Evan, Lisa, Sheila, Dan, Alexa, Kiwamu
Summary
With DARM on ASAIR_RF45_Q and CARM on analog REFLAIR_RF9_I at zero CARM offset, we were able to transition the DRMI 3f signals from REFLAIR_B to the 1f POPAIR_B signals.
The locking sequence is scripted in the guardian up until this point.
Details
By exciting PRM, we adjusted the demod phase of POPAIR_B_RF9 and POPAIR_B_RF45. In both cases we maximized the I signals, and found 66.6º and -30º for RF9 and RF45 respectively. Then, we excited PRM, SRM, and BS at 137 Hz, 137 Hz, and 53 Hz respectively. The folder /ligo/home/alexan.staley/Public/Spectra_3F2POP contains the DTT files, which have the power spectra for all the POPAIR_B signals, as well as transfer functions to the respective REFLAIR_B signals. The input matrix is as follows:
| POPAIR_B_RF9_I | POPAIR_B_RF45_1 | POPAIR_B_RF45_Q | |
| PRCL | 0.27 | 0 | 0 |
| MICH | 0 | 0 | 0.54 |
| SRCL | 0.041 | 0.74 | 0 |
When locked with the POP signals, we measured all three loops and found that they were all at the appropriate UGFs with good phase.