[Keita, Jenne, Sheila, Georgia]

Today we had a quick look at the long trends of a few parameters before and after our 35 to 37W power up.

The attachment shows IMC input power, arm cavity circulating powers (calibration needs updating); PR gain; optical gain (kappa_C) and the DARM coupled cavity pole.

• We increased the input power by ~5%, and saw an increase in the arm cavity circulating powers of ~5% (good)
• The power recycling gain (POP/IM4_TRANS) dropped by ~2% (bad)
• Kappa_c dropped by ~2% (bad)
• The cavity pole increased by ~5Hz (good)

The drop in kappa_c but corresponding increase in cavity pole may suggest we need to revist our OMC ASC offsets to find an alignment that better optimised optical gain.

We also might want to revisit differential TCS settings (first guess: increase CO2X again to compensate for extra heating on ITMY).