Now that we're at 60 W of input power, I double checked the ISS secondloop array pointing after the vent. We're missing slightly, seemingly pitched off the ISS QPD. The ndscope has Y1 dashed white lines at where the ISS PD values are now. The ISS secondloop PD values from March 12 are the actual traces. We're still locking, and so I leave ISS picoing undone for now. We'll have to leave the ISS secondloop open and pico back onto the array at some point. Based on the attached PSD, this could be responsible for our huge peak at 29 Hz in DARM.
TITLE: 06/02 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: Oli
SHIFT SUMMARY:
Much of today was work in ASC land with H1 locked most of the day at 10W (but started powering up at the end of the shift) and also had the arrival of even more members of the Syracuse LSC Team! But there was also work on the Squeezer toward the end of the day. The plan for tomorrow's Maintenance Day is to continue with Vent Recovery locking work.
Rahul addressed rung up violin modes from this morning and he requested the Oli (EVE operator) to apply these settings new settings (noted in alog 84720).
The day started out with the drama of a fire out beyond End-Y (Fire Dept phoned the Control Room notifying us that they were fighting a fire on SR240 (see attached photo from the roof of the Corner Station).
LOG:
Control Room (Corey, Sheila, Elenna, Oli, Georgia, Craig, Julia, Matt, Keita, Ryan S, Camilla
Notes of what's been done so far today, we've spent the majority of the day locked at POWER_10W, adjusting the ASC sensing matrix and gains:
TITLE: 06/02 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: Corey
CURRENT ENVIRONMENT:
SEI_ENV state: CALM
Wind: 11mph Gusts, 5mph 3min avg
Primary useism: 0.04 μm/s
Secondary useism: 0.31 μm/s
QUICK SUMMARY:
We are sitting in POWER_10W, and have been here for the past several hours. Currently commissioners are still working on the CHARD, INP1, and PRC2 loops, kind of having to swap between all three as they slowly get them better (84711, 84724).
Julia, Georgia, Sheila, Camilla, Elenna
This might be out of date already as some ASC input matrices have already been updated.
On Sunday we had some locklosses as we powered up from a 0.02Hz oscillation. One known issue is we have taken out some gain out of our CHARD loops. We wanted to check our sensing (input) matrices CHARD, INP1 (which both use the refl wfs) and PRC2 (which uses new in vac pop_x).
We sat at 10W, with the input matrix Sheila found last week:
DOF | REFL_A_RF9_I | REFL_A_RF45_I | REFL_B_RF9_I | REFL_B_RF45_I | POP_X_I |
INP1_P | 1 | 1 | |||
CHARD_P | -1 | -0.5 | |||
PRC2_P | -1 | ||||
INP1_Y | 1 | 1 | |||
CHARD_Y | -1 | 1 | |||
PRC2_Y | -1 |
While Elenna measured the phasing using an 8 Hz line, Julia and I added offsets into the loops and looked at the responses in the different sensors.
Some of this is a bit different to what Sheila saw last week, but our ifo alignment has changed. We want to find intrixes that are sensitive to each DOF and ideally are insensitive to the other DOFs.
While writing this another input matrix for INP and CHARD has been put in - https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=84711 - and seems to be working so stay tuned.
We plan to work on our gain heirarchy and hopefully power up further soon!
These are my radar plots for my 8 Hz dither sensing matrix.
Addressed TCS Chillers (Mon [Jun2] 100-125am local) & CLOSED FAMIS #27816:
This morning while Corey and the commissioning team were trying to lock and power up the interferometer, the violin modes were pretty rung up. For most of the modes, I was able to damp them down using nominal settings except three of them which are listed below along with the settings which seems to be working for now.
Made those changes for 2W damping, and will hopefully be able to confirm whether they also work for 60W. For ITMX 03 and ITMY 05, I added new 2W settings for IX3 and IY5. These changes were saved in lsc_params and the violin damping guardian has been reloaded.
FAMIS 31088
No major events of note. The slow changes in PMC TRANS and REFL power seem to follow AMP2 output power.
TJ, Camilla, Checking as Sheila was concerned about this as Georgia/Craig need to move the ITMX SPOT GAIN "CENTER
" 84702.
Attached are the HWS Live plots comparing when we get to 10W and 120s later for ITMX and ITMY now. And also for ITMX and ITMY at our last 10W power up before the vent (note that then we don't pause at 10W and continue increasing power during the 120s).
Can see no obvious new point absorbers, ITMY looks perfect and ITMX has the same point absorbers as before, it;s possible there's a new point absorber on the right of the optics (orange arrow in attached) but it doesn't look scary. We will continue to check this but it's possible that our alignment has just changed (has since 66198) so that we can now see this point.
Sheila and Elenna turned the CO2s on as we were powering up from 10W to 25W. Attached is the 2 minutes after CO2s were turned on while we were sat at 15W for 4 minutes.
Can see the CO2 patterns of ITMX and ITMY. IY CO2 looks good but IX CO2 it looks off in YAW, we should check how this compares to the IFO spot at full power. It would be worth doing some dither tests to see if this needs adjusting.
