Sheila, Keita, Nergis, Evan, Alexa
With our beloved x-arm back, we began the alignment process:
1. Aligned TMSX with ITMX baffled PDs (and ETMX misaligned). For reference:
| Volts | Gain | TMSX (P,Y) | |
| ITMX PD1 | 2.3 | 0dB | (-16,-245) |
| ITMX PD4 | 2.4 | 0dB | (52,-306) |
2. Aligned ITMX with the ETMX baffle PDs (and ETMX misaligned). Again, for reference:
| Volts | Gain | ITMX (P,Y) | |
| ETMX PD1 | -0.87 | 0dB | (6,-24) |
| ETMX PD4 | -0.85 | 0dB | (49.9,13.5) |
Yes, the ETMX baffle PDs have a negative voltage!!
3. We realigned ETMX by hand. We had to increase the max pitch PV limit from 440 to 500. We hope those were set arbitrarily; the DAC was not saturating with these higher slider values. We were able to lock the x-arm on green to a buildup of 1.4-sih, which is good.
Unfortunately the green wfs servo did not wok and would misalign the arm. We did have to turn on the ITMX ISC_INF_LOCK and MO_LOCK, and TMSX M1_LOCK filters. Unfortunately this was not the culprit. It appeared that the wfs error signal had an offset, but we did li. We want to continue with locking.
We found that TMSX had the gains for the M1 lock filters both in the filter bank gain setting and in the cal filter which was engaged. Once we set the filter bank gains to 1, the WFS worked fine. We've captured safe.snaps of both TMSX and ITMX with the configuration where the WFS were working.