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As with the system models, the various noise models also come in different versions. You can build these noise models individually and inspect their responses. Let's look at a couple of examples.
For example, let's build the noise model used for generating force and torque noise of the
GRS actuation. The model is called DIST_CAPACT.
We start by inspecting the model to see what versions are available, and, within each version,
the parameters available for setting. Start with opening the model documentation:
help ssm_model_DIST_CAPACT
% Build the default version of the GRS CAPactive ACTuation noise model
GRScapactNoise = ssm(plist('built-in', 'DIST_CAPACT'));
GRScapactNoise.viewDetails
As another example, let's build the noise model used for generating readout noise of the
interferometer. The model is called DIST_IFO_READOUT.
Again, start by inspecting the model to see what versions are available, and, within each version,
the parameters available for setting. As before, open the model documentation with:
help ssm_model_DIST_IFO_READOUT
% Build the default version of the IFO Readout noise model
IFOreadoutNoise = ssm(plist('built-in', 'DIST_IFO_READOUT'));
IFOreadoutNoise.viewDetails
This noise source is added after the modelling of the actual conversion of the TMs position into an IFO reading, so it represents noise sources such as shot noise in the beams, electronics noise (additive, digitization, ...).
Other noise sources that act 'common mode' on all IFO channels, such as laser frequency fluctuations, are modelled by the DIST_IFO_POSITION noise model, that can be built by doing:
% Build the default version of the IFO so-called position noise model
IFOfrequencyNoise = ssm(plist('built-in', 'DIST_IFO_POSITION'));
IFOfrequencyNoise.viewDetails
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