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AdV-COM (AdV commissioning (1st part) )
mwas - 9:15 Friday 07 April 2017 (37186) Print this report
Comment to DC readout with B1s2 (37185)
Finished building the DC read-out model in the noise budget (matching the measurement with one OMC and B1s2 seeing only 8% of the light).

Figure 1, the DARM spectrum calibrated into strain, lowest point at 2e-22! A big caveat is that last week the calibration to strain done in the noise budget, and done by the proper calibration disagree by a factor ~10. We still need to investigate why the disagreement happens and which one is correct.

From 10Hz to 1kHz completely explained by MICH noise and the model and actual coupling are matching very well, after adjusting some of the fudged gains in the model by factors ~2. Above 1kHz the noise floor sits nicely on where we expect to find the quantum and electronic PD noise. The structures above 1kHz look similar to the SSFS projection but a factor 10 higher.

I have put the modeled MICH to DARM transfer function in /users/mwas/ISC/DClock_20170406. There is also there the noise budget result spectra and transfer functions. But this is less practical as it requires the matlab noise budget library in path to open the structures, using for example:
addpath(genpath('/users/mwas/advsw/NoiseBudgets/Externals/SimulinkNb'))
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