After the Calibration mesurement this morning, and as I was getting ready to slip H1 back into OBSERVING, noticed some SDF diffs (SEI_DIFF will be noted later).

The odd one was 10^13 diff for an IM2 Yaw offset (see atached).  I know we want to keep an eye on these slider values, so I just ACCEPTed it, but why did this SDF diff appear?  Was it related to the short calibration measurements I ran or purely coincidental?

With LHO closed over the holidays, and O3 still taking place 24/7 over the holidays, Site-Walkthrus have been schedule to be performed by operators during their shifts (DAY).  I performed one this morning per instructions here.  Since inspection of the LVEA, EX VEA, EY VEA are required, these incursions would require us to go out of OBSERVING.  I chose to lump those three inspections together to minimize/optimize time we were out of OBSERVING (where I would take H1 out of OBSERVING, walk through the LVEA, and then drive out to EY & then EX consecutively, AND then finally return H1 to OBSERVING & finish remaining items of the Walk-Through.)

This morning I had H1 down for 35min to run calibration measurements, I was going to tack on VEA incursions to this down time, but we received an Earthquake Alert, so instead, I took H1 to OBSERVING & monitored the EQ in case we needed to transition SEI_CONF to the EARTHQUAKE state (this wasn't needed).  Instead, it was observed the Calibration measurement prossibly affected Calibration Lines.  Took H1 out of Observing, fixed this, and then began VEA incursions.  Here is log:

Duration Total of Site Walk-Thru:  ~90min (18:14 - 19:45utc) 

Duration out of OBSERVING:  ~51min

• 18:10 Out of OBSERVING (first to address PCal Lines & then start Walk-thru)
• Buddy notified
• 18:15-18:28 In LVEA (H1 was in NLN, so I tiptoed!)
  • Heard a faint clicking noise while quietly walking around (appeared to come from the ceiling; I'm guessing this was HVAC-related.)
• 18:30-19:02 VPW, EX, & EY
  • At End Station VEAs, I was reluctant to enter the VEAs since I was worried about disrupting/affecting the BRS systems.  So I only entered and walked a few steps into the VEAs.  Do not see the effects of me entering the VEAs on the BLRMs seismic traces. 
  • Noticed ice build-up on various parts of half of the site Chiller dewars. 
  • EX had a few dead bugs on floor.
• 19:02 Back to OBSERVING!  (then continued with walk-thru of other buildings----I did not enter Mid Stations.)
• For RO Room at the Wood Shop building, heard water dripping, but this is from lines run to a floor drain.
• At LSB, noticed a white Nissan sedan parked in the LSB (person was in car, but no contact was made).
• Needed my FOB to swipe into the LDAS room of the VPW.
• Failed to check the janitor's closet in the Staging Bldg bottom floor.
• 19:45 Back in Control Room (texted buddy & notified LLO/Virgo Control Rooms)

Ice On Liquid Nitrogen Dewars

One item we were asked to check was the exhaust of the LN2 dewars as we drove the site.  I wasn't totally sure where the exhaust was, but eventually figured it out. 

As you inspect the dewars there is frost/ice build up at various points (i.e. input plumbing where Norco connects, output to VEAs, & output exhausts [see attached photos for examples]).  I texted Chandra and she mentioned alot of this is normal, but she said posting photos is good.  Found ice on exhausts at End Stations and LVEA.  Notes:

• At EX I tried to figure out where the exhaust was and I eventually found it, there was a block of ice connected from the exhaust port all the way to the ground---I was able to break this fairly easily. 
• CP2 exhaust had a big chunk of ice.  I was able to break connection to the ground, but was not able to break off the ice frozen to the output pipe.
• While breaking off ice to EY's dewar exhaust, noticed that this output plumbing was not secured.  So it would move like a big pendelum/spring if you touched it.
• DetChar if you see some seismic bumps around these times:  18:55, 19:30, 19:35, this is when I bonked ice chunks off the exhausts...one other instance I don't have time for.

