TITLE: 03/29 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 156Mpc
INCOMING OPERATOR: Corey
SHIFT SUMMARY: I was able to get a coherence measurement during the first lock. We've relocked 3 times this shift, no issues relocking.
LOG:
Start Time | System | Name | Location | Lazer_Haz | Task | Time End |
---|---|---|---|---|---|---|
18:50 | EPO | Janos | Overpass, Yarm | N | Tour | 19:46 |
I've been damping ITMY modes 5/6 with half the nominal gain (0.005) during the second/third lock as I wasn't totally convinced the damping was going well before with the higher gain. 3/4 monitors were going down but the DARM line height on DTT wasn't really changing. TJ said he had success with this lower gain the other day as well. I put the new damping settings for ETMY mode1 into lscparams.
20:22 UTC lockloss
21:36 UTC observing
18:13 UTC lockloss right before the scheduled calibration suite, sad
19:29 UTC observing
Sat Mar 29 10:13:20 2025 INFO: Fill completed in 13min 16secs
TC-B was quite noisy during the fill today.
TITLE: 03/29 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 141Mpc
OUTGOING OPERATOR: Ryan S
CURRENT ENVIRONMENT:
SEI_ENV state: CALM
Wind: 4mph Gusts, 1mph 3min avg
Primary useism: 0.02 μm/s
Secondary useism: 0.26 μm/s
QUICK SUMMARY:
TITLE: 03/28 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 149Mpc
INCOMING OPERATOR: Ryan S
SHIFT SUMMARY:
Had a bit of moody winds tonight---no sustained winds, not really strong winds, but the middle of the shift had waves of short gusty periods, two of which took H1 down. Luckily the winds died down toward the end of the shift, to allow H1 to get back to Observing. Took ETMy Mode1 to the settings Ryan C mentions in his summary.
LOG:
For FAMIS #26369: All looks well for the last week for all site HVAC fans (see attached trends).
BRSx is in the middle of both of its thresholds, and BRSy is slowly trending down to the lower threshold.
Not sure what did it to the PSL's FSS, but noticed we were stuck before the PRC portion of Initial Alignment, and DIAG MAIN had the following messages flashing like the devil:
On the FSS screen, the autolocker was going wild and the PZT_MON screen was all over the place.
Since the Autolocker was having issues, I toggled the autlocker off/on and this immediately calmed down the FSS and the IMC finally locked back up.
Going to restart the Initial Alignment. Because the winds are still pretty attrocious.
H1 was at NLN for 7min only to have another lockloss at 252utc (1427251941)---as of 434utc this one is still Analyzing, but----Pretty certain this will be chalked up to wind again---this time the gusts were strongest at the Corner (hear alot of wind activity outside and can see lots of tumbleweeds rolling by on the cameras).
H1 had a lockloss from a 4hr53m lock at 1:30utc (1427247021, this has an EY WINDY tag). Winds at EY were picking up around this time.
Gerardo, Dave:
At 16:51:34 Fri 28mar2025 PDT we had another small vacuum glitch in the LVEA, which this time was reported by VACSTAT, detected by those gauges with increased sensitivity (BSC2, CP2, YARM and XARM). Attached trends show this was a modest ~0.1e-09 Torr increase. Rising edge about 10 seconds, pumpdown time about 3 mins.
H1 was locked throughout. I reset vacstat_ioc.service to clear the alarm.
This week Mitch and I opened the can for the ISI destined for HAM1 and started adding damping parts. Spring, flexure and GS13 can dampers have all been added. TMDs have been mostly assembled, but have not been tuned yet, we will figure that out next week. I just finished setting up the CPS field interface chassis with the new triax sensors after setting the phases for the sensors. For the moment one of the cards is set as a timing master, I will have to change that when we go to connect to the system. Next week, TMD tuning, st0 L4C install, in-vac parts for the new CPS and pre-installing lifting pads and covers for install into the chamber. Then we can close up and wait for HAM1 chamber to be ready to receive.
First 2 pics are a couple shots of the ISI, third shows the TMDs we built this afternoon, which still need magnets and tuning.
TITLE: 03/28 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 151Mpc
INCOMING OPERATOR: Corey
SHIFT SUMMARY: We lost lock from another earthquake, the wind started picking up during the afternoon but we relocked easily after an alignment. The violins have been damping nicely. The new settings I found for ETMY mode1 are FM1+FM5+FM10 G= -0.1, they damp mode1 well but don't really affect mode6.
