[Sheila, Masayuki]

This morning we investigated the POP clipping. It is hard to say what is going on there. Our conclusion is that we need to use the picomotors to fix it, so we will wait until next week after the GV is open, and then work on finding good pico positions for POP and green.

- We started by maximizing LSC POP LF by moving the PR2 spot position. I used the PR2_SPOT_MOVE state of the ISC guardian and moved PR3 to maximize LSC POP LF and POP_X DC.  I also moved PM1 to look for a position that suits both.
- This way we can only maximize LSC POP, not LSC POP and POP X together. The maximum of LSC POP was ~7.5, with MICH on the dark fringe (REFL bright).
​​​​​​​- One strange thing we saw is that LSC POP behaved oddly during the PR3 sweep. As the attached time series shows, it has a broad flat shoulder. If this were simply clipping, the signal should rise continuously and then flatten at the top. We have not worked out what is happening there.