Transfer functions for SR3 and OM1 in partial vacuum are looking good!

HPI(HAM5&6) - LOCKED and OFFLINE

ISI(HAM5&6) - DAMPED

VAC(HAM5&6) - Currently at 10^-5 Torr

Status of suspension

OPTIC    ALIGNOFFSET    CD STATE

SR3         OFF                     1, LP OFF

OM1       OFF                     Fixed in 2, LP ON

Filepaths

SR3

TFs - $(sustrunk)/HLTS/H1/SR3/SAGM1/Data/2024-08-08_1800_H1SUSSR3_M1_WhiteNoise_*.xml

Analysis - $(sustrunk)/HLTS/H1/SR3/SAGM1/Data/2024-08-08_1800_H1SUSSR3_M1*

Comparison to pre-vent and post-vent in-air - $(sustrunk)/HLTS/Common/Data/allhltss_2024-08-08_H1SUSSR3_M1_Phase4b_unDamped_ALL*_TFs.pdf

OM1

TFs - $(sustrunk)/HTTS/H1/OM1/SAGM1/Data/2024-08-08_1900_H1SUSOM1_M1_WhiteNoise_*.xml

Analysis - $(sustrunk)/HTTS/H1/OM1/SAGM1/Data/2024-08-08_1900_H1SUSOM1*

Comparison to pre-vent and post-vent in-air - $(sustrunk)/HTTS/Common/Data/allhttss_2024-08-08_OM1_H1SUSHTTS_Undamