Reports until 12:43, Monday 19 November 2018
H1 ISC (ISC)
stefan.ballmer@LIGO.ORG - posted 12:43, Monday 19 November 2018 (45400)
Memory dump: Things I saw at LLO that I think LHO should copy
Dither alignment for soft loop:
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Instead of doing A2L decoupling repeatedly LLO does control the soft loops DC continuously using 8 dither lines between 7 and 9 Hz. That system seems to work well for them. LHO currently uses the end station QPDs, as well as effectively the POP QPD to fix the DC positions. While I have no indication that LHO's system is unreliable, I have noticed that S2L seems to change when we change arm power. So I would suggest just copying LLOs dither system - at least as independent diagnostics. WE can still decide whether or not we want to run with it continuously.

LSC DC DQ channel:
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H1:LSC-POP_A_LF_OUT_DQ H1:LSC-REFL_A_LF_OUT_DQ and H1:LSC-REFL_B_LF_OUT_DQ are currently only recorded at 2048Hz in Hanford. Those channels have interesting information  about intensity noise and RF sideband intensity noise at higher frequencies, and should be recorded at 16384Hz (that's what they are at LLO).