A rather short lock, no immediate cause. This lock loss (1403628990) did NOT see the DARM wiggle that we have been seeing frequently, but rather it looks like all of the quads start to move before DARM.

After a night of earthquakes, we are back to Observing. Fully auto from me after I requested an initial alignment.

TITLE: 06/28 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Earthquake
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 2mph Gusts, 1mph 5min avg
    Primary useism: 0.05 μm/s
    Secondary useism: 0.06 μm/s
QUICK SUMMARY: Ground just getting calm after the 5.7 Tonga earthquake, which followed a 7.0 from Peru. I'll start initial alingment now.

TITLE: 06/28 Eve Shift: 2300-0800 UTC (1600-0100 PST), all times posted in UTC
STATE of H1: Earthquake
INCOMING OPERATOR: Ibrahim
CURRENT ENVIRONMENT:
    SEI_ENV state: EARTHQUAKE
    Wind: 13mph Gusts, 10mph 5min avg
    Primary useism: 0.46 μm/s
    Secondary useism: 0.06 μm/s
SHIFT SUMMARY:
H1 was locked for 6 + hours before a 7.2 Mag eathquake unlocked the IFO.
When the 7.2 Mag quake hit the ITMY ISI's tripped.  I was able to simply untrip them with out any issue.
Ive been sitting in Idle for a while and it seems like the IFO needs more time to allow the shaking to stop.

ISC_Lock is currently in Initial_alignment.

LOG:

 

TITLE: 06/28 Eve Shift: 2300-0800 UTC (1600-0100 PST), all times posted in UTC
STATE of H1: Earthquake
CURRENT ENVIRONMENT:
    SEI_ENV state: EARTHQUAKE
    Wind: 23mph Gusts, 18mph 5min avg
    Primary useism: 0.95 μm/s
    Secondary useism: 0.48 μm/s
QUICK SUMMARY:

Incoming Earthquake 7.0 mag from Peru.
Lockloss at 5:48 UTC ended the 6 hour 45 minute lock we had.
Holding in ISC_Lock in IDLE  for a while.

Repeat the same measurement (as 78686) on SHG1, all the phase matching curve was measured in cavity.

The measurement was done twice, the mode matching was 85% for the first measurement and 93% for the second measurement. The alignment optimization does not affect the curve.

Next: remove one of the cavity mirror and measure the phase matching curve in single pass setup.

TITLE: 06/27 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 150Mpc
INCOMING OPERATOR: Tony
SHIFT SUMMARY: Currently Observing and have been Locked for 21 minutes. Lots of issues with ALSX PLL today (78703), as a continuation/extension of the problems we have been having with ALSX the past few days. After troubleshooting and multiple hours down after the 17:08 lockloss, we seemed to be clear of the PLL unlocking issue after I noticed that the PLL had managed to stay locked for 25 minutes, and then relocking went just like normal.
LOG:

14:30 Detector Observing at 155Mpc and has been Locked for almost 5 hours

15:32 Out of Observing for calibration measurements (78699) and commissioning
    15:39 bb done
    16:01 Simulines done
16:03 Lockloss right at beginning of commissioning
16:04 Started an initial alignment
    - had to touch up ALSY because increase flashes couldn't catch it
16:41 Initial alignment done, going to sit in DOWN for commissioning test
17:08 Starting relocking
    - Lockloss from LOCKING_ARMS_GREEN x2
    - earthquake starts rolling through
    - Lockloss from ACQUIRE_PRMI
    - Held in GREEN_ARMS_MANUAL to check for issues with ALSX PLL
    - Lockloss from FIND_IR x3
18:06 I started another initial alignment, skipping over green GREEN_ARMS_MANUAL
18:19 Initial alignment done, relocking
    - CHECK_CRYSTAL_FREQUENCY for ALSX
    - lockloss from LOCKING_ALS
    - CHECK_CRYSTAL_FREQUENCY for ALSX
    - Lockloss from FIND_IR x 2
- Sitting in GREEN_ARMS_MANUAL due to ALSX PLL unable to stay locked, even when ALSX is in the UNLOCKED state 

20:03 Trying relocking after I saw that the last PLL error was from 25 minutes ago
    - Everything worked perfectly
20:45 NOMINAL_LOW_NOISE
20:48 Observing

21:45 Lockloss
21:48 Initial alignment
22:09 IA done, relocking
23:01 NOMINAL_LOW_NOISE
23:04 Observing                                                                                                                                                                                                                                                                                                                                                               

TITLE: 06/27 Eve Shift: 2300-0800 UTC (1600-0100 PST), all times posted in UTC
STATE of H1: Observing at 149Mpc
OUTGOING OPERATOR: Oli
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 11mph Gusts, 8mph 5min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.07 μm/s
QUICK SUMMARY:

H1 is currently observing and every thing seems to be functioning as expected.
 

RyanC, Oli, Rahul

As reported before (LHO alog 78574 and 76635) we have assembled and characterized in total five A+ HRTS Freestanding version for O5. In this alog I am posting a comparison plot of all five suspensions (assembly S/N 03, 08, 01, 02, 11 ) for their transfer function measurements, please find them attached below (the second file is the zoomed-in version of the first. Looking at their resonant peaks, shapes and magnitude, I think all five suspensions are very much on top of each other. These results also ties up very well with the model (blue trace). The Y_dof for suspension assembly SN 11 (green trace - see page 6) has slightly higher magnitude above 3Hz. I am still investigation what could be the reason for that.

Lockloss 06/27 @ 21:45UTC

Erik, EJ, Dave:

Following the discovery that h1sush2a's DACs had been in FIFO-HIGH-QUARTER error since 9th April 2024, I have done a rewrite of cds_status_ioc.py to catch these errors and report them on the CDS overview. Future RCG releases will raise these errors to the DAC bit in the STATE_WORD.

I found that cds_status_ioc was quite out of date, and needed a rewrite rather than addition of a DAC status monitor.

The new code's features are:

Get the number of frontends from the IOP INI files in the current DAQ running configuration

Parse the IOP INI files for all of its input data; num FECs, DCU_IDs, Number of ADC per frontend, Number of DAC per frontend.

On each processing run, the ADC_STAT and DAC_STAT PVs are read. None critical bits are masked out, and if any critical bit is bad an error is displayed.

For ADC, critical bits are: ONLINE, CHAN_HOP

for DAC, critical bits are: ONLINE, FIFO_STAT, FIFO_EMPTY, FIFO_HIGHQUARTER, FIFO_FULL

The IOC updates its clock every second, and process the CDS system every 5 minutes (GPS modulo 300). I've added PVs to show processing time, total num of ADCs and total num of DACs in CDS.

Oli, Sheila, Jim, Camilla

We've been having trouble keeping the ALS X arm locked, so Oli put the request for the X arm guardian to "UNLOCKED" which means that it asks the PLL to lock and nothing else.  We've been sitting here for 15 minutes and see that the PLL can't stay locked in this configuration where the ground motion doesn't matter and the laser should easily stay locked.

The second two attachments show how much the fiber beatnote depends on outdoor temperature, it is now varying by more than 20dBm, while last summer with similar temperature swings it would only vary by 4dBm.  This year the problem seems to be coming and going, for about a week at a time the temperature dependence seems to go away. 

We won't be able to lock the IFO while the PLL is not staying locked like this, this problem seems to be coming and going recently, so it may explain a lot of IFO downtime.

Thu Jun 27 10:10:45 2024 INFO: Fill completed in 10min 42secs

Jordan confirmed a good fill curbside.

06/27 16:03 Lockloss after calibration sweep was done and right as commissioning was started. Unknown cause

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.