J. Kissel

I've processed the DARM OLG TFs from Thursday (see 18443), and found that the DARM Coupled Cavity Pole Frequency seems relatively stable at 350 +/- 10 [Hz] with respect to IFO power. Admittedly, the data at 23 [W] is only over a small frequency range and is varying by ~5% (even though, as usual, I applied at 0.99% coherence threshold cut on the data points), so that's why I put a +/- 10 [Hz] on the number I quote. I think we'll either have to (a) get more DARM sweeps, (b) use Kiwamu's LSC DCCP tracker, and/or (b) get the PCAL demodulation up and running to check it this is consistent from lock-stretch to lock stretch.

The ITMs are under control for all of these data sets, and the SRC1 yaw loop is tuned as described in LHO aLOG 18442 for the latter three. For all four measurements SRCL to DARM subtraction, ("FF") was off.