With KTanaka

Summary

• We installed a PAD at OMMT2 tras, which will be used to detect a high power laser entering the OMC and protect the PDs.
• The PDA was connected to a ADC port at OMC0 rack.
• OMC0 - ADC3 - 18 was the expected channel, but apparently the wrong connection was made. (Mr Yokozawa then went to correct this.)

Details

1. By blocking the beams at OMMT2 TRAS, we confirmed which QPD is the unused one(`OMMT2_TRANS_QPDA2`).
2. Installed a PD(PDA 100A) on the QPDA2 side just after the BS. (Fig 3)
3. Used Moku:Lab with a short USB cable to check the signal and adjusted the alignemnt by changing the alignment of the BS.
4. Changed the gain on the PDA to be 70dB which is the maximum, which gave 778mV output measured by the Moku:Lab. The interferometer status at the time: Yarm IR locked, IMC 1W output. (Fig 1, 2)
5. Routed a long cable (20 m?) from this PDA to the OMC0 rack. (Crawled across the ceiling.) (Fig 4)
6. Connected the BNC to a port at OMC0 - ADC3. Num18 was the expected channal, but wrong connection was made.

Note

• The PDA installed was brought from Yend yesterday by Yokozawa-san.
• The long USB cable used were taken from a PEM rack (IYC-K-A-1). With permission of Yokozawa-san.
• The power supply for the PDA was placed in a small rack next to the OMM chamber. The source of its AC power line is SC-12-4.