(Keita, Daniel)
Today we measured and adjusted the gain/phase of the WFS RF signals. WFS_A looks fine, but WFS_B has segments 3 and 4 which are ~10x smaller than 1 and 2. Engaging DOF4 did result in a stable feedbakc but with a rather large offset. We added an offset to segment 4 of WFS_B to recover. Adding DOF3 did not result in a stable feedback.
Playing around with the individual pit/yaw offsets and the WFS DC centering one can find feedback topologies with all 4 DOFs engaged. However, they are susceptible to disturbances.
For this measurement the WFS offsets are:
First measurement shows an ETMY yaw misalignment by 1 µrad. The power drops by about 15%. The yaw offsets are of order 10,000 counts. We also see a significant pitch ofset. But, more importantly the DC offsets on the WFS heads are also very large. The WFS servo was off during the measurement.
The second plot shows the effect of moving the picomotor for WFS_B by about 0.2 in yaw and 0.3 in pitch. The resulting offsets are of order 7000. Since the WFS servo was off, there was no degradation of the cavity power.