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
Example: Source_div(xwidth=0.1, yheight=0.1, focus_aw=2, focus_ah=2, E0=14, dE=2, gauss=0)
Parameters in boldface are required;
the others are optional.
Width of source.
Height of source.
Standard deviation (Gaussian) or maximal (uniform) horz. width divergence.
Standard deviation (Gaussian) or maximal (uniform) vert. height divergence.
Mean energy of X-rays.
Energy half spread of X-rays. If gauss==0 dE is the half-spread, i.e. E\in[E0-dE,E0+dE], if gauss!=0 it's interpreted as the standard dev.
Mean wavelength of X-rays (only relevant for E0=0).
Wavelength half spread of X-rays.
1/(s * mm**2 *mrad**2 * energy unit
) flux per energy unit, Angs or keV.
Criterion: 0: uniform, 1: Gaussian distribution of energy/wavelength.