Sheila, Ibrahim,  Jenne, Vicky, Camilla

After Ibrahim told Sheila that DRMI has been struggling to lock, she checked the POP signals and found that somethings been drifting and POP now appears to be clipping, see POP_A_LF trending down. We use this PD in full lock so don''t want any clipping.

We has similar issues last year that gave us stability issues. These issues last year didn't have "IMC" lock-losses so we think this isn't the main issue we've having now but maybe effecting stability.

Trends showing the POP clipping last year, and now. Last year we moved PR3 to removing this slipping while looking at the coherence between ASC-POP_A_NSUM (one of the QPD on the sled in HAM3) and LSC-POP_A (LSC sensor in HAM1): 74578, 74580, 74581.

Similar coherence plots to 74580, for now are show the coherence is bad:

• It's got worse since July, ca see as step down once we moved PR2 in 78878. Compare Green (July 1st) then Red (July 10th), then Blue (now), plot here.
• It's been bad since the emergency vent recovery in August plot here. 
• The increased coherence seen now <1Hz is the micoseism being elevated.

Sheila is moving the PRC cavity now which is improving POPAIR signals, plot attached is the ASC-POP_A_NSUM to LSC-POP_A coherence with DRMI only locked before and during the move. See improvements. Sheila is checking she's in the best position now.

Ibrahim, Camilla

Over the weekend we had a long ~13 hour lock and 2 days with minimal IMC issues, this was during a time when the microseism was low. Plot attached.  We see similar long locks around Novmeber 6th/7th when the microseism was low, but we always have less issues locking when the micorsiem is low, plot attached.

We checked back to the quiet IMC time shown in 80951, between Oct 11th to 16th, but the microseism was actually relatively elevated during this time. Plot attached.

In both plots, between the t-cursors show quieter IMC glitch times.

FAMIS 31060

Enclosure incursion last Tuesday (alog81247); enclosure temps came back as expected, but power out of AMP2 has been lower by about 1W since then.

PSL Beckhoff was restarted last Thursday (alog81281), which apparently brought the chiller back with a slightly lower flow rate. At this time, there was also a slight jump up in temperature for AMP2, DB2, CB2, and the diode room (?).

PMC reflected power has also been on the rise again, but generally steady for the past ~4 days.

TITLE: 11/18 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Lock Acquisition
OUTGOING OPERATOR: TJ
CURRENT ENVIRONMENT:
    SEI_ENV state: USEISM
    Wind: 15mph Gusts, 11mph 3min avg
    Primary useism: 0.04 μm/s
    Secondary useism: 0.58 μm/s
QUICK SUMMARY:

IFO is LOCKING at ACQUIRE DRMI

When I arrived, IFO had just found PRMI. It seems this is the first lock acquisition since an auto-initial alignment following the last lockloss at 14:23 UTC. Microseism is high and increasing.

The IFO timed out after a long period of IMC locking struggles, then it got stuck trying to lock ALSY during initial alignment. I minor tweak to ETMY fixed the latter issue, but then SRM tripped during the SRC alignment step. I adjusted SRM to fix this. We then made it up to just after the power up before losing lock again (141596598, IMC tag).

I'll let it try a few more times by itself before stepping in again.

TITLE: 11/18 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Lock Acquisition
OUTGOING OPERATOR: Ibrahim
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 20mph Gusts, 13mph 3min avg
    Primary useism: 0.05 μm/s
    Secondary useism: 0.42 μm/s
QUICK SUMMARY:

I ran an Initial_Alignment early on and had the IMC unlock during the SRC_ ALIGN Section. The asc signals looked real strange, so I turned off the ISS and did a Manual_Initial_Alignment.

but....

Between the increasing Sencondary microSeism , the 30-40+  mph wind gusts, and the IMC issues have made locking for the past 2 shifts very diffucult.
I tried using the SEI_CONF MORE_WINDY early on to see if I could get locked. But as the rising micro seism made this increasingly less like to be successful.
I held in IDLE for an hour waiting for the wind to get below the 30 mph mark and tried to lock a number of times.  Getting no Futher than LOWNOISE_ESD_ETMX

I took some time to do another Initial Alignment, and didn't get H1all the way locked.

