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[ Identification | Description | Input parameters | Links ]
The Incoherent_process Component
Component implementing a true incoherent scattering process
Identification
- Author: Mads Bertelsen and Erik B Knudsen
- Origin: ESS DMSC & DTU Physics
- Date: 20.08.15
Description
This Union_process is based on the Incoherent.comp component originally written by Kim Lefmann and Kristian Nielsen. Part of the Union components, a set of components that work together and thus separates geometry and physics within McXtrace. The use of this component requires other components to be used. 1) One specifies a number of processes using process components like this one 2) These are gathered into material definitions using Union_make_material 3) Geometries are placed using Union_box / Union_cylinder, assigned a material 4) A Union_master component placed after all of the above Only in step 4 will any simulation happen, and per default all geometries defined before the master, but after the previous will be simulated here. There is a dedicated manual available for the Union_components Algorithm: This component is an approximation. It scatters completely isotropically.
Input parameters
Parameters in boldface are required; the others are optional.| Name | Unit | Description | Default | |
| sigma | barns | Incoherent scattering cross section | 5.08 | |
| f_QE | 1 | Fraction of quasielastic scattering (rest is elastic) | 0 | |
| gamma | 1 | Lorentzian width of quasielastic broadening (HWHM) | 0 | |
| packing_factor | 1 | How dense is the material compared to optimal 0-1 | 1 | |
| unit_cell_volume | AA^3 | Unit_cell_volume | 13.8 | |
| interact_fraction | 1 | How large a part of the scattering events should use this process 0-1 (sum of all processes in material = 1) | -1 | |
| init | string | Deprecated and unused. Accepted so that instruments written for McStas/McXtrace 3.8.7 and earlier, which name the Union_init component here, still compile. | "" |
| AT ( | , | , | ) RELATIVE | |||
|---|---|---|---|---|---|---|
| ROTATED ( | , | , | ) RELATIVE |
Links
- Source code for
Incoherent_process.comp. - The test/example instrument Test_Phonon.instr.
[ Identification | Description | Examples | Input parameters | Links ]
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