matthew.evans@LIGO.ORG - posted 09:54, Saturday 07 July 2012 - last comment - 10:19, Saturday 07 July 2012(3350)
SUS work for OAT - R0 damping in place
As a first step to making the L1 and L2 sensors useful, I brought the reaction chain damping up to speed. It now matches the main chain on both the ITM and ETM. I also spent some time playing with M0 gains and filters, but without any definitive success. Some directions to explore:
- decouple long-pit drives
- add L1 damping loops
- add optical lever damping
- improve SEI performance in 0.3-2Hz band
I'll poke at the first of these today.
In the process I added a new filter for L damping: 0.43HzBoost2. It just adds a little more gain around 0.43Hz, which flattens more the peak there. It does what it should, but had little effect on the motion seen at the L1 and L2 levels.