Jennie Wright, Khanh Vu

This morning, we entered the calculated values into the sensing matrices on the JAC menu. We encountered a few points of confusion that are worth mentioning:

1. The calculated matrix contains 16 values because it is a 4x4 matrix, with four possible angular actuator offsets and pitch and yaw readout channels from two wavefront sensors. However, the matrices on the JAC panel contain only eight inputs. This design assumes that, ideally, a yaw actuation produces only a yaw signal and a pitch actuation produces only a pitch signal. In practice, the system is not perfectly decoupled, so we observe cross-coupling between pitch and yaw, leaving us with more than eight matrix entries.

2. For the PZT actuator, the relationship between pitch and yaw is reversed. A pitch offset produces a signal in the yaw channel, while a yaw offset produces a signal in the pitch channel. This is due to the configuration of the optical components, and this convention has been maintained in the control system.

We will continue working on the sensing matrix on Monday to determine how to account for these issues.