J. Kissel for D. Tuyenbayev

Darkhan turned on both a PCALY and SUSETMY L3 calibration line at 30.1 Hz yesterday night. The idea is that these lines, driven at the same frequency but exactly opposite in phase, will cancel each other out and not cause any impact on the sensitivity. The hope is that we can use this scheme in the future -- tracking the residual of cancelling PCAL and ETM actuator lines, instead of driving them very loudly right next to each other.

We plan to leave this line in for a few days, and then we'll turn it off.

Currently -- because we haven't had too many long lock stretches, the phases of each line are not tuned well, so there may still be a pretty large residual. We'll continue to work on it as the duty cycle improves. Your patience is appreciated.