Sheila, TVo

After a few attempts to fully switch the DARM control from ETMY to ETMX on the L3, L2, and L1 stage which resulted in lock losses, we decided to only switch the L3 stage to ETMX to test whether or not differences in the test mass charge is the culprit for this 10-80 Hz noise.

The python script we used to swap is attached as well as the resultant DARM signals.

After stably swapping to ETMX, we also flipped the bias sign on ETMY and reduced the biases to zero.  Then Sheila grounded the ESD to the chamber.  All of these configurations did not change the DARM spectrum.