aLIGO LHO Logbook

H1 CDS (CDS, ISC, SEI, SUS)

jeffrey.kissel@LIGO.ORG - posted 21:14, Friday 14 December 2018 - last comment - 21:45, Friday 14 December 2018(45958)

All Models Compared against OBSERVE SDF File, and Accepted in Nominal Low Noise

J. Kissel, T. Vo, H. Yu, K. Kawabe, C. Vorvick, D. VanderHyde

Hang got us through low noise ASC, and we pushed through switching to low noise ETMX and into nominal low noise for the first time in DAYS. Hooorrrrray!! 

As we were reconciling all SDFs for all models against their OBSERVE files (which we were able to do and we blindly accepted everything), and clearing guardian nodes, in order to got to OBSERVING mode, the wind decided to pick up to 40 mph, and we lost lock. 10 minutes at ~75 Mpc...

Comments related to this report

jeffrey.kissel@LIGO.ORG - 21:23, Friday 14 December 2018 (45959)GRD, ISC, OpsInfo

Link

We had to adjust a few things in guardian nodes -- namely change some nominal states:
    LASER_POWER from 30W to 20 W
    VIOLIN_DAMPING from IDLE to DAMPING_ON_DC
    LOCKLOSS_SHUTTER_CHECK from HIGH_ARM_POWER to LOW_ARM_POWER
and we had a few of the old SPM differences on the ITMs causing warnings on the RX / RY ST2 tramps.

We also had to add the ISC_LOCK guardian node to the "ignore" list
    /opt/rtcds/userapps/release/sys/h1/guardian/IFO_NODE_LIST.py
because it was getting a notification that IMC_LOCK had a notification, which we know is because the IMC WFS are not centered -- a problem we will not fix during this run.

jeffrey.kissel@LIGO.ORG - 21:29, Friday 14 December 2018 (45960)

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Also -- during the time that Hang was tuning ASC loops, I was going through the "passive" models in the SDF system like IOP models, SUSAUX models, PEM models, CAL models, PSLDBB models and switching them to compare against the OBSERVE files, making sure everything was monitored (the only major changes were some IOP DACKILL channels that didn't exist before in the IOP models, and a bunch of filter settings in the unused SUSAUX models) and accepting everything.

keita.kawabe@LIGO.ORG - 21:45, Friday 14 December 2018 (45962)

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There was a huge hump at around 30-40Hz in DARM which came from DHARD_Y during that 75Mpc time.

This was because EXLP_LBW filter in DHARD_Y (FM2) was not enabled before going into nominal low noise (due to manual operation error).

Next time it's locked in nominal low noise this will be enabled by the guardian, SDF will complain (because no-FM2 configuration was accepted), so you need to accept that again. It's also be a good idea to run a2l.

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