FranciscoL, RickS
On Tuesday, March 18, we moved the PCALX lower beam by r = 2.5mm, \theta = +237 deg from its nominal center. We expect to see a change of 20 HOPs in \chi_XY -- returning to the value it was a week ago.
Placed target in the same alignemnt as in the previous actuation (TARGET_ON). Both individual beam voltage values, as found, were very similar to the values recorded at the end of the move done last week. We actuated by turning counterclockwise on the pitch adjuster of the outer beam folding mirror, with minor adjustments in yaw. The voltage of the lower beam after the move was higher than last week, it could be from AoI of the optics, but documenting here for future reference.
The following table shows the voltage values as read by the Keithley voltmeter we use during the procedure
| Step | Comment | Readout [V] |
|---|---|---|
| 1 | Both beams - target off | 3.377 |
| 2 | Both beams - target on (as found) (BEFORE_MOVE) | 2.896 |
| 3 | Lower beam after actuation | 1.43 |
| 4 | Both beams - target on (AFTER_MVOE) | 2.940 |
| 5 | Both beams - target off | 3.383 |
We have one more actuationg left in which we move the beam back to nominal center. For the upcoming move, we expect \chi_XY to stay the same.
