TITLE: 03/27 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Observing at 119Mpc
INCOMING OPERATOR: Jeff
SHIFT SUMMARY:

During this DAY shift O3 was officially suspended (due to COVID-19).  So there were a couple hours of Observing at the beginning to close out O3 at the beginning of the shift and then it was in Robert's hands the rest of the shift for his PEM Injection work.
LOG:

• 14:39 Incoming EQ Alert (5.8 from Palau)
• 17:00 O3 Officially Suspened & H1 Out of OBSERVING concluding O3b!
  • Observatory Mode set to COMMISSIONING for PEM Injections by Robert
• 17:00-20:02 EY PEM Injection morning work (Robert)
• 21:01 Verbal Alarms put in a mode which does not have alerts that need to be acknowledged.  (TJ & Robert took care of this)
• 21:33 EY PEM Injection afternoon work (Robert)

The H1CDS_POST_O3_OVERVIEW_CUST.adl MEDM is now the default CDS overview when opened from the SITEMAP. Currently the changes are:

• WAPs are now nominally engaged, GREEN=ON
• Front end excitations changed from RED to PURPLE
• Front end SDF diffs also changed from RED to PURPLE

In the new scheme, RED is reserved for issues which could impact on phase-3 safe operation of the suspension and seismic systems.

This is some data that I've been sitting on for quite a while, taken on Jan 30th (54822)

I've used a time when squeezing was not injected to get a cross correlation, and estimated the squeezing level by subtracting this correlated noise, as was done in 53443 and 51981.  One potential problem with subtracting the noise in this way is that the radiation pressure noise is correlated noise, but it will also change when the squeezing level and angle change.  We can't use this type of techinque to infer the squeezing level at lower frequencies, but it's fine around 100Hz and above, as seen by comparing the correlated noise in the first attachment to the radiation pressure curves. I am using the pyDARM sensing function model to convert noises in mA to strain, but the strain curves here are GDS strain; above about 4kHz the shot noise curves look wrong because I am not applying GDS corrections to pyDARM.

The second attachment shows the anti-squezing and squeezing level, estimated with correlated noise subtracted.  You can see that there is more squeezing and more anti-squeezing at frequencies below 300Hz than above 1kHz, indicating that there is something like a frequency dependent loss happening.  This is consistent with what we've been seeing for a while and could be explained by the modeling Lee did in 50610. 

There is also a frequency dependent squeezing angle shift, shown in the 3rd attachment.  Here I've plotted the median squeezing level in different frequency bands, as the CLF demod angle is varied.   The lower frequency points have higher levesl fo both squeezing and anti squeezing, which is consistent with a frequency dependent loss, but there is also an offsett between the lowest noise CLF angle for the high and low frequencies. 

Chandra, Dave:

The cell phone vacuum alarm level for PT245B was reduced from 5.0e-07 to 5.0e-09 Torr and the system was restarted at 12:12PDT.

Due to the COVID-19 pandemic, this morning at 17:00utc (10am local PDT), LIGO & Virgo suspended Observing for Observing Run #3.

Seconds after 17:00:00, Robert set off to continue Day 3 of PEM Injection work by venturing out to EY.

H1's been locked almost 60hrs.

TITLE: 03/27 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Observing at 117Mpc
OUTGOING OPERATOR: Niko
CURRENT ENVIRONMENT:
    SEI_CONF state: WINDY
    Wind: 4mph Gusts, 3mph 5min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.17 μm/s 
QUICK SUMMARY:

• H1 locked for over 55.5 hrs.  There is an incoming EQ alert (5.8 from Pilau).  Other than that looks like a nice evening with a moderate EQ from either Iran or Indonesia which H1/L1/V1 rode through.
• Today will begin Day 3 of PEM Injection work later.

TITLE: 03/27 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Observing at 117Mpc
INCOMING OPERATOR: Niko
SHIFT SUMMARY:

Uneventful shift

• H1 locked and Observing
• Handing off to Niko

It's been a good run! Sad to see it end.

LOG:

05:14 EX saturation

01:20 Robert done and leaving site.

Everything run ning nominally well.

I spent about 5 IFO hours making acoustic and magnetic injections at the corner and EX stations. Will resume Friday.

TITLE: 03/26 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Observing at 118Mpc
OUTGOING OPERATOR: Corey
CURRENT ENVIRONMENT:
    SEI_CONF state: WINDY
    Wind: 11mph Gusts, 8mph 5min avg
    Primary useism: 0.05 μm/s
    Secondary useism: 0.19 μm/s
QUICK SUMMARY:

Robert down to EX

• H1 Intention bit set to Commissioning
  • Observatory mode to COMMISSIONING
• EX WI-FI turned on

TITLE: 03/26 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Observing at 118Mpc
INCOMING OPERATOR: Ed
SHIFT SUMMARY:

H1 locked the whole shift (had drop in range due to squeezer which was eventually addressed).  PEM Injection work by Robert continues.
LOG:

• 15:47 EQ Alert of 6.2 from Phillipines (still in GREEN band, but close to Yellow "large EQ" band, so will monitor.
  • 16:26 SEI_CONF automatically transitioned to EARTHQUAKE (back to WINDY at 16:36)
• 16:58 Out of Observing for PEM Injections (Observatory Mode to COMMISSIONING)
• 16:59 LVEA Transitioned to Laser SAFE
• 20:10 Back to OBSERVING (note:  took a few minutes to turn off WAP for LVEA & CER...Verbal gave me a heads up that I missed this)
• 21:44 EQ Alert 5.8 Papua New Guinea (doesn't look bad so far)
• 22:18 Happened to notice H1 range drop & see that we have DIAG MAIN message:  20:18 SQZ OPO REFL POWER has increased
  • After confirming with Jenne, I took SQZ_MANAGER from SQUEEZING --> DOWN --> back to SQUEEZING
  • 22:21 Out of Observing to toggle SQZ_MANAGER.
  • 22:23 Back to OBSERVING
• 22:55 Robert driving down to End-X to begin Evening PEM Injections.

At 22:18 (3:18pm local), noticed the H1 range had been trending down a few Mpc over the last 90min (missed this while listening in on meetings).  Then noticed that DIAG_MAIN had the following message:

20:18 SQZ OPO REFL POWER has increased

Consulted with Jenne and she confirmed I'll need to toggle the SQZ_MANAGER.  Took SQZ_MANAGER from SQUEEZING --> DOWN --> back to SQUEEZING & H1's range returned to normal.

• H1 continues to roll with a lock of over 31.5hrs (rode through a 6.1 EQ from Phillipines this morning). 
• For last ~2hrs, have been out of Observing for PEM Injection work by Robert.

This is by Robert & is for PEM Injection work.  WP #8577.

TITLE: 03/26 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Observing at 116Mpc
OUTGOING OPERATOR: Cheryl
CURRENT ENVIRONMENT:
    SEI_CONF state: WINDY
    Wind: 7mph Gusts, 5mph 5min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.24 μm/s 

Microseism had a bump up over the last 24hrs, but also bumped back down.
QUICK SUMMARY:

H1's been locked for almost 32hrs.  As for today, PEM Injections by Robert is on the docket. 

TITLE: 03/26 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Observing at 117Mpc
INCOMING OPERATOR: Cheryl
SHIFT SUMMARY:

Shift went smoothly.

There was some PEM testing that went on for a few hours. Other than that, I'm nahding off a locked/observing H1 off to Cheryl
LOG:

04:17 EX Saturation

I worked in the LVEA for a couple of hours, mainly setup but got a couple of acoustic coupling measurments.