TITLE: 03/18 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 149Mpc
INCOMING OPERATOR: Oli
SHIFT SUMMARY: Extremely quiet shift with H1 observing throughout and has been locked for just over 10 hours. Range slightly lower this lock due to different SQZ angle?

TITLE: 03/17 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 151Mpc
INCOMING OPERATOR: Ryan S
SHIFT SUMMARY: I restarted standdown_alerts around ~15:30 UTC this morning after it died overnight, igwn_alert died with the network issues (GraceDB error) and I restarted that around 18:30 UTC. Yellow dust alarms in the optics lab throughout the day.
LOG:

• 17:09 UTC lockloss from a ground motion spike
  • The wind picked up which made ALS a bit unstable
  • 17:45 UTC I held at DRMI_LOCKED and adjusted SR2 and SRM by hand to improve the alignment and Sheila went out to measure the POP power
  • 18:20 UTC Network issues
  • 18:52 UTC Observing
    • SQZ reports pump fiber rejected power is high (tagging SQZ)

CAL sweep ESD Observations:
While checking the ESDs for saturations during the CAL Sweeps I found this signal shape during a CAL Sweep that we survived.
I can see there are different sections to the CAL sweep, and we tend to lose lock on this last section which is a 1200Hz signal.
While zooming in we can see a 40Hz oscillation that is ontop of the 1200hz injection.

There are multiple Locklosses in this section of the CAL Sweep, but there seems to be a common 40ish Hz oscillation on top of the 1200Hz that apears when we loose lock, But not when we survive it.

I am aware that there is an alog 82827 that mentions a 43.75 hz signal... which may need to be look into as the source of this oscillation.

Perhaps I should try to figure out what frequencies are being injected during the CAL sweeps.

TITLE: 03/17 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 148Mpc
OUTGOING OPERATOR: Ryan C
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 10mph Gusts, 4mph 3min avg
    Primary useism: 0.03 μm/s
    Secondary useism: 0.22 μm/s
QUICK SUMMARY: H1 has been locked and observing for just over 4 hours.

• Wind moderately low, microseism falling and currently around 70th percentile
• All other systems nominal

Sheila, Elenna

This morning while we were relocking I did a repeat of the POP air power measurements with 2W input power into the IFO, similar to what was done in 82942, this time the powers are rather different and are closer to expectations for HAM1 powers (with settings on the power meter verified).

• See photo of this path: 82751  After the 90/10 BS I measured 1.6mW, right before POP X I measured 0.83mW, and 0.22mW on the pop AIR B path.  (I am sure that the power meter was set correctly for the wavelength and filter state).
• The attached screenshot shows a time series of when I was making measurements, you can tell which measurement happened when by looking at the time each beam was blocked. 
• POP_A_LF is calibrated into uW on the POP in vac diode 13905 (1055uW at this time), while POP_A_LP is calibrated into Watts in the PRC based on input power, PRG (82656).

Implied power in the PRC at 2W input power time:

• input power 1.86W * PRG of 53 =  98.6W
• power meter in popair path = 1.6mW *(1/ 0.1)*(1/(1-0.054))*(1/229e-6) = 73.9 W
• power on POP A LF = 1054uW*(1 /0.054)*(1/229e-6) = 85.2W

FAMIS 31077

Nothing much to report this week; trends are looking stable.

J. Kissel

I attach updated figures from the SPI Conceptual Design Document (G2301177) slides on the the expected performance of the SPI w.r.t. the HAM2-HAM3 ISI system for the purposes of the Final Design Document (T2400145). These "final answer" figures are attached as .pngs, attached in L, P, Y order. For posterity I attach a .pdf which shows the entire plot series from the code (${SeiSVN}/seismic/Common/SPI/Scripts/plot_spi_motivation_20250314.m).

"The code" is an updated version of that from LHO:70306. Really, the only updates are to use the modern version of each of the SPI's DOF's noise budget, most recently documented in LHO:12273. Please revisit LHO:70306 if you'd like to understand the estimate of the ISI platforms; that has not changed at all, as we have not made substantial performance improvements to the HAM2 - HAM3 ISIs since (remember, O4 started in June 2023 and is on-going today.)

DISCUSSION
A brief bit of discussion about the changes in SPI noise budget:

SPI LONG: (See first .png, or page 20 of the .pdf plot series)
The modern modeled SPI longitudinal IFO performance is worse below 0.5 Hz, where the model now includes a real estimate of the frequency noise of its laser source -- which is now the PSL (with frequency noise from LHO:73976) rather than what was proposed in the conceptual design phase; an independent laser source with (0.01 * free-running NPRO frequency noise) = 1 [Hz/rtHz] * (100 [Hz] / f). For that same reason, it's better above 0.5 Hz, and the limit is instead the next noisiest source in the modern design -- ADC noise.

SPI PIT/YAW: (See second .png and third .png or pages 9 and 15 of the .pdf plot series)
The modern modeled SPI Pitch / Yaw optical lever performance is split into two curves:
    - one for spot size of 5 mm at the "reflector" ISI (i.e. the spot size at "ISIJ," which is HAM2 in this pathfinder instantiation, after having diverged over the ~16 [m] traverse and measured by "QPDA"), and
    - one for spot size of 1 mm at the "transceiver" ISI (i.e. the spot size at "ISIK," which is HAM3 in this pathfinder instantiation, after having been refocused to the original transmitted size by the ~16 [m] ROC reflector on HAM2 and measured by "QPDB" on the HAM3 transceiver.)

The CDD's model did not account for the spot size increase, so it was essentially the 1 mm spot size model. The changes in 1 mm spot size model from CDD to FDD are (1) an updated [whitened] ADC noise curve, showing an improvement below 0.3 Hz, and (2) the addition of an estimate for the shot noise on the QPD, which makes the >30 Hz performance slightly worse.

