J. Kissel

Today's measurement reminds us that we always need several weeks of data to really make a statement about trends when it comes to effective bias voltage. See attached data.

ETMX is still OK.

Today's data from ETMY shows that the effective bias voltage trend we thought we say last week (back towards zero) has been washed away. We see that the effective bias voltage remains as high as ~90-100 [V] in several quadrants.

We're still less that 10% actuation strength change in longitudinal however, even after the reaction chain move that decreased the actuation strength further by a few percent (see LHO aLOG 37854).

I still wouldn't raise the red flags just yet, but I'm glad that the vacuum team is "spinning up" the test mass discharge system.