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material_parameters
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material_parameters [2018/01/24 15:44] 185.62.108.185 |
material_parameters [2019/02/21 23:44] (current) pklapetek |
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| defining how the system should get the material data. Each row starts by material index (to match | defining how the system should get the material data. Each row starts by material index (to match | ||
| the indices in the VTK file or vector file defining the [[sample_geometry|sample geometry)]]. | the indices in the VTK file or vector file defining the [[sample_geometry|sample geometry)]]. | ||
| - | Then, material type is listed (0 for direct definition of n, k, density and attenuation, 99 for use of the xraylib database). For material type = 0 the further four values are real and imaginary part of the refractive index, density (in g/cm3) and attenuation coefficient. | + | Then, material type is listed (0 for direct definition of n, k, density and attenuation, 99 for use of the Xraylib database). For material type = 0 the further four values are real and imaginary part of the refractive index, density (in g/cm3) and attenuation coefficient. |
| - | For material type = 99 the element or compound chemical formula is written. Moreover we have two parameters that | + | For material type = 99 the element or compound chemical formula is written and everyting is obtained from Xraylib database on basis of the source energy and default material density as provided in Xraylib. Moreover we have two parameters that can be used to force the system to use different values of density and attenuation coefficient than those obtained from the Xraylib database. This is most usually not needed and can be left zero to get the values from Xraylib. |
| - | can be used to force the system to use different values of attenuation coefficient and density than those | + | |
| - | calculated from the Xraylib database. This is most usually not needed and can be left zero to get them from Xraylib. | + | |
| + | An example of the materials file entries is shown below: | ||
| <code> | <code> | ||
| 0 0 1 0 0 0 | 0 0 1 0 0 0 | ||
| - | 1 0 0.9999 2 3 4 | + | 1 0 0.9999 0 5 0 |
| 2 99 Si 0 0 | 2 99 Si 0 0 | ||
| 3 99 Cr 0 0 | 3 99 Cr 0 0 | ||
| Line 28: | Line 27: | ||
| </code> | </code> | ||
| which uses the supplied density for the particular index, but calculates everything using Xraylib as usual based on this density. | which uses the supplied density for the particular index, but calculates everything using Xraylib as usual based on this density. | ||
| + | |||
| + | Note that at present the compound parser does not work properly for density of compounds (only elements). | ||
| + | |||
| + | The density itself affects refractive index, however sometimes it is desirable to keep it and affect only attenuation length. This can be done by altering its value in the material table (fourth material constant). | ||
| + | |||
material_parameters.1516805082.txt.gz · Last modified: 2018/01/24 15:44 by 185.62.108.185
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