daniel.sigg@LIGO.ORG - posted 11:20, Thursday 16 April 2015 - last comment - 07:30, Friday 17 April 2015(17911)
IMC Open Loop Transfer Function
Following up on the TTFSS work in alog 17885, we remeasured the input mode cleaner open loop transfer function.
The ugf is 50 kHz. With 3 dB of additional gain we can push this to 100 kHz and engage the second boost stage. The gain margin will be a little marginal at 1-2 dB, so.
For the measurement the common gain was at 18 dB, the fast gain at –6 dB, the compensation and one boost stage was engaged.
The small feature at 750 kHz is still there but of little relevance. This now closely resembles the iLIGO configuration and behavior.
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Again, just because this is how it will be for the forseeable future, I post a more reader-friendly version with notes reflecting the above entry. Hope this helps!
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