Both the 1 mm and 5 mm modern estimates are limited by ADC noise across the entire frequency band.

CONCLUSION
My interpretation of the plots -- regardless of these changes to each DOF of the expected SPI performance, comparing these against the estimate of the June 2023 performance of the HAM2-HAM3 ISI system, the conclusions from the conceptual design remain: we still expect the pathfinder to provide a range of "interesting" (YAW) to "delightful" (PIT, LONG) amount of improvement to the system; more-so in some regions and less in others. We look forward to making these plots with a real measured system rather than a model!!

17:08 EQ mode activated, nothing on USGS or EMSC so it might have been some local event?

17:09 UTC lockloss

Last week CDS tried to switch all the remaining cameras to the new camera server with new code (alog83308). We ended up reverting this change since it introduced an offset into the cameras that we use in full lock - BS, ETMs. We switch over to these cameras in the ADS_TO_CAMERAS state, as one of the last things we do before low noise.

Sheila's idea to implement these new camera offsets introduced by the new code is to switch to the new server after we get to almost full lock, and then account for these offsets to bring us back to our previous position. In order to for this to work, the position of the camera inputs would need to be consistent lock to lock, otherwise we run the risk of adding in a manual offset to an odd place from that particular lock. Looking back at the last week or so, we are very consistent before we switch to the camera servo (attachment1 as example). Next steps are to coordinate with CDS to try this during the tail end of maintenance day or another opportunity.

Mon Mar 17 10:12:55 2025 INFO: Fill completed in 12min 52secs

Gerardo confirmed a good fill curbside.

Mayank, Sheila, Camilla

After the adjustments to the ADF SQZ phase servo 83381, we had some issues will it railing at the start of the lock, so it was turned off 83393.

Today Sheila re-cabled the phase at the SQZ racks so that we're now using RF3 rather than RF6. The expectation is that the ADF phases we set are changing with thermalization and RF3 should have the ADF I and Q signals centered on zero with no offsets.  The SQZ angle is still controlled via the same RF6 medm channels but its really adjusting the 3MHz.  

• Inital cabling (using RF6): 
  • 25-2 goes from 6 MHZ to CLF phase shifter
  • 30-2 goes from 3 MHz right to LO demod (with extra cable length)
  • 215 goes from phase shifter chain to CLF demod
• Final cabling (using RF3): 
  • 25-2 now goes from 6MHz to CLF demod
  • 30-2 now goes from 3MHz to phase shifter
  • 215 now goes from phase shifter chain to LO demod
• Photos attached

After this we turned off the H1:SQZ-ADF_OMC_TRANS_DEMOD_{I,Q}_OFFSET and put H1:SQZ-ADF_OMC_TRANS_Q_NORM back from 4.5 to 1. Then we scanned the SQZ angle with ezcastep H1:SQZ-CLF_REFL_RF6_PHASE_DELAYSTEP -s 15 '+74,28' and H1:SQZ-CLF_SERVO_IN2POL sign NEGATIVE to get a new data set to fit to. For good SQZ, CLF sign left at negative with SQZ angle at 185deg.

TITLE: 03/17 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 151Mpc
OUTGOING OPERATOR: Corey
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 3mph Gusts, 2mph 3min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.25 μm/s
QUICK SUMMARY:

• We've been locked for almost 3 hours
• Low wind, secondary microseism is decreasing
• EX vac yellow alarm for EX_X2_PT524B_PRESS
• Optics lab seeing some dust counts, max of ~350

TITLE: 03/17 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 152Mpc
INCOMING OPERATOR: Corey
SHIFT SUMMARY: Very quiet shift with H1 observing since getting relocked. Currently have been locked for 4.5 hours.

• 23:37 - Alignment finished, starting lock acquisition
• 00:30 - Observing

TITLE: 03/16 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Lock Acquisition
INCOMING OPERATOR: Ryan S
SHIFT SUMMARY:

IFO is LOCKING in INITIAL_ALIGNMENT

An extremely calm shift in which H1 was locked for 9 hours today with one lockloss (cause yet known). Lockloss alog 83401.

I also ran a calibration sweep (alog 83397) since we didn't get to run one yesterday, testing out the new sweep script on the Calibration Measurement Wiki.

LOG:

Lockloss @ 23:06 UTC - link to lockloss tool

No obvious cause, and no real sign of an ETM glitch that I can see either. Starting an initial alignment now.

TITLE: 03/16 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 150Mpc
OUTGOING OPERATOR: Ibrahim
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 13mph Gusts, 7mph 3min avg
    Primary useism: 0.03 μm/s
    Secondary useism: 0.41 μm/s
QUICK SUMMARY: H1 has been locked for 9 hours. Calibration sweep was run earlier today, but otherwise sounds like it's been quiet.

• Wind is low, microseism steady just below 95th percentile
• All other systems nominal

Closes FAMIS 26373. Last Checked in Alog 83229

Laser Status:
    NPRO output power is 1.845W
    AMP1 output power is 70.39W
    AMP2 output power is 140.3W
    NPRO watchdog is GREEN
    AMP1 watchdog is GREEN
    AMP2 watchdog is GREEN
    PDWD watchdog is GREEN

PMC:
    It has been locked 40 days, 2 hr 27 minutes
    Reflected power = 22.39W
    Transmitted power = 106.6W
    PowerSum = 129.0W

FSS:
    It has been locked for 0 days 9 hr and 26 min
    TPD[V] = 0.8039V

ISS:
    The diffracted power is around 3.5%
    Last saturation event was 0 days 10 hours and 2 minutes ago

Possible Issues: None reported