With Yokozawa-san
We performed the initial alignment for Xarm, Yarm, OMC and PRMI.
With Yokozawa-san
We performed the initial alignment for Xarm, Yarm, OMC and PRMI.
Detailed report.
Before starting the alignment work, we confirmed that all Type-A suspensions went to LOCK_ACQUISITION.
We followed the MEDM procedure for the Xarm alignment. First, we requested IRX_LOCKED, and then requested GRX_LOCKED_WITH_IRX. At this step, it took some time to lock the arm. Therefore, PR3 was slightly moved to improve the locking condition.
After that, we requested ALIGNING_XARM. Since the GRX transmitted power was not good enough, we manually adjusted ETMX and ITMX. As a result, the transmitted powers became approximately GRX ~ 0.96 and IRX ~ 0.95.
Then, we requested RECORD_GOOD_VALUES_XARM and performed OFFLOAD.
We also followed the MEDM procedure for the Yarm alignment. We requested IRY_LOCKED, GRY_LOCKED_WITH_IRY, and then ALIGNING_YARM. The alignment condition was already not bad, so we did not perform any manual adjustment.
Then, we requested RECORD_GOOD_VALUES_YARM and performed OFFLOAD.
For the OMC alignment, we followed the MEDM procedure as well. We requested IRY_LOCKED_FOR_OMC and then INCREASE_LAS_POW_FOR_OMC. We waited until the Guardian comment showed READY.
Then, we requested ALIGNING_TO_OMC. We monitored K1:OMC-TRANS_DC_SUM_OUT16. The value was around 30, which was acceptable. We note that a value larger than about 60 may be dangerous for the OMC DC PD.
Finally, we requested RECORD_GOOD_VALUES_OMC. After recording the good values, the OMC alignment state automatically went down.
For the PRMI alignment, we requested ALIGNING_PRMI following the MEDM procedure. At this step, ADS was engaged for IMMT2, PRM, and BS.
After the alignment became stable, we requested RECORD_GOOD_VALUES_PRMI and then performed OFFLOAD.