Inhomogenous incoherent process in Union

mcstas-comps/examples/Tests_union/Test_inhomogenous_process/Test_inhomogenous_process.md

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+# Test instrument for the Inhomogenous_incoherent component
+
+### Author: Daniel Lomholt Christensen @NBI
+
+This instrument is a test for the Inhomogenous incoherent process component, that works with the McStas Union system.
+
+
+Below I have tested the implementation in three important setups. For each setup, I use three different approaches.
+First I build the union materials with the Incoherent_process component (and here 10 Union_boxes are used).
+Secondly I build the union materials with the Inhomogenous_incoherent_process (here using only 1 component, but setting the number of sampling points to 10).
+Thirdly I build a material that uses both the Inhomogenous_incoherent and incoherent processes, to perform the same action.
+
+
+The first two setups, I have a detector placed on the side of a sample, with 10 different boxes that follow each other.
+For the first experiment, the boxes have the same scattering cross section.
+For the second experiment, the boxes vary according to a linear rise in scattering cross section.
+For a visualization of these setups, see the below figure,
+![Sketch of instrument](experiment.png)
+
+And the results of the first experiment is,
+![Results experiment 1](sigma_const.png)
+
+While the results of the second experiment is,
+![Results experiment 2](linear_sigma.png)
+
+For the last setup, the detector is placed in a transmission geometry, with the 10 boxes rotated 90 degrees.
+This means that they vary their scattering cross section linearly across x in the mcstas coordinate system.
+The result of this is,
+![Transmission geometry](trans_linear.png)
+
+Another experiment is performed, just to check that adding a directional process, such as the PhononSimple_process does not break the system.
+This material is created with the linearly rising scattering cross section, implemented with the Inhomogenous process, as well as a PhononSimple_process.
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+
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