LOG:
Start Time | System | Name | Location | Lazer_Haz | Task | Time End |
---|---|---|---|---|---|---|
17:19 | FAC | Chinook | VPW | N | Heat pump work, started at ~16:30 | 18:13 |
17:54 | EE | Marc | CER | N | Trace C4 power supply wire | 18:16 |
18:01 | ISC | Mayank | Optics lab | LOCAL | ISS array | 23:15 |
18:16 | EE | Fil, Marc | CER | N | SUS-C4 power supply swap | 18:37 |
18:17 | ISC | Jennie | Optics lab | LOCAL | ISS array | 19:23 |
18:39 | FIT | Ibrahim | MidY | N | walk | 19:29 |
18:56 | TCS | Camilla | Optics lab | N | Turn on CO2 laser | 19:13 |
19:18 | ISC | Betsy | LVEA/CER | N | Grab vacstat bags | 19:39 |
20:17 | ISC | Keita | Optics lab | LOCAL | ISS array, PD adjustment | 22:15 |
20:24 | PSL | Jason | Optics lab | LOCAL | NPRO tests | 22:51 |
20:42 | TCS | Camilla, Matt | Optics lab | LOCAL | TCS CO2 laser work | 22:01 |
21:10 | PSL | RyanS | Optics lab | LOCAL | Help Jason with NPRO tests | 22:51 |
TITLE: 03/28 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: 29mph Gusts, 18mph 3min avg
Primary useism: 0.07 μm/s
Secondary useism: 0.41 μm/s
QUICK SUMMARY:
RyanC handing over an Observing H1 (going on 2.8hrs). Violins are elevated, but they are damping down. Situation normal.
Was a bit breezy during my drive up here (Corner has some gusts just under 30mph).
I accidently left the ADF off yesterday and set FC de-tuning to -34 vs nominal -36Hz 83597and 83601 where sdfs were accepted.
Jennie W, Sheila
While Camilla changed the SRCL tuning (nominal for SRCL1_OFFSET is -191 counts) for squeezer tests today Sheila and I wanted to check if DHARD sensors are still sensitive to DARM. As there is coupling from DARM to DHARD and then DHARD back to DARM, this changes the DARM OLG and thus the sensing function.
I tried to check on whether the sensing function was affected by DHARD currently by looking at the coherence between low frequency PCAL lines below 20 Hz in DARM. The only one we still use is 17.1Hz, there where others used to monitor the low frequency sensing function and the SRC detuning, but these are no longer in use. The other calibration lines still in use below 20Hz are injections on the ETMX suspension.
Francisco looked at this in 2024 in alog #80267, for different offset values of the AS A WFS cwhich are used as a sensor in DHARD. For a setting of 0, which matches the current setting of this offset, the coherence (bottom graph) between DARM and DHARD looks like it is bellow 1 at 17.1 Hz, the SRCL1_OFFSET at the time was -290 counts.
I compared short spectra of DARM with coherences from CAL-DELTAL_EXTERNAL_DQ to ASC-DHARD_P_SM_DQ and ASC-DHARD_Y_SM_DQ. See this image.
For the detunings used, the 17.1Hz line only seems to show up strongly in the -90 count offset, see image of the darm spectra in the top left graph, DARM coherence with DHARD_P in the middle row left graph, DARM coherence with DHARD_Y in the bottom left graph, and the DHARD_P spectra in the top right graph. From the spectra it looks like the 17.1 Hz line is almost buried in the noise for most of the detunings.
Since all these measurements only used ~ 3 mins of data I decided to compare the hour long period from this entry where Camilla had the SRCL1 offset at -290 counts, to a period after commissioning was over when it was back at the nominal of -191 counts.
See this image where I have also added a graph of DHARD_Y spectrum in the middle right of the image.
Purple is the -290 count SRCL offset and Yellow is the -191 count offset. The coupling of the PCAL line to DHARD P and Y does not really change between the two different detunings, but since there is some coupling to DHARD we might want to revisit the AS A WFS offset. Also the coherence from DARM to DHARD_Y (bottom left graph in my first image below) for the same SRCL1 OFFSET (-290 counts, see this image) as Francisco's measurement was 0.6, compared to the 0.1 coherence he found so that might be a reason to keep looking at this issue.
Finally I include an ndscope of the optical spring frequency (f_S) and the coupled cavity pole frequency (f_C) changing with the detuning. NB: For future me, that optical spring frequency channel defaults to zero when the calculated value is very small I think.
Closes FAMIS26379
Laser Status:
NPRO output power is 1.864W
AMP1 output power is 70.39W
AMP2 output power is 140.2W
NPRO watchdog is GREEN
AMP1 watchdog is GREEN
AMP2 watchdog is GREEN
PDWD watchdog is GREEN
PMC:
It has been locked 51 days, 18 hr 58 minutes
Reflected power = 22.69W
Transmitted power = 106.0W
PowerSum = 128.7W
FSS:
It has been locked for 0 days 0 hr and 59 min
TPD[V] = 0.662V
ISS:
The diffracted power is around 4.2%
Last saturation event was 0 days 8 hours and 41 minutes ago
Possible Issues:
FSS TPD is low
After Jasons touch up the TPD is now ~0.833 V