Topped off Crystal Chiller with 125 mL.  Diode Chiller OK.  
Filters look fine (slight yellow tint of Crystal filter [known item]).

Busy morning with:

• Sensor Calibration measurements (~33min), but took some extra time to bring back PCaly Cal Lines
• Transitioned SEI_DIFF back "ON" (to CORNER_DIFF_CPS state)
• Holiday Site Walk-through:  Total of 90min out of the Control Room (and about ~45min out of Observing to inspect the LVEA & end station VEAs).
• Time for lunch!

Yesterday, I was supposed to run some normal & accepted H1 calibration measurements, but unfortunately an EQ changed my plans. 

Today I chose to run these measurements.  Before running the measurements, I wanted to minimize time out of OBSERVING as much as I could, so I got everything set up ahead of time.  I opened up (3) separate DTT sessions with each measurement ready to go (so I can easily run them and also save them while running other ones.  When starting a measurement, I turned on my Timer on my phone so I would get a reminder when it was done.

note:  Attached is a screenshot of my desktop with all three completed measurements.

• 16:53:  STARTED measurements
• 17:26:  COMPLETED measurements
• 17:31:  Back to OBSERVING (delayed, because I turned ON SEI_DIFF & contemplated staying out while I did VEA holiday site walkthroughs, but an EQ was inbound, so decided to hop back into Observing & monitor EQ.

H1 Status: 

• SEI_DIFF is OFF (well, the node is CORNER_DIFF_CPS, but BIT channel is OFF)
• Microseism is fairly high (0.4um/s for 0.1-0.3Hz)

New Measurements files:

• 2019-12-26_H1_DARM_OLGTF_LF_SS_5to1100Hz_15min.xml
• 2019-12-26_H1_PCALY2DARMTF_LF_SS_5t1100Hz_10min.xml
• 2019-12-26_H1_PCALY2DARMTF_BB_3min.xml

Noticed DIAG MAIN message:

"PCAL:  PCAL Y OFS servo malfunction"  Will send a text to Jeff K.

While scanning monitors on the walls, noticed that the 45MHz spectra was above reference from 0.1-20Hz.  (attached is a screenshot, but this was after a few minutes and it began to trend down; currently this spectra is down to the reference for all frequencies.)

This was something which looked odd, so thought I would post a note about it.

TITLE: 12/26 Day Shift: 16:00-00:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Observing at 110Mpc
OUTGOING OPERATOR: Niko
CURRENT ENVIRONMENT:
    SEI_CONF state: WINDY
    Wind: 6mph Gusts, 5mph 5min avg
    Primary useism: 0.04 μm/s
    Secondary useism: 0.51 μm/s

Looks like microseism is slightly beginning a trend down.  Low winds.  No noticeable EQs in last 12+hrs *knock on wood*.
QUICK SUMMARY:

• H1's been locked for 17hrs with a range of about 111Mpc.
• Will try to knock out the sensor calibration measurements this morning.
• Contemplating turning CORNER SEI_DIFF back on to see if this helps with range (perhaps I'll also NOT MONITOR channels from this transition).
• Also need to do a holiday Site Walk-Thru at some point.

TITLE: 12/26 Owl Shift 08:00 – 16:00 (00:00-08:00), all times posted in UTC

STATE of H1: Observing

INCOMING OPERATOR: Corey

SHIFT SUMMARY: Quiet shift, locked and Observing for 16.5 hours.

LOG:

Nothing to report

Ops Shift Transition: 12/26/2019, Owl Shift 08:00–16:00 (00:00-08:00) - UTC (PT)

State of H1: Locked

Intent Bit: Observing

Weather: 0-5 mph wind

Primary 0.03 – 0.1Hz: 0.01 um/s

Secondary 0.1 – 0.3Hz: 0.5 um/s

Outgoing Operator: Jeff

Quick Summary: Locked and Observing for 8.5 hours. Wind is low, microseism high.

   GRB Alert #358439 (599031294) Lat = 36.72 sec, TD = 0.016 sec. Spoke with LLO. INJECT_KILL for 15 minute stand down. 

