Stefan, Jenne, Danny, TVo

We thought a bit about trying to test how the IFO reacts to different lensing by commonly reducing the CO2 powers.

Attached is a graph of the sideband build ups after turning down the CO2 power in a common way (reducing both by 1.3 Watts), along side of that there is a graph of the AS_A/B which shows any residual differential heating which probably comes from how both CO2 lasers differ in actual spherical power lensing, it seems as though there's about a reduction from 1400 counts to 1136 counts.  There is a Thorlabs power meter right before injecting into the chamber so I believe those values are good, however, if we have one CO2 lasers miscentered, that could be the problem.  

This was all locking PRMI in length only and manually tweaking the alignment to get the best build up.  What this tells us is that the TCS settings we settled on earlier in the week is helping the sideband build ups which isn't surprising because the imbalance in the ring heater powers due to the excess absorption on ITMY is quite high and any compensation in central heating will help your cause.  

Although it not quite clear if we can lock in this reduced common lens configuration, it definitely makes it much harder to reacquire (bordering on impossible).