TITLE: 06/21 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Lock Acquisition
INCOMING OPERATOR: RyanS
SHIFT SUMMARY:

H1 had a fairly straightforward time.  Needed an alignment to get it back to NLN both times.  Highlight of the afternoon was (3) gravitational wave candidates in less than 3hrs!
LOG:

• (1333) Lockloss & an hour of locking to no avail.
• 1435 Initial Alignment
• 1445 Reran launch script for nuc33 (for sqz dtt which was successful) and nuc5 (for dmt viewer which was not successful)
• 1503-1609 Dust Monitor FAMIS checks for EX.EY.LVEA (mitch)
• 1546-1613 Optics/Vac Prep clean (karen)
• 1550 OBSERVING (Overnight, h1 did run through an alignment at 1400, but it did not take.  So I ran one at beginning of shift and it was straightforward, DRMI was taking close to 5min, so went to PRMI, --BUT-- wouldn't ya know it, DRMI locked right after I selected PRMI! Other than that Locking was easy.
  • Forgot to note the alignment via Observatory Mode :(
  • NOTE:  Sheila made a comment about the Squeezer not looking great at beginning of lock (high frequency looked higher to her than normal during this thermalization phase); will revisit in a few hours.
• 1600 PCal work (francisco)
• 1629-2205 Continuing EX chiller work (tyler & MacMiller contractor)
• 1629-1800-ish Glycol make-up/add at every out building (tyler, eric)
• 1637 Lockloss & taken immediately to Initial Alignment (thanks, Oli! And selected ALIGNING for OBSERVATORY MODE)
  • 1752 back to OBSERVING
• 1730-1750 Fit & Over 50 Tour (kim)
• 1736 OM2 test by Sheila for an early measurement to be run on an early morning over the weekend.
• 1753 tcs laser work in optics lab (camilla)
• 1756-1832 sqz work in optics lab (karmeng)
• 1951 SuperEvent S240621dy
• 2008 Continuing sqz work in optics lab (karmeng)
• 2009 SuperEvent S240621eb
• 2012-2033 WSU-Pullman REU tour (maggie)
• 2141 SuperEvent S240621em
• 2149-2245 More tcs laser work in optics lab (camilla)
• 2307 Grabbing PCal equip (francisco)

[Andrei, Erik]

Andrei's script to create a spectrogram of these channels

H1:IOP-LSC0_MADC5_TP_CH8

H1:SQZ-FC_LSC_DOF2_OUT_DQ

Every ten minutes is now running. 

The script and its outputs are in /ligo/gitcommon/FC

Output is retained for 28 days.

The script is running on cdsvmscript1.

To turn it off, log in as root, then run

systemctl stop filter_cavity_spectrogram

systemctl disable filter_cavity_spectrogram

To turn it back on,

systemctl start filter_cavity_spectrogram

systemctl enable filter_cavity_spectrogram

TITLE: 06/21 Eve Shift: 2300-0800 UTC (1600-0100 PST), all times posted in UTC
STATE of H1: Observing at 150Mpc
OUTGOING OPERATOR: Corey
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 14mph Gusts, 9mph 5min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.05 μm/s
QUICK SUMMARY: H1 has been locked and observing for just over 5 hours.

• Wind and microseism are low
• All other systems nominal

Ryan C, M Robinson, R Kumar

Given below is the summary of work done in the triples lab in the last two months regarding assembly of A+ HRTS suspension for O5 (refer to alog 76635 which gives the details about the first assembly in March 2024- assembly s/n 02). We have assembled four new suspensions (assembly s/n 03, 08, 01, 11), which brings the total number of assembled (with BOSEMs) and characterized suspension in the lab to five. All five assembly till now has been for the FREESTANDING version (only the base differs- which is as per D1900287).

In this round of assembly and testing procedure of HRTS we have made two new improvements as listed below,

1. Class B PEEK wire install tool (top mass to PUM - as shown in the picture attached) - This new PEEK part has been designed by the RAL team after we had wire breaking issues in the first round of assembly. Using this new tool we can safely and quickly install the wires between top mass and PUM outside the cage on the optical bench.

