thomas.vo@LIGO.ORG - posted 17:49, Wednesday 23 May 2018 - last comment - 08:45, Thursday 24 May 2018(42165)
IMC UGF Adjusted
Sheila, TVo
We noticed that the boost filter would cause the IMC to oscillate so we checked the OLTF again and found the UGF at 4 kHz, so we added +15 db to the servo gain and found a new UGF of about 30 kHz. This is probably due to the new EOM changing the modulation depth.
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This seems high. The modulation depth is estimated to be only 3 times lower.
Yeah it did seem odd, but we reduced the gain by 4db here previously. So in the end it's about +11db which is close to what we'd expect from the EOM swap, maybe.