[ Identification | Description | Input parameters | Links ]
Source_div_quasi ComponentA 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 The phase space spanned by the generated neutrons is sampled by means of Halton-sequences, instead of regular pseudo random numbers. This ensures that samples are evenly distributed within the phase space region of interest. Example: Source_div_quasi(xwidth=0.1, yheight=0.1, focus_aw=2, focus_ah=2, E0=14, dE=2, gauss=0) %VALIDATION %BUGS
| Name | Unit | Description | Default | |
| spectrum_file | File from which to read the spectral intensity profile | "" | ||
| xwidth | m | Width of source | 0 | |
| yheight | m | Height of source | 0 | |
| focus_xw | m | Width of sampling window | 0 | |
| focus_yh | m | Height of sampling window | 0 | |
| dist | m | Downstream distance to place sampling target window | 0 | |
| focus_aw | rad | Std. dev. (Gaussian) or maximal (uniform) horz. width divergence | 0 | |
| focus_ah | rad | Std. dev. (Gaussian) or maximal (uniform) vert. height divergence | 0 | |
| E0 | meV | Mean energy of neutrons. | 0 | |
| dE | meV | Energy spread of neutrons. | 0 | |
| lambda0 | AA | Mean wavelength of neutrons (only relevant for E0=0) | 0 | |
| dlambda | AA | Wavelength half spread of neutrons. | 0 | |
| flux | 1/(s*cm**2*st*energy unit) | Flux per energy unit, Angs or meV | 0 | |
| gauss | 1 | Criterion: 0: uniform, 1: Gaussian distribution of energy/wavelength | 0 | |
| gauss_a | 1 | Criterion: 0: uniform, 1: Gaussian divergence distribution | 0 | |
| randomphase | When=1, the X-ray phase is randomised | 1 | ||
| phase | Set to finite value to define X-ray phase (0:2 pi) | 0 | ||
| verbose | Generate more output on the console. | 1 |
| AT ( | , | , | ) RELATIVE | |||
|---|---|---|---|---|---|---|
| ROTATED ( | , | , | ) RELATIVE |
Source_div_quasi.comp.
[ Identification | Description | Input parameters | Links ]
Generated on 2023-09-19 20:01:36