So , Good luck to TJ and H1 Manni.

TITLE: 11/18 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Wind
OUTGOING OPERATOR: Ibrahim
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 29mph Gusts, 18mph 3min avg
    Primary useism: 0.06 μm/s
    Secondary useism: 0.44 μm/s
QUICK SUMMARY:
45 MPH wind gusts are present.
I'll be trying to lock it a few times just incase I get lucky with a break in the wind. 
IMC Has been unlocking as well. I turned off the ISS again to get some more stability from the IMC. I'm not sure if this actually works or not.
I'm also taking the SEI_CONF to MORE_WINDY, to see if that also helps.

Wish me luck!

TITLE: 11/18 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Wind
INCOMING OPERATOR: Tony
SHIFT SUMMARY:

IFO is DOWN due to ENVIRONMENT

Very rough shift with 0 time spent locked. Today, this was mostly due to 3 reasons.

1. Environment:

• Wind gusts are currently 40 mph, mostly above 30 mph for the whole day. There were a few gusts above 50 mph with a couple above 60mph (with one at 62 mph, the highest I've seen).
• Secondary microseism is back over the 90% threshold for microseism. This is the main reason we were unable to lock during the shift.

2. IMC: The IMC glitch has dominated our locking attempts during lulls in the wind speed. It occured during initial alignment as well as during normal locking multiple times. This occured a few times after we had already locked DRMI under such windy conditions and so getting back to DRMI was either glitchy or windy and only happened twice today. The glitch has happened during all non-windy lock acquisitions.

3. Fast Shutter Error: At 20:01, we were at CHECK_AS_SHUTTERS during a lull in wind speed when we lost lock. After this locklossm the HAM6 SHUTTER status alert went red and guardian warned me not to power up. After calling a couple of people, Keita was able to diagnose the issue as a code threshold error. I went into the fast shutter guardian and changed the threshold of PdBDarkLo from -15 to -40 and PdBDarkHi from 15 to 40. More background and info is available in Keita's comment to my midshift alog 81320. This took 1hr 43 mins to diagnose and solve.

A calibration sweep has not been done yet (since Saturday). If at all we are able to get locked let alone thermalized that, Tony will do it.

LOG:

None

Closes FAMIS 26318, Last checked in alog 81105

Laser Status:
    NPRO output power is 1.909W (nominal ~2W)
    AMP1 output power is 68.55W (nominal ~70W)
    AMP2 output power is 137.8W (nominal 135-140W)
    NPRO watchdog is GREEN
    AMP1 watchdog is GREEN
    AMP2 watchdog is GREEN
    PDWD watchdog is GREEN

PMC:
    It has been locked 0 days, 21 hr 38 minutes
    Reflected power = 18.21W
    Transmitted power = 107.2W
    PowerSum = 125.4W

FSS:
    It has been locked for 0 days 0 hr and 18 min
    TPD[V] = 0.8546V

ISS:
    The diffracted power is around 4.0%
    Last saturation event was 0 days 0 hours and 0 minutes ago

Possible Issues:
    PMC reflected power is high - this is new from last week's report.
    ISS diffracted power is high

We had a lull in the heavy winds during which I was able to get an initial alignment in and then up to DRMI locked.

The wind is now back up to the 30s mph and the IMC glitch is happening quite frequently (both on the rocky start-up to DRMI and thereafter).

Thus, I will be staying in DOWN until conditions improve.

Meanwhile, the HAM6 SHUTTER red alert came on with guardian telling me not to power up due to SHUTTER_FAILURE. I am investigating this.

Sun Nov 17 10:10:23 2024 INFO: Fill completed in 10min 20secs

TITLE: 11/17 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Wind
OUTGOING OPERATOR: TJ
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 44mph Gusts, 33mph 3min avg
    Primary useism: 0.12 μm/s
    Secondary useism: 0.32 μm/s
QUICK SUMMARY:

IFO is IDLE due to ENVIRONMENT.

In the last hour since TJ's OWL alog, the wind has not died down, and the microseism has only gone up.