   The first half of the shift saw a Swift GRB alert and continued earthquake activity. 

   Went into EARTHQUAKE mode for a series a three quakes from the New Caledonia area. Given that microseism remains high and Peak Mon is also elevated, it seemed prudent to make the switch. Rode through these quakes and went back into WINDY. 

   The winds are around 5 to 8 and the fog has cleared somewhat. Range is around 111.5Mpc. 

   00:32 (16:32) GRB Alert #E358420. Lat = 99.62 sec, TD = 1.024sec. All sites are up. In 1 hour stand down. 

HAPPY HOLIDAYS to one and all

TITLE: 12/25 Day Shift: 16:00-00:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Observing at 114Mpc
INCOMING OPERATOR: Jeff
SHIFT SUMMARY:

Nice first half of the shift, and then an EQ made for a rough 2nd half.  Locking was tough after the EQ with many locklosses (no notes in this summary, because they were all submited in the Ops Survey). 

Restored IMs (per Niko + Cheryl IM alog) & this made locking not a problem.

SEI_DIFF prevented Observing, so had to jump through a few hoops to get us back up (see my most recent alog).

Did not get to run Sensor Calibration measurements due to EQ.  Also missed a superevent candidate which rolled in while H1 was down.  :(
LOG:

• 17:39 GRB received, but ignored due to long duration.  
• 20:38 EQ Alert:  5.8 - 6.4 Off of Chilean coast
  • 20:41 SEI_CONF to EARTHQUAKE
• 20:44 Lockloss
• 20:55 SEI_DIFF to DOWN (from CORNER_DIFF_CPS)...
• 21:23 SEI_CONF to WINDY
• 22:05-22:20 IM restoration
• 22:21-22:43 Initial Alignment (w/ no issues)
• 23:37 Back to Observing

After rough going with H1 after the 6.3 Canada EQ from last night (I had many locklosses and issues ranging from not being able to find IR, lots of  Saturations, ASC not being happy, etc.....all was logged to the best of my abilities in the Ops Survey). 

IMs Restored

• Followed suggestion of restoring the IMs (since it looks like HAM ISIs were tripped causing IMs to have alignment shifts....see Niko's alog with input from Cheryl). 
• Ran an alignment after IM restoration.
• Made it to NLN on first attempt with no issues!

SDF Diffs (see 1st attachment)

A few items kept me from immediately going to OBSERVING.  First off were SDF Diffs:

1)  Obviously we had new IM biases:  I accepted these

2) SEI PROC Diffs for CPS Diff stuff from the new SEI_DIFF node:  I accepted these

Then there was a "Not OK" Guardian Node for the Intent Bit related to the (once again) SEI_DIFF....

SEI_DIFF Guardian Node Prevented Observing

Since microseism has been gradually increasing since yesterday, I took SEI DIFF from the CORNER CPS state (NOMINAL State for this node) to the DOWN state while locking earlier today.  Unfortunately, since DOWN isn't the NOMINAL state, this Guardian came up in the list of "NOT OK" Guardian Nodes for the Intent Bit (see 2nd attachment).  I don't know how to change the NOMINAL state, so I intentionally called shenanigans, and:

• Took SEI_DIFF to CORNER_DIFF_CPS (this gave us "OK" guardians)
• Then I did the trick of turning OFF the DIFF_CONTROL_BIT which is the button on the bottom right of the OUTPUT LIMITERS medm (off of ISI_CONFIG medm). 

This then gave me a new list of SDFs for the SEI PROC.  I just went ahead and ACCEPTED these.  (maybe we should Firstly NOT MONITOR all channels related to this new system since this will be a state which changes with weather.  Secondly, we should  add the SEI_DIFF guardian nodeto the "Exclude List" (TJ thought it might have already been added, but it isn't),  since it's NOMINAL state will change from OFF to whatever state (i.e. CORNER_DIFF_CPS) we want when microseism is low.