TITLE: 04/29 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Observing at 150Mpc
OUTGOING OPERATOR: Ryan S
CURRENT ENVIRONMENT:
SEI_ENV state: CALM
Wind: 17mph Gusts, 13mph 5min avg
Primary useism: 0.03 μm/s
Secondary useism: 0.17 μm/s
QUICK SUMMARY:
H1 is Locked for 22 hours and is currently Observing. The Plan is to continue this lock throught the night.
TITLE: 04/29 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Observing at 146Mpc
INCOMING OPERATOR: Tony
SHIFT SUMMARY: Mostly quiet observing day today with just one brief break for some measurements. H1 remained locked the whole shift; current stretch is just over 22 hours.
LOG:
Start Time | System | Name | Location | Lazer_Haz | Task | Time End |
---|---|---|---|---|---|---|
15:02 | FAC | Karen | Opt/Vac Labs | - | Technical cleaning | 15:25 |
15:25 | FAC | Karen | MY | - | Technical cleaning | 16:43 |
15:41 | FAC | Kim | MX | - | Technical cleaning | 16:09 |
16:15 | FAC | Tyler | EX | - | Checking for bees | 16:33 |
16:42 | SQZ | Terry, Kar Meng | Opt Lab | LOCAL | SHG work | 19:04 |
17:19 | FAC | Eric | EX, EY | - | Checking chiller yards | 17:52 |
18:58 | CAL | Rick | PCal Lab | - | Inventory | 19:03 |
20:29 | FAC | Tyler | MX | - | Check on contractor | 21:14 |
20:47 | SAF | Travis | FCTE | - | Dropping off laser glasses | 20:56 |
21:17 | SQZ | Terry, Kar Meng | Opt Lab | LOCAL | SHG work | Ongoing |
21:23 | ISC | Gabriele, Sheila, Jennie | CR/Remote | - | FF/A2L measurements | 22:00 |
21:40 | PEM | Robert | LVEA | - | Moving black glass guillotine | 21:45 |
I reran the A2L script today during our small on the hop commissioning window.
The new gains have been entered in the guardian via the a2l_gains dictionary in userapps/isc/h1/guardian/lscparams.py
'FINAL':{
'P2L':{'ITMX':-0.9646, #+1.0,
'ITMY':-0.4071, #+1.0,
'ETMX':3.2767,
'ETMY':4.8886}, #+1.0},
'Y2L':{'ITMX':2.7253, #+1.0,
'ITMY':-2.0093, #+1.0,
'ETMX':4.7658,
'ETMY':0.9094 },#+1.0},# Centered on the optic #removed offsets from EY IX IY 220705 gm jd ec
}#spots that are the center of the optic
}#close a2l gains dict
and accepted in SDF in OBSERVE.snap, see attached images.
Jennie W, Sheila
The gains that changed the most were ITMX P2L (19%) and ITMY Y2L (17%).
Looking at the power spectrum before and after the A2L gain change and the SRCL feedforard update, DARM is the same above 14 Hz and below 8 Hz but shows slight improvement between these frequencies.
The bottom two rows of plots show coherences between DARM and angular degrees of freedom (middle row), and DARM and suspension pitch motion (bottom room). With old FF and A2L on the left, new on the right.
The only ASC DOF (two middle plots) that seems to have got worse is CHARD pitch, DHARD yaw is hard to tell as it sees the calibration lines between 10 and 20 Hz. Also the SRCL coupling to DARM got better confirming the new FF is working.
The limiting degree of freedom seems to be CHARD pitch now. Looking at the bottom plots, ETMY and ETM X pitch coherence with DARM have got worse.
[Jennie, Sheila, Gabriele]
We retuned the SRCL FF, by doing the usual injections. While fitting, we just tried to change the gain of the filter that was running a bit, and that was enough to get an improved subtraction. The new filter module (FM2) is active and in guardian.
H1 dropping observing as of 21:19 UTC for ~30 minutes for quick feedforward measurements.
