TITLE: 02/26 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
    SEI_ENV state: MAINTENANCE
    Wind: 6mph Gusts, 3mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.26 μm/s 
QUICK SUMMARY:

HAM1 work is quickly heading towards doors!

TITLE: 02/26 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY: More HAM1 work done today, we're very close to closing
LOG:
Sophie will post log as comment

TITLE: 02/25 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
    SEI_ENV state: MAINTENANCE
    Wind: 9mph Gusts, 6mph 3min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.19 μm/s 
QUICK SUMMARY:

More JAC work today

Famis 39976 Inspect quarterly trends of HWWD bits for indication of negative function. 

All traces have had some motion on it in the last 91 days.

TITLE: 02/20 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY: More HAM1 alignment work today
LOG:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          

TITLE: 02/19 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
    SEI_ENV state: MAINTENANCE
    Wind: 17mph Gusts, 10mph 3min avg
    Primary useism: 0.03 μm/s
    Secondary useism: 0.36 μm/s 
QUICK SUMMARY:

More HAM1 work today

TITLE: 02/19 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY: HAM1 work continued today
LOG:                                                                                                            

TITLE: 02/18 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
    SEI_ENV state: MAINTENANCE
    Wind: 3mph Gusts, 1mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.44 μm/s 
QUICK SUMMARY:

More HAM1 work today

TITLE: 02/12 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY: Dave did some CDS restarts early in the day, alog89133, and alog89130 and again at the end of the day. Secondary microseism has gone up quite a lot in the past 9 hours, presumably from the 10.5m (windy.com) waves crashing into the Juneau/Ketchikan area north of Washington state. VAC team left an AUX cart pumping down by HAM4. HAM1 alignment and EOM crystal work continued today.
LOG:                                                                                                                                                                                                  

TITLE: 02/12 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
    SEI_ENV state: MAINTENANCE
    Wind: 3mph Gusts, 1mph 3min avg
    Primary useism: 0.05 μm/s
    Secondary useism: 0.28 μm/s 
QUICK SUMMARY:

• HAM1 work continues today
• Lots of patches of thick fog around town and site

TITLE: 02/12 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY: HAM1 work continues, HAM7 is pumping down.
LOG:                                                                                                                             

18:15 UTC HAM7 SEI SW watchdog trip from a H7 crash, FE & ADC errors on IOPSUSH7 SUSFC1, SUSSQZIN SUSAUXH7, IPC and DK error on SEIH7.

Dave restarted everything ~20 minutes later

TITLE: 02/11 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
    SEI_ENV state: MAINTENANCE
    Wind: 9mph Gusts, 7mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.21 μm/s 
QUICK SUMMARY:

• I saw a few baby elk running together on the LIGO side of route 10 about a half mile before site
• More HAM 1 checks, JAC EOM...
• HAM7 pumpdown continues

I never made updated plots for the lock duration and prevelance of the DARM glitch locklosses for the last couple months of O4c (up to Sept 1st, 2025, up to Oct 1, 2025), so here they are. The performance during October and November mostly line up with what we had been seeing in August and September following the bias change (86027).

Through October and November, the frequency of DARM glitch locklosses, and locklosses in general, was still lower than they had been before the ESD bias change. October went realy well. November wasn't the best month for ETM glitch locklosses - we had 8 locklosses due to ETM glitch during the month. That's only slightly worse than the amount we saw in August right after the bias was doubled, but during November we were locked for less time overall due to O4c ending on November 18th and PEM week not requiring us to keep the IFO locked overnight or on weekends, so that's not the best. However, we still had longer locks on average during November vs before the bias change.

O4 DARM Glitch vs All Locklosses
O4c Lock Length Distribution
O4c Lock Stats

TITLE: 02/05 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY: HAM7 door is on! 
LOG:                                                                                                                                                                                                                                                                                                                                                                                                                                                        

Squeezed in a quick photoshoot of HAM7 (right after ISI-unlocking/measurements by Jim + purge air being turned up and before Door Team sealed it up).  HAM7 was open roughly from 11:16am-11:48amPDT for photos.  Since there was only one door off, lighting wasn't great and limited to shots from the -X side of HAM7.  Used Canon DSLR camera followed by iPhone shots; snapped a handful of macro lens shots for fun.  

Photo Album (109photos) uploaded to Google folder HERE.

TITLE: 02/04 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
    SEI_ENV state: MAINTENANCE
    Wind: 6mph Gusts, 5mph 3min avg
    Primary useism: 0.03 μm/s
    Secondary useism: 0.43 μm/s 
QUICK SUMMARY:

Work continues in chamber

Reminder that the LVEA is LASER SAFE EXCEPT around HAM1/2 and at height.

TITLE: 02/04 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY:  Lots of work towards finishing up in HAM1 and HAM7, including some surfing! LVEA is still LASER SAFE except behind the curtasins by HAM1/2 and at height.
LOG:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              

TITLE: 02/03 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY:
LVEA was Bifircated via a Laser Hazard areas around HAM 1& 2, while the rest of the LVEA is LASER SAFE unless at height. See M2600004 for details.

PM1 was mysteriously dancing & Saturating too much for Rahul's transfer function measurement all day long. While he was troubleshooting. Update!!! Rahul dragged the EE guys out and found a dead Coil Driver! Mystery solved!

JAC work continued all day starting with mode matching in HAM1, and starting a JM2 swap. JAC table now has all the mounts and Cables but no optics yet. 

HAM7 & ITMY ISI Watchdogs tripped at 23:33 UTC due to mysterious high frequency ground noise that was louder at HAM7 than ITMY.  Jim & Betsy went to go look for fallen wrenches or other watchdog tripping phenomena..... No explanation was ever found. 

OPS info: 
New conda ENV doesn't run watchdog untripping scripts unless you run Conda Kill first.  Tagging CDS. 

LOG:

The LVEA is now in a LASER Safe Bifricated configuration, which means that HAM1 is still in LASER HAZARD along with any work done at height.  There are barricades up designating the Bifricated area.

WP: https://services2.ligo-la.caltech.edu/LHO/workpermits/view.php?permit_id=13010
SOP: https://dcc.ligo.org/LIGO-M2600004

The rest of the LVEA is Laser Safe.  So if you are heading into the LVEA, have your laser goggles with you so if you are forced to walk over near HAM1 you'll have your goggle with you.