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
spectrum_file		File from which to read the spectral intensity profile	NULL
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		Set phase to something given.	0
randomphase		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

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

McXtrace - An X-ray ray-trace simulation package

The Source_pt Component

Identification

Description

Input parameters

Links

The `Source_pt` Component