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Reports until 15:38, Thursday 26 July 2018
H1 ISC
jenne.driggers@LIGO.ORG - posted 15:38, Thursday 26 July 2018 - last comment - 18:40, Thursday 26 July 2018(43093)
DRMI locked with arms off resonance

[Commissioners]

Work still in progress, but we just locked ALS COMM and DIFF, moved them off resonance, and were able to acquire DRMI lock.  This is the first time for us since late 2017, so we're pretty happy!

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gabriele.vajente@LIGO.ORG - 15:39, Thursday 26 July 2018 (43094)
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gabriele.vajente@LIGO.ORG - 16:55, Thursday 26 July 2018 (43096)
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Other actions:

  • pico'ed AS_C to center the beam in DRMI
  • changed thresholds for DRMI lock
  • tried to close some ASC loops in DRMI: MICH seems ok, INP does not work
craig.cahillane@LIGO.ORG - 18:40, Thursday 26 July 2018 (43098)ISC
Link 

We altered the COMM and DIFF PLL offsets in guardian so now ISC_LOCK can get through CHECK_IR by itself.  Diff offsets are not very robust.

We were able to close MICH and INP1, but not PRC2.  Fixed some ENGAGE_DRMI_ASC guardian code to engage both pitch and yaw LOCK filter modules for PR2 and SR2 (was only engaging pitch FMs, which was causing our instant locklosses when engaging PRC2).  Now PRC2 is just regular-old unstable.
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