J. Warner, K. Venkateswara

We tried sensor correction in Z direction on HEPI using the GND_STS, while keeping the X direction sensor correction on Stage 1 using the ground super-sensor. The two attached pdfs show the result before and after. The result is almost the same level of performance in both X and Z with some improvement in Oplev YAW motion at ~0.15 Hz with HEPI sensor correction. This probably reduces the Stage 1 Z actuation, hence reducing the Z to RZ coupling.

We will try the X sensor correction to HEPI in the afternoon, after install activity at EX is completed.