TITLE: 06/30 Eve Shift: 2300-0800 UTC (1600-0100 PST), all times posted in UTC
STATE of H1: Lock Acquisition
OUTGOING OPERATOR: TJ
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 7mph Gusts, 4mph 5min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.09 μm/s
QUICK SUMMARY: H1 lost lock about an hour ago but is relocking well; so far up to TRANSITION_FROM_ETMX.

• Wind is low, microseism starting to trend upwards
• All other systems nominal

Lockloss1403820932

Ending a 15 hour lock. This lock had the ETMX wiggles as well, but they happened almost a second prior to lock loss and were larger than I have seen.

FAMS26260

Laser Status:
    NPRO output power is 1.821W (nominal ~2W)
    AMP1 output power is 67.15W (nominal ~70W)
    AMP2 output power is 137.3W (nominal 135-140W)
    NPRO watchdog is GREEN
    AMP1 watchdog is GREEN
    AMP2 watchdog is GREEN
    PDWD watchdog is GREEN

PMC:
    It has been locked 32 days, 23 hr 34 minutes
    Reflected power = 22.75W
    Transmitted power = 105.2W
    PowerSum = 127.9W

FSS:
    It has been locked for 0 days 11 hr and 42 min
    TPD[V] = 0.6936V

ISS:
    The diffracted power is around 2.0%
    Last saturation event was 0 days 11 hours and 43 minutes ago

Possible Issues:
    PMC reflected power is high
    FSS TPD is low

Sun Jun 30 10:09:55 2024 INFO: Fill completed in 9min 52secs

TITLE: 06/30 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 151Mpc
OUTGOING OPERATOR: Oli
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 7mph Gusts, 6mph 5min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.07 μm/s
QUICK SUMMARY: Locked for 7.5 hours, noise and range look okay.

TITLE: 06/30 Eve Shift: 2300-0800 UTC (1600-0100 PST), all times posted in UTC
STATE of H1: Observing at 153Mpc
INCOMING OPERATOR: Oli
SHIFT SUMMARY: Three locklosses this shift, all with unknown causes but only two with the ETMX motion before that we've been seeing. Recovery from each was fairly straightforward, however the ALS-X PLL continued to be problematic and unlock when trying to recover from the first lockloss.

• 23:57 - Lockloss - alog78748
  • Having trouble getting past DRMI due to ALS-X PLL repeatedly unlocking
  • 00:51 - Lockloss during TRANSITION_FROM_ETMX, unsure why
• 03:41 - Observing
• 04:15 - Lockloss - alog78751
• 05:13 - Observing; automated relock
• 06:00 - Lockloss - alog78753
• 07:01 - Observing

H1 has been observing for 1 hour.

LOG: No log for this shift.

Lockloss @ 06:00 UTC - link to lockloss tool

Locked for 49 minutes. No obvious cause; larger ETMX motion right before the lockloss this time.

Lockloss @ 04:15 UTC - link to lockloss tool

Locked for 38 minutes. No obvious cause, but I see the familiar small ETMX hit almost a half second before the lockloss.

We lost lock just as I was beginning  HVAC shutdowns to take advantage of the nearly 160 Mpc range. When we regained lock, the range was only about what it was for my last shutdown (77477), so I will defer.  Here are the times for what I did do:

Lockloss @ 23:57 UTC - link to lockloss tool

Ends lock at 6 hours. No obvious cause, and I don't see the ETMX motion prior to this lockloss as we've seen in the past.

TITLE: 06/29 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 152Mpc
INCOMING OPERATOR: Ryan S
SHIFT SUMMARY: One lock loss with a straight forward relock, and then a delayed calibration measurement. We've been locked for 5.5 hours.
LOG:

• 1655 Lock loss
• 2106-2133 Out of observing for coordinated calibration

TITLE: 06/29 Eve Shift: 2300-0800 UTC (1600-0100 PST), all times posted in UTC
STATE of H1: Observing at 154Mpc
OUTGOING OPERATOR: TJ
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 6mph Gusts, 4mph 5min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.06 μm/s
QUICK SUMMARY: H1 has been locked for 5 hours.

• Wind and microseism are low
• All other systems nominal

Calibration sweep taken today at 2106UTC in coordination with LLO and Virgo. This was delayed today since we were'nt thermalized at 1130PT.

Simulines start:

PDT: 2024-06-29 14:11:45.566107 PDT
UTC: 2024-06-29 21:11:45.566107 UTC
GPS: 1403730723.566107

End:

PDT: 2024-06-29 14:33:08.154689 PDT
UTC: 2024-06-29 21:33:08.154689 UTC
GPS: 1403732006.154689
 

I ran into the error below when I first started the simulines script, but it seemed to move on. I'm not sure if this frequently pops up and this is the first time I caught it.

Traceback (most recent call last):
 File "/var/opt/conda/base/envs/cds/lib/python3.10/multiprocessing/process.py", line 314, in _
bootstrap
   self.run()
 File "/var/opt/conda/base/envs/cds/lib/python3.10/multiprocessing/process.py", line 108, in r
un
   self._target(*self._args, **self._kwargs)
 File "/ligo/groups/cal/src/simulines/simulines/simuLines.py", line 427, in generateSignalInje
ction
   SignalInjection(tempObj, [frequency, Amp])
 File "/ligo/groups/cal/src/simulines/simulines/simuLines.py", line 484, in SignalInjection
   drive.start(ramptime=rampUp) #this is blocking, and starts on a GPS second.
 File "/var/opt/conda/base/envs/cds/lib/python3.10/site-packages/awg.py", line 122, in start
   self._get_slot()
 File "/var/opt/conda/base/envs/cds/lib/python3.10/site-packages/awg.py", line 106, in _get_sl
ot
   raise AWGError("can't set channel for " + self.chan)
awg.AWGError: can't set channel for H1:SUS-ETMX_L1_CAL_EXC
 

Andrei, Naoki, Sheila

For the upcoming measurement of the FC backscattering, we need to calibrate the length change of the FC. To do this, we calculated the transfer function from the GS_SL FC control signal [Hz] to FC2 displacement [μm]. We followed the steps in Diagram.png to get to result. The plot bode_all_datasets.png contains all the used datasets.

The resulting transfer function is presented here: Tranfer_func.png (where Result curve is the transfer function). The result was exported to frequency/magnitude/phase dataset and can be found in result_data.txt. The remaining .txt files contain all the used datasets for this calculation.

Assuming that the frequency of the FC resonance shift Δf equal to c/2L corresponds to the FC length change ΔL equal to λ/2. (λ = 532 nm, L = 300 m), then Δf/ΔL = c/(L * λ) = 1.88*10¹²  [Hz/m] = 1.88*10⁶  [Hz/μm]. Multiplying Transfer function by this coefficient will get us the open loop unity gain frequency of 39.4 Hz. Open-loop gain plot (after multiplication) can be found in the following figure: openloop_gain.png.

The long ramp time was confusing me while I was trying to adjust the TMS to speed up locking, so I looked into what needed such a long ramp. I thought it was the TMS servo, but it seems to only use the TEST bank. I couldn't find another place in ISC_LOCK or the ALS guardians that specifically referenced this bank, so I changed it to 2sec like for TMSY and then accepted it in SDF safe and observe. We made it through this acquisition at 2sec so maybe we're OK.

Lockloss 1403715367

There was ground motion from an earthquake just after the lock loss, but the lock loss itself seemed to be quite sudden. ETMX sees those usual wiggles that we often see.

Robert had just started running HVAC shutdown tests, but this seems very unlikely to be the cause.