With 50mph gusts, we are unable to lock. Will stay in idle until we can re-attempt lock.

On the bright side, the IMC is locked.

The IMC has been struggling to stay locked for the last few hours, interrupting locking and restarting the process. Ground motion has also not been kind with a 6.1M earthquake from Japan a few hours ago, and useism and wind on the rise. Since the wind is getting over 40mph gusts, I'm switching the Observatory Mode to Environment - Windy.

TITLE: 11/17 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Lock Acquisition
INCOMING OPERATOR: TJ
SHIFT SUMMARY:

3:01 UTC GRB-Short E 525935 We were not locked for the begining of this stand down event.

2024-11-17 3:27:53 NOMINAL_LOW_NOISE reached
3:30:27 OBSERVING reached

Violin ITMY Mode 5 is still rising on this lock.
I changed the Gain to 0 and waited 15 minutes to see if it will stop going up or even turn around.
I then tried about 3 minutes with the gain at -0.02 ( Nominal gain just negative) but it was obvious that the no gain is better than opposite gain.
I ended up just turnin goff the gain.

05:11 UTC Lockloss https://ldas-jobs.ligo-wa.caltech.edu/~lockloss/index.cgi?event=1415855535
This was a very fast lockloss , it doesn't look like the same IMC /FSS locklosses we have been seening. But the PSL-FSS_FAST_MON_OUT_DQ was still the first signal to change behavior.

Relocking notes:

Relocking has been made very difficult with the IMC constantly unlocking. Most of the Locklosses are in locking Green arms, but everyfew attempts it gets a little further like DRMI, then the IMC stops working again.
I tried turning the ISS off again, but it hasn't stopped it from unlocking the IMC.
I turned back on the ISS so  just in case H1 manager gets to about ISC_LOCK state 500 it will auto lock for him.

I couldn't get Past DRMI 1f, and ended up in a PRMI & Check Mich loop.

I tried to do an Intial_Alignment, But IMC would not stay locked for long enough.
I eventually waited for the IMC to lock then turned off the ISS Auto Locker for the duration of the Initial alignment.

Initial alignment went well with the ISS turnt off.
Trying to relock again.

TITLE: 11/17 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 159Mpc
OUTGOING OPERATOR: Ibrahim
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 15mph Gusts, 11mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.24 μm/s
QUICK SUMMARY:

H1 Has been locked for 1 Hour and 45 minutes.
DCPD's are diverging, Which I usually attribute to the Violins growing.
Turns out it's one of the usual suspects..... ITMY Mode 5 increasing.

I have turned the Gain off of ITMY m5 to see if it stays at that level or decreases.

The IFO stays locked until 1:25 UTC then I can do a Calibration sweep are the calibration time early today was missed by a lockloss.

TITLE: 11/16 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 157Mpc
INCOMING OPERATOR: Tony
SHIFT SUMMARY:

IFO is in NLN and OBSERVING as of 22:35 UTC

There was one IMC-caused Lockloss which ended our 13hr and 36 min lock acquisition. (alog 81310)

Stayed locked for the majority of this shift with one somewhat troublesome lock acquisiton for a number of reasons:

• ALSX was stuck at 0.15 cts, with a max of 0.3 cts after intervension. I went into manual initial alignment to continue troubleshooting. Jenne advised to touch ITMX, which worked. I was able to get ALSX to the normal ~0.8cts and let guardian successfully take it from there. Initial alignment happened fully auto.
• We were able to lock up until OFFLOAD_DRMI_ASC until a lockloss occured due to the IMC glitch. The IMC was still coming in and out, locking and unlocking for 4 more minutes.
• We were able to get all the way up to LOWNOISE_ESD_ETMX, before losing lock again.
• IFO was able to lock to NLN on the third and final try.

I was not able to take a calibration measurement due to the Lockloss, and we're not thermalized yet. I've informed Tony, the EVE operator, and he will take a calibration sweep once thermalized (01:24 UTC).

LOG:

None

Lockloss seemingly caused due to the IMC with MC2 losing lock within 1ms of ASC (attached).