[ Identification | Description | Input parameters | Links ]
FZP_simple ComponentA simple phenomenological thin-object approximation of a Fresnel Zone Plate. This component was adapted for neutrons from the original component written for helium scattering. The focal length of the Zone Plate is determined by the formula: \[f = 2*r*dr/(lambda)\] If a diffraction order other than 1 is wanted the focal distance is scaled accordingly.
| Name | Unit | Description | Default | |
| rad | m | Radius of the zone-plate. | ||
| dr | m | Width of the outermost ring-slit. | ||
| bs0rad | m | Radius of the central blocking zone. | 0 | |
| order | m | Use this diffaction order. | 1 | |
| eta | Efficiency of the FZP. For neutrons and (order==1) typically {5...30}%. Overrides the sigma_x cross sections. | 0.1 | ||
| sigma_abs | barn | 2200 m/s absorption cross section. | 0 | |
| sigma_inc | barn | Incoherent scattering cross section. | 0 | |
| sigma_coh | barn | Coherent scattering cross section. | 0 | |
| rho | 1 | |||
| thickness | m | Thickness of the FZP. Note that the FZP still is modelled as a thin object. The thickness is used in conjunction with the sigma_x cross sections. | 0 | |
| gamma | Duty cycle of the Zone plate - used merely for absorption estimation. | 0.5 |
| AT ( | , | , | ) RELATIVE | |||
|---|---|---|---|---|---|---|
| ROTATED ( | , | , | ) RELATIVE |
FZP_simple.comp.
[ Identification | Description | Input parameters | Links ]
Generated on 2023-09-19 20:01:36