HAM1 annulus system appears to have issues pumping down, currently its annulus ion pump is railed 10 mA, and the pump cart pumping on this system is sitting at 6.04x10-05 Torr, see attached photo.
Process thus far:
I plan to visit HAM1 to check the rest of the bolts on -Y door and +Y door.
HAM1 internal pressure is doing good, see attached photo of the pressure at the SS-500 pump cart pumping on HAM1. Second attachment is a 5.5 day plot of the pressure internal to HAM1, the large step noted on the plot is due to the introduction of HAM1 ion pump.
(Jordan V., Gerardo M.)
Today we went and performed the following on the annulus system for HAM1:
Now we wait to see the results of today's changes overnight.
Mon Jun 02 10:12:16 2025 INFO: Fill completed in 12min 13secs
Gerardo confirmed a good fill curbside.
M. Todd, C. Cahillane
Yesterday we were interested in some noise we were seeing around 6Hz in various ASC signals (mostly CHARD pitch). This motivated us to look at the RMs, so I took a PSD of each DOF for both RMs. We are not sure why there are such differences in all the dofs, and if there are unintended side-effects to this.
I'm specifically wondering why RM2 has larger peaks around 6.25 Hz in all dofs...
This feature is the primary vertical resonance of the HTTS. The ISI HAM1's control system has still not yet been commissioned, so the decision to *unmute* the HTTS "because the ISI isolation performance should be much better than the Stack" will plague us until that's true. See "muting the HTTS blade springs" ECR E2200181, which confirms the 6.25 Hz resonance. See Integration Issue 33777 for historical notes, specifically Comment 2's record of IIET call discussion and agreement to *unmute*. I suspect the low-frequency performance will also improve once the ISI's controls are commissioned. Let's give Jim some time to figure out how to dance around the ~70 Hz feature that he's dealing with, see LHO:84638 (and last week's lock-acquisition problems do to ignoring it LHO:84640).
Camilla, TJ
Sheila asked us to look for post vent point absorbers, but when we went to check, we found that the code hadn't been running since May 23rd.
Looking further into it, we could log into the machines and open the tmux sessions, but the code was frozen from May 23 821UTC and could not be Control C'd. I then tried a pkill on that python process, this also did not work. Trying to reboot the machines remotely aslo didn't work. I power cycled the machines from the MSR, then we were finally able to start the code up. ITMX needed the camera initialized for some reason.
We are thinking about ways to catch this in the future, maybe having DIAG_MAIN monitoring if values are updating properyly.
TITLE: 06/02 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: TJ
CURRENT ENVIRONMENT:
SEI_ENV state: CALM
Wind: 15mph Gusts, 8mph 3min avg
Primary useism: 0.03 μm/s
Secondary useism: 0.22 μm/s
QUICK SUMMARY:
H1 was down for the night, so will most likely run an alignment and then go for Power 10W and then assess.
For chamber closeout finalization, this morning I * placed a 3" contam control wafer on the center of the HAM1 table today * took a few last pics, removed the stowed 3x septum covers (missed removing the 4th one from the septum, thanks vac good eye, pic 4) * looked around for left behind tools * retraced the beam path to look for errand in-the-way cables (none observed) * inspected under and around lower area of table for left goods (none found) * cleaned up last tool pans to get ready for doors * particle counts were <50 all sizes, zero most often * purposefully coiled the to-be-used in post O4 next vent cable with the peek connector not grounding to anything - it sits in the PSL side door well below the table * all subsytems have signed for doors, so we are putting doors on.
Tagging for epo
Keita, Elenna, Oli, Rahul, Camilla
Summary: Majority of REFL path optics are aligned. Need to beam profile and finish LSC and ASC REFL diode placement on this path and place/check all beam dumps.
This morning, Keita opened the light pipe, locked the IMC but couldn't see the beam as nicely as he did on AS_AIR yesterday. Since that time he had restored PR2 and PR3 to a time we were last locked. He reverted those changes as we could see the beam back at AS_AIR. Checked again IM4 trans QPD was the same as yesterday.
Additionally M16 was placed roughly in the correct position, all optics are now on HAM1 (apart from PM1) and the class-B pans are empty and packed up.
Left IMC locked.
Attaching a bunch of photos of the current alignment:
(I don't have the names of the optics on the SLED so I'm calling them by the order that the beam goes through them)
- Alignment from RM2 onto M5 (attachment1, attachment2)
- Coming from M5, through M6, and onto first lens on SLED (attachment3)
- Coming through first SLED lens onto second SLED lens (attachment4)
- Through SLED lenses and onto first steering mirror (attachment5, attachment6)
- Alignment onto SLED pico mirror (attachment7)
- Top view of pico showing that there is available range in both pitch and yaw (attachment8)
- Distance between L1 and front of LSC REFL A (L1 focal length is 222mm) (attachment9, attachment10)
- Distance from LSC REFL A to M18 (attachment11)
- Distance from LSC REFL B to M18 - needs to be moved closer (attachment12)
About REFL WFS sled:
Tagging for EPO