Lockloss @ 10/15 04:38UTC

We were staying locked through an earthquake but got the DIAG_MAIN message: SERVO_BOARDS: IMC-REFL_SERVO_SPLITMON > 8V at 04:25 and then multiple times and more often in the last few minutes. SRM was constantly saturated in the last minute of the lock. T1 is where DARM_IN1 gave out.

Because ground motion is still very high and we will need to do an initial alignment, I'll be holding us in DOWN for at least ~10mins

We've been Locked for 40 hours now and are Observing at 155Mpc

Quiet night so far. useism is trending up but isn't too bad. Wind has gone up to ~15mph in the last half hour.

TITLE: 10/14 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Observing at 161Mpc
OUTGOING OPERATOR: Ryan C
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 5mph Gusts, 4mph 5min avg
    Primary useism: 0.05 μm/s
    Secondary useism: 0.29 μm/s
QUICK SUMMARY:

In Observing and Locked for 35.5 hours! Everything looking good!

TITLE: 10/14 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Observing at 161Mpc
INCOMING OPERATOR: Oli
SHIFT SUMMARY: The microseism is still rising, winds been very low today, we've been locked for 35:27 as of 23:00UTC.

We dropped observing briefly from me miss clicking something from 18:56:29 - 18:56:47 UTC.

LOG:

No log

We dropped observing briefly from me miss clicking something from 18:56:29 - 18:56:47 UTC.

We've been locked for 31:40, everything looks stable, saturday tours ongoing.

Sat Oct 14 10:05:05 2023 INFO: Fill completed in 5min 1secs

A quick fill, LLCV had just ramped to 100% open.

TITLE: 10/14 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Observing at 163Mpc
OUTGOING OPERATOR: Corey
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 4mph Gusts, 3mph 5min avg
    Primary useism: 0.05 μm/s
    Secondary useism: 0.26 μm/s
QUICK SUMMARY:

• All systems look good, microseim is on the rise a little
• We've been locked for 27:23
• Eclipse viewing party at LExC

TITLE: 10/14 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Observing at 163Mpc
INCOMING OPERATOR: Corey
SHIFT SUMMARY: We have now been Locked for 19.5hours. PSL ISS % diff is low, around 1.9%. Uneventful evening overall, but there is an earthquake from New Zealand heading in soon. The ring heater changes that Camilla made (73445) are still okay and we will hopefully continue to not have any issues with them. I didn't notice any issues with the ETMY coildriver(73442) pop up either.
LOG:

23:00UTC Detector Observing and has been Locked for 11.5 hours

02:28 Earthquake mode activated without warning due to sudden spike in ground motion
02:38 Back to CALM

Observing at 158Mpc

Calm evening and have now been locked for 15hrs 40mins. We entered Earthquake mode from 10/14 02:28-02:38 UTC due to a small local earthquake, but managed to stay locked.

Closes FAMIS#26257, last checked 73321

Corner Station Fans (attachment1)
All fans are looking normal and within range.

• MR_FAN2 was purposefully turned off on Tuesday (73369)
• MR_FAN1 started registering slightly higher noise levels yesterday 10/12 20:21UTC (which lines up with Tyler adjusting the AHU1 flow rate 73416), but the change is minimal

Outbuilding Fans (attachment2)
All fans are looking normal and within range.

[Vicky, Regina, Dorotea, Sheila]

The attached plot shows the ratio of green light transmitted vs reflected through the OPO over the past year to see how green OPO cavity losses have changed.

We last moved the OPO crystal in Nov. 2022 (see relevant alog). Shortly after moving the crystal, the ratio was around 5% and degraded to around 4% within the first week; it has since settled between 2-3% for most of the past year.

We think the discontinuity around 23/04/16 was due to rejecting power away from the refl PD, which was done around that time because the PD was being saturated. If we look at the refl power alone we can see clear saturation occurring on the PD in the time before the power was lowered. We think the loss curve would be fairly continuous if not for the saturation, but can't exactly compensate since we don't know how much power is being lost. The plot shows only times from when the detector was "stable", but stability was calculated fairly naively, leading to some outlier points remaining from when the detector wasn't actually locked; however, the general trend seems pretty consistent.

• 61904 from Feb 24, 2022 was (0.97mW/2.5mW)=3.9%
• 65066 from Sept 22, 2022, was either 0.81/(37-8)=2.8%,  or if we trust the "PDs measured 23mW CLF refl" statement from this alog, then 0.81/23 = 3.5%
• 72604 from Aug 31, 2023 was (0.82mW/27mW)=3.03% 
• We expect to see a 7% loss within this data set, which is difficult to see by eye. A 7% loss degrades the ratio down from 3.9% to ~3.6%.

TITLE: 10/13 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Observing at 160Mpc
INCOMING OPERATOR: Oli
SHIFT SUMMARY: We've been locked all shift, 11:30 as of 23:00

• Dropped out of observing from 16:05 - 17:56 UTC for planned commissioning (PEM, SQZ)
• A small earthquake rolled through around 16:30 UTC
• Dropped observing again briefly for a ring heater change and some quick SQZ checks from 19:03 - 19:08 UTC
• Dropped observing again from 19:33:01 - 19:34:03 UTC for a ETMY R0 test/check
  • It was found that there may be an issue with the ETMY F1 coildriver or the model? Dave's investigating
• There was another small ring heater step that we went out of observing for from 21:06:19 - 21:06:45 UTC

Diag_main has been flashing with "ISS diffracted power is low" message every 10-15 minutes.

LOG:                                                                                                                                                                                                        

TITLE: 10/13 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Observing at 162Mpc
OUTGOING OPERATOR: Ryan C
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 8mph Gusts, 6mph 5min avg
    Primary useism: 0.03 μm/s
    Secondary useism: 0.18 μm/s
QUICK SUMMARY:

Detector is Observing and has been Locked for 11.5 hours. Dust monitors are all good and wind and useism are low.

In order to more easily track and notify on rising violin modes, I've started making a DARM BLRMS monitor around 490-520Hz. This is currently in position #8 in place of Camilla 6600-6800Hz that didn't give expected results (alog73272). It looks like its working, but not the best it could be. Jenne gave me some pointers that I'll try at another time to get this to better show us the violin mode total magnitude. Once it's looking acceptable I'll make others for the harmonics as well.

I used commissioning time today to study the coupling of the CER ACs to DARM (not much progress) and to put in the retroreflector at +Y -X ports of BSC1 and 2 (didnt find any scattering problems).

[Jeff, Robert, Jenne]

Since yesterday's move of the LSC FF actuation from ETMX test mass to ETMY PUM (alog 73420), it has seemed like our 20-30 Hz noise is 'breathing' more than it had been. 

Jeff pointed out that a major change here is, of course, that we are now actuating on a different test mass (which did not previously have any length actuation in low noise), and so there could be scattered light between the test mass and other items in that chamber.  Then, we looked at ETMY's R0, and it looks like it's DAC output is off, which would mean that the R0 length tracking can't be working, which could easily be a source of excess scattered light.  In the attachment, I show that it looks like the ETMY R0 DAC output changed from green to red about 16 days ago.  Again, we've probably never noticed, since we hadn't been using ETMY for any length, so didn't have a need to track anything before today.  Although, it may also mean that the ETMY R0 damping is also not working as expected - I'm not sure how or if we'd expect to see that.

Both ETM RH turned up from 1.0W to 1.1W/segment at 19:03UTC, plan to increase another 0.1W later this afternoon. Follow on from 73437. Will stay in observing during this test.