Sheila reported that Nutsinee switched the SEI_CONFs to BLEND_45mHz_SC_useism last night but looking this morning I see that it did not switch the Blend on ETMY.  I manually switched the (X & Y dof) Blends only; the Sensor Correction did switch to not use the BRS.  Otherwise all switching worked with Sensor Correction for all Test Masses and no BRS in use at the Ends.

State of H1: aligned and locking, has made it to NLN but lost lock, ALS Y arm fiber polarization shot up to 28%, now adjusted back down

Activities:

• Joe, visiting MY
• Fil, in MCR doing non-invasive stuff, WP6311, Mids and Ends will be next Tuesday

H1 Observations:

• ITMY rang up on lock loss
• Y arm ALS fiber polarization reached 28%, I adjusted both arms, Y = 2%, X = 5%
• lockloss tool failed to open a plot, no info on why it lost lock in NLN

It appears that the new channels in the h(t) frames contain some NaN or inf values that the DQ program refused to process. This cause the low-latency data to hang.  In order to repair this I had to set an environment variable and restart the process managers on h1dmt0 and h1dmt2. Hopefully everything will run smoothly from here out.

Attached are the results of the BSC and HAM spectra as requested by FAMIS 6871.  I didn't see anything glaring, but I also don't know what I'm looking at.

here is the timeline of yesterday evening's h1oaf0 DAC problem which required a restart of the IOP model

All times are local PST.

Prior to the problem, h1iopoaf0 STATE_WORD is 512 (OVERFLOW)

Jeff,

      This monitor has been regularly sounding. Below are the PSL dust monitors in their current configurations. There were no incursions today. No fans or environmental controls were changed and winds are below 10 mph.

J. Oberling, E. Merilh

The PSL tripped out this morning due to the commissioning work detailed here.  The cause is the ILS losing lock, which then triggered the HPO power watchdog and shut off the HPO; the 35W FE and the chillers remained operational.  The system recovered without issue and is now back up and running.  I took the opportunity to reset the injection locking counter in both Beckhoff and the Laser MEDM screen, and tweaked up the beam alignment into the PMC (hooray for remote control!) to recover the PMC transmitted power we had yesterday (alignment drift due to temperature changes in the PSL enclosure with the environmental controls on and off).

Keita Daniel

Yesterday, a large oscillation around 1 MHz was observed on the DC readout of the PMC locking diode. The DC readout is tapped directly at the HF transimpedance amplifier with a 50 Ω series resistor, see D1002163. It is available at the rack and hooked to the trigger PD input of the field box. There doesn't seem to be any termination on the rack side! The DC level of the PMC readback was about 120 mV, whereas the ILS PD showed about 1 V. The transimpedance for the PMC locking diode is 1 kΩ, where it is 820 Ω for the ILS diode. No oscillation was observed. We also looked at the signal on the RF spectrum analyzer. But, when we tried it for the ILS, the HPO tripped. End of expedition.

• No operator last night
• IFO not locked. Doin initial alignment
• Sitting in for Cheryl. She has an appointment this morning

Added 175ml to the crystal chiller

We had at least one lockloss tonight that seemed to be caused by SR2 glitches. Screenshot is attached. 

It seems like SR2 was noisier after maintence day today.  

But our main problem tonight was that the refl WFS (which we have taken in and out several times over the last week) don't work when the microseism is around the 90th percentile or more.  

This is a comparison between the ISS, ILS and PMC signals before (REF traces) and after the changes in the electroncis and the modulation depth, see 31095.

A few observations:

• The ILS HVMon signal is unchanged except above 5 kHz, where the new whitening makes a difference.
• The PMC HVMon signal now shows good coherence with ILS HVMon above 200 Hz.
  Even so there is a gain of 3 of additional loop gain at ~1.5 kHz and higher the peaks are higher than before.
  At frequencies above 1kHz the signal looks significantly better, maybe more than one would expect from the modulation depth change.
• The in-loop PDA signal from the first loop ISS looks the same.
• The out-of-loop PDB signal on the other hand now shows the same peaks as the ILS/PMC length signals—even so the overall noise level is lower.
• The feedback signal to the ISS AOM stayed very similar.
• There was coherence between the HPO power and PDB before, which is now gone.