Patrick, Corey, Georgia

We have been running the old optical lever quadrant-by-quadrant effective bias measurements, accumulating data in the lead up to a potential ion-pump test. Posting the trends over the last almost-month now, for ETMX (attachment 1) and ETMY (attachment 2). I'm also posting the results from one measurement of ETMY (attachment 3), showing the transfer function of ESD quadrant drive to optical lever pitch and yaw, as a function of bias voltage, for the 3 connected quadrants.

ETMY does seem to have, on average, higher effective bias than ETMX. The measured Veff drifts significantly over time.