For this afternoon’s lock we turned up the ETMX ring heater to 0.75W and the ETMY ring hearer to 0.7W. Sat at 47W and lost lock to a new PI at 14.685 kHz, 70Hz lower in frequency than the previous one (first attachment). This mode showed up more strongly in the ETMX TR QPDs (see second attachment) by a factor of 2. The last one that was stronger in the ETMY QPDs.

 

We’ve lowered the ETMX ring heater back to the O3 value (0.45W). And left ETMY at 0.7W. 

 

The game of whack-a-mode continues...