H1 back to observing as of 21:58 UTC.
Jennie W, Annamaria, Sheila
Annamaria suggested we check ASC-POP_A and B trends during the time we got a drop in optical gain before last maintenance Tuesday, as a result of which we had to change our SR2 and SR3 alignment.
We don't see a large change in the sums or the pitch and yaw over the drop in range and optical gain between 18:33:47 UTC on the 22nd and 12:3803 UTC on the 23rd.
From the plot it can be seen that the optical gain dropped by about 5% over this period.
The range dropped by ~10 Mpc.
ASC_POP_B_SUM dropped by 0.1%.
ASC_POP_B_PIT dropped by 0.08%.
ASC_POP_B_YAW dropped by 4.9%.
ASC_POP_A_NSUM dropped by 0.06%.
ASC_POP_A_PIT dropped by 1.3%.
ASC_POP_A_YAW dropped by 0.7%.
Looking at the zoomed out version is seems these are within normal drifts in previous locks.
State of H1: Observing at 146Mpc
Quiet morning of observing, wind picked up slightly over the past few hours. H1 has now been locked for over 18 hours.
Full report available here.
Summary:
Mon Apr 29 10:08:54 2024 INFO: Fill completed in 8min 51secs
Gerardo confirmed a good fill curbside.
TJ, Ryan S.
We've been occasionally seeing some SDF differences come up after relocking related to the ALS Y REFL servo (most recently in alog77478), where the input gain and compensation boosts are being turned off during SHUTTER_ALS. After not finding any Guardian that does this, we decided it must be Beckhoff-controlled, but still wanted to understand why this only happens during some lock acquisitions and not others. When doing some trending, we saw that the gain and compensation boosts are turned on when the arm cavity is locked and turned off again when unlocked, but not turned off when shuttered (everything gets cleaned up after a lockloss). In some cases, after switching actuation from ALS WFS to DHARD, the green arm alignment drifts to the point where an arm (usually Y) unlocks and the input gain and compensation boosts are turned off before ALS is shuttered. As seen in the attachment, there's a ~5 second gap between when the arm nodes move to their SHUTTERED states and the light is actually shuttered, which we tracked down to a 6 second wait time in ISC_LOCK and believe is a remnant of old code. This wait time has been lowered from 6 seconds down to 1 second as there's really no reason to wait here anymore.
SDFs are correctly set and ISC_LOCK.py changes have been committed to svn, but the node will need to be loaded when next out of observing.
ISC_LOCK has been loaded with this change.
FAMIS 20026
Transmission through the PMC is continuing to get worse, so I'll see about trying to touch up the alignment just using the pico mirrors during maintenance. However, this may be indicative of a larger alignment issue through the amps, which would require much more invasive on-table alignment, which we would need to tackle at a later date with more time.
TITLE: 04/29 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Observing at 148Mpc
OUTGOING OPERATOR: Ryan C
CURRENT ENVIRONMENT:
SEI_ENV state: CALM
Wind: 14mph Gusts, 10mph 5min avg
Primary useism: 0.02 μm/s
Secondary useism: 0.15 μm/s
QUICK SUMMARY: H1 has been locked for 14 hours. Range has had some brief drops overnight, but is still generally hanging around 150Mpc.
TITLE: 04/29 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Observing at 150Mpc
INCOMING OPERATOR: Ryan C
CURRENT ENVIRONMENT:
SEI_ENV state: CALM
Wind: 7mph Gusts, 5mph 5min avg
Primary useism: 0.02 μm/s
Secondary useism: 0.15 μm/s
QUICK SUMMARY:
H1 locked for 6 + hours and Observing.
Robert has removed his cable going across the road and the road cones.
SuperEvent candidate 240429an
And the Wind has died down over the last 4 hours.
After an Initial Alignment,H1 got back to Nominal_Low_Noise at 00:47 UTC .
Waited for the ADS Cameras, and realized that there are 2 new SDFs that needed accepting.
This must have been an automated change. Mr. Short also said that he had to Accept these Diffs.
