 0 | |
| dlambda | AA | Wavelength half spread of x-rays (flat or gaussian sigma). | 0 | |
| phase | rad | Set phase to something given. | 0 | |
| randomphase | 0/1 | If nonzero, the phase of the emotted photon is random, i.e. source is fully incoherent. otherwise the value of phase is used. | 1 | |
| gauss | 1 | Gaussian (1) or Flat (0) energy/wavelength distribution | 0 | |
| spectrum_file | string | File from which to read an input spectrum. | "" | |
| verbose | 1 | Output more information runtime. | 0 |
| AT ( | , | , | ) RELATIVE | |||
|---|---|---|---|---|---|---|
| ROTATED ( | , | , | ) RELATIVE |
Links
- Source code for
Source_pt.comp.
[ Identification | Description | Input parameters | Links ]
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