2. Vibration Isolation set up as shown in view01 and view02 - While running transfer function measurements, the HRTS suspension was strongly coupling-in with the lab/building environment (ground vibrations, doors, HVAC etc). To partially isolate the SUS, we now have an optical bench (12in by 18in, Thorlabs Nexus Breadboard) sitting on a 1inch thick viton pads (placed at the four corners of the bench). Also, Chris fabricated a hard top transparent cover for us to protect against the turbulent air flow in the lab.

Cage S/N 03 (April 2024)

Suspended masses (as per specifications):-

Top Mass = 749gm, Penultimate mass = 803gm, Dummy optic = 300gm

Transfer function measurements for HRTS assembly S/N 03 is attached here.

Cage S/N 08 (April 2024)

Suspended masses (as per specifications):-

Top Mass = 755gm, Penultimate mass = 803gm, Dummy optic = 301gm

Transfer function measurements for HRTS assembly S/N 08 is attached here.

Cage S/N 01 (May 2024)

Suspended masses (as per specifications):-

Top Mass = 752gm, Penultimate mass = 804gm, Dummy optic = 300gm

Transfer function measurements for HRTS assembly S/N 01 is attached here.

Cage S/N 11 (May 2024)

Suspended masses (as per specifications):-

Top Mass = 750gm, Penultimate mass = 803gm, Dummy optic = 301gm

Transfer function measurements for HRTS assembly S/N 11 is currently under processing and the latest plots will be attached soon.

Conclusions: - The transfer function measurements ties-up nicely to the model, however we do see some low frequency coupling and unwanted peaks. The cross coupling and unwanted peaks are due to environmental noise which is difficult to fully isolate in the lab.

I will also post a plot comparing the transfer function measurement results for all five suspension that we have tested.

I've set up a script to start heating up om2 TSAMS at 5:30 on Monday morning, so that it will be thermalized in time for our 8:30 pacific commissoning time. 

The script is at /ligo/gitcommon/labutils/beam_spot_raster/om2_stepper.py

It is running on cdsws39:

sheila.dwyer@cdsws39:/ligo/gitcommon/labutils/beam_spot_raster$ tconvert 1403267418 -l
Jun 24 2024 05:30:00 PDT
sheila.dwyer@cdsws39:/ligo/gitcommon/labutils/beam_spot_raster$ python om2_stepper.py -s 1403267418
Waiting for start time...

Fri Jun 21 10:08:00 2024 INFO: Fill completed in 7min 57secs

Gerardo confirmed a good fill curbside.

Attached are darm spectra, with times choosen to be higher range times for each configuration.  The first comparison shows O4a  with OM2 hot vs cold, once the feedforward was retuned well with OM2 hot there was an improvement at low frequency but the high frequency was slightly worse, so that the BNS range is similar between the two configurations O4a hot vs cold OM2

In the break, improvements in the DARM offloading and other low frqeuency improvements meant that the low frequency noise floor is lower.  O4a vs Ob4 compare.  This also means that we have been more aware of the ASC and LSC coherences changing at low frequency and impacting our range.  The second screenshot shows the O4a times compared to two O4b times, both with OM2 cold but before and after the output arm change on April 22nd. 

Since we saw a change in low frequency sensitivity back in December with hot OM2, it would be interesting to try this test again soon. 

Had an SDF Diff for "ETMX_L3_DRIVEALIGN_L2L_GAIN"  (now 187.3792660000, was 187.3792260000); looks like this change is from work yesterday (alog 78555, and also screenshot).  ACCEPTED new gain.

