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Length Sensing and Control (SSFS Noise)
Vajente - 14:42 Tuesday 06 September 2011 (30249) Print this report
Measurement of frequency noise coupling
This morning I injected some noise into the SSFS loop to measure again the coupling of frequency noise to dark fringe.
Here are GPS times:

Clean data
Time: Sep06,11-08:00:00 -> GPS: 999324015
Time: Sep06,11-08:10:00 -> GPS: 999324615
DARM noise (ampl. 1e-13
Time: Sep06,11-08:15:43 -> GPS: 999324958
Time: Sep06,11-08:20:54 -> GPS: 999325269
Frequency noise ampl
Time: Sep06,11-08:24:15 -> GPS: 999325470
Time: Sep06,11-08:30:40 -> GPS: 999325855

The first plot compares the CMRF measured today with one measurement done at the beginning of August. Beware the units are arbitrary here. The shape is completely different.

Second plot shows a projection of frequency noise and B5 shot noise into the sensitivity. Both are far from being limiting.
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