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- ALS
End PDH UGF improvement / post mixer LPF investigation (with in 2 weeks)
- MC/FSS
Riju measured the MC REFL PD transimpedance. See ELOG and related.
- ASC
Why do we want to see less PRM motion? I thought PRC motion was causing
LSC issue of the central part. We wanted to maximize the PRM effect, don't we?
(Or is this to supress ETM motion during full lock?)
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End PDH - good point, thanks.
ASC - Yes, this is so that we can use the POP QPD to feed back to the common ETMs after the CARM offset is already quite small. We will not use POP DC QPD for PRC any more.
Also, for future PRC ASC, I keep coming back to this in my head, but maybe it is less painful to install oplevs for PR2, PR3 than it would be to make an RF QPD. Neither is going to be trivially easy. But if we had sensors of the tip tilt motions, we could feed all of that back to the PRM to stabilize the PRC. |