For FAMIS 26256:
Laser Status:
    NPRO output power is 1.82W (nominal ~2W)
    AMP1 output power is 66.36W (nominal ~70W)
    AMP2 output power is 136.8W (nominal 135-140W)
    NPRO watchdog is GREEN
    AMP1 watchdog is GREEN
    AMP2 watchdog is GREEN
    PDWD watchdog is GREEN

PMC:
    It has been locked 23 days, 21 hr 21 minutes
    Reflected power = 21.88W
    Transmitted power = 106.1W
    PowerSum = 127.9W

FSS:
    It has been locked for 0 days 0 hr and 49 min
    TPD[V] = 0.8574V

ISS:
    The diffracted power is around 2.0%
    Last saturation event was 0 days 0 hours and 49 minutes ago

Possible Issues:
    PMC reflected power is high

TITLE: 06/21 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Lock Acquisition
OUTGOING OPERATOR: Ibrahim
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 5mph Gusts, 4mph 5min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.05 μm/s
QUICK SUMMARY:

H1 lost lock an hour ago (after an almost 15hr lock), and has had no luck locking, so immediately starting an Intial Alignment (this is the norm as of late for the last ~month).

Arrived to DustMon alarm in the Labs (but it had already passed.  Winds are calm.  Looks like the seismic DMT viewer on nuc5 is really dead or quiet.  nuc33 also doesn't have the SQZ DTT (seems to also have been happening a bit lately).

TITLE: 06/21 Eve Shift: 2300-0800 UTC (1600-0100 PST), all times posted in UTC
STATE of H1: Observing at 153Mpc
INCOMING OPERATOR: Ibrahim
SHIFT SUMMARY: We stayed locked the whole shift, I noticed EY PEM rack2 was getting pretty hot? It's usually hot though?
LOG:

06/20 22:50 UTC Observing

The range has been hovering just under 160Mpc for the past few hours.

We've been locked for 4:25, in observing since 6/20/24 22:50 UTC.

J. Freed, J. Kissel

Today we did damping loop injections on all 6 BOSEMs on the ITMY. This is a continuation of the work we did previously for ITMX.

Due to a saving error, the background measurments were taken about an hour and a half after the data was collected. Leading to the results being more difficult to interpret. We also only put the gain at 600 this time when before it was at 750.

The plots, code, and flagged frequencies are located at /ligo/home/joshua.freed/20240620/Scrpts. While the diaggui files are at /ligo/home/joshua.freed/20240620/Data

TITLE: 06/20 Eve Shift: 2300-0800 UTC (1600-0100 PST), all times posted in UTC
STATE of H1: Observing at 147Mpc
OUTGOING OPERATOR: TJ
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 14mph Gusts, 10mph 5min avg
    Primary useism: 0.03 μm/s
    Secondary useism: 0.05 μm/s
QUICK SUMMARY:

• We've been locked for an hour
• The wind is moderate

WP11927

The offload of the past 6 months of raw minute trend data from h1daqtw0 to h1ldasgw0 completed this afternoon.

The file copy ran from Tue 09:39- Wed 11:24

The old files deletion ran Thu 10:23 - 12:37

NDS0 was restarted at the beginning and end of the process: Tue 08:34 and Thu 09:21.

TITLE: 06/20 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 146Mpc
INCOMING OPERATOR: Ryan C
SHIFT SUMMARY: One lock loss and some commissioning time today. Relock was automated with an initial alignment.
LOG:

• 1500 Out of Observing for calibration
• 1501-1515 EX chiller pumps getting turned on and off
• 1905 Observing
• 2119 Lock loss
• 2250 Observing                                                                                                                                                                                                                                         

Added a beamsplitter and photodetector at the input of the SHG cavity to measure the escape efficiency.

The reflected beam from the SHG (blue trace) gives an escape efficiency of 98.1%. The theoretical escape efficiency of the SHG is 98.5% for mirror reflectivity of 90% and 99.85%.

The escape efficiency is calculated via P_trans/P_refl = (2n_esc - 1)². From the reflected beam, the P_trans/P_refl = 3.19/3.45.

The escape efficiency calculated from the mirror transmissivity is, n_esc = T_input / T_total = 0.985