RFC alignment in LN3
We moved the setpoints of the piezo from around 17h45 UTC to 18h10. We improved the alignment as shown in fig.1
(We also updated the thresholds in the DMS).
SBE EIB noise injections in LN3 (sine @ 0.5Hz)
| DOF | gps start UTC | duration | amplitude pp |
| tx | 18:22:45 | 3 min | 10 urad |
| ty | 18:26:50 | 3 min | 10 urad |
| tz | 18:31:10 | 3 min | 10 urad |
| x | 18:34:40 | 3 min | 10 um |
| y | 18:38:08 | 3 min | 10 um |
| z | 18:41:39 | 3 min | 10 um |
Analysis of the noise injections will follow.
We checked some signals of interest after the realignment of the RFC and could not see any clear improvment neither in LN3 (figure1) nor in INJ stand alone (figure 2).
To be noted that we managed to improve the alignment only using the PZT mounted on M19.
The PZT mounted on M20 had a strange behavior (red circle on figure attached). We were doing steps of 5V that were slightly changing the transmission and but then this transmission was going back to its original value by its own. Nothing was visible on the QPD.