H1 Is now in Observing.
On Friday I shut down the main HVAC (15:48 Apr 26 UTC - 16:08) to evaluate coupling. The range was under 160 Mpc, so this will have to be redone after we regain range, in order to fully evaluate the effect of the improvements made over the break. The range did increase by a couple of Mpc, but Figure 1 shows this was due to jitter coupling in the 100-200 region, not input arm scattering at lower frequencies.
Figure 1 also shows that there are other drivers of jitter coupling below 100 Hz and above 200 Hz. I used a mobile accelerometer to search for the source of jitter in the 25-40 Hz band, and found that the dominant source was the Warehouse HVAC (see Figure 2). I think that the HVAC may be shorted to the building.
Another picket fence issue at 03:37 UTC, I think the third in the past few weeks. I restarted the process on nuc5.
Thank you for this summary. I will go dig in the code to see what is happening.
On first glance: the array of data should never be empty on an update, but somehow it is happening some times. I will add a failsafe (or an assert) so that the code can handle this exception and hopefully be more robust.
There had been a suggestion (passed to me by Sheila) that we should measure the beam positions on SRM and SR2 after the big move that we made this week (which is summarized in alog 77427).
We don't have a premade script to do this like we have for the test masses, so I just did it by hand. One at a time, I put in a line using the ADS screen to SR2 or SRM pit or yaw, then changed the corresponding A2L element to minimize the line height in CAL-DELTAL_EXTERNAL. I was also watching SRCL_IN1 and SRCL_OUT, but the lines disappeared in the SRCL signals before they disappeared in the DARM signal, so I just used DARM.
All A2L values for SR2 and SRM had been 0.0, so I'm not going to bother putting in a 'before' column in the table below since they were all the same value of zreo.
After finding those values, I ran /opt/rtcds/userapps/release/isc/common/scripts/decoup/BeamPosition/CalcSpotPos.py to get from A2L coefficient to beam spot. This script had been made for IMC optics, but since SRM and SR2 are the same style, the calculation should be the same. Reminder of where this calc comes from (it's referenced in the script): alog 31402.
We don't have any 'before' measurements to compare to, but at least we now have some amount of information of where we are on these optics after the big move.
I'm pretty sure that these new A2L values can only be good, so I've accepted them in both safe and observe snaps for SR2 and SRM (see first and second attachments, only 2 rows per SDF table are accepted). These A2L gains for non-test mass suspensions are not under guardian control, so this should be good enough to keep them in place.
In the table below, the Cal-Deltal line reduction factor ends up really just being the ratio of the peak height in DARM before I started doing anything to that dof, and the noise level. To do a better job of measuring this, I would have had to increase my excitation amplitude, but that didn't seem important enough to do given the limited commissioning time we had.
ampl [counts] of line at 30.5 Hz | A2L gain step size when minimizing | CAL-DELTAL line reduction factor | Final A2L gain | Inferred spot position [mm] | |
SR2 P2L | 0.1 | 0.1 | 50x | +5.5 | 11.1 |
SR2 Y2L | 0.1 | 0.3 | 45x | -4.5 | -9.1 |
SRM P2L | 0.7 | 0.1 | 100x | -3.4 | -6.8 |
SRM Y2L | 0.7 | 0.1 | 50x | +3.6 | 7.2 |
I don't have time right now to think through the whole left-vs-right sign convention (it's discussed in alog 31402), but it does look like we're rather 'diagonal' in the SRC now, since the signs of the spot positions are opposite for SR2 vs SRM (eg one positive P2L and one negative P2L means the beam is on opposite sides of center).
Anamaria, Sheila
About sign conventions:
This means that on SR2 the spot is 11mm above the rotation center and 9 mm in the negative X direction from the center. On SRM the spot is 6.8mm below the center of rotation, and 7.2mm in the negative x direction.
Sheila and Keita have recently found and fixed sign convention errors. Please see alog 78393 for the corrected interpretation of A2L gains.