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hugo ref beam: explain effect of intensity on noise (#873)

Merged Wuttke, Joachim requested to merge j.0 into main
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@@ -19,12 +19,16 @@ For the glancing angle $\alpha\_\text{i}$, use unit multiplier `*deg`.
The azimuthal angle $\varphi\_\text{i}$ can be omitted,
as in most applications the default value 0 is pertinent.
After creation of a beam, special properties can be set with
After creation of a beam, properties can be set with
```python
beam.setIntensity(intensity)
beam.setFootprintFactor(footprint)
beam.setPolarization(polarization)
```
For the arguments, see [footprint](footprint) and [polarization](../pol).
The beam intensity may appear inconsequential for specular simulations
because resulting reflectivities are normalized.
However, the intensity does influence the simulated [noise](/ref/sim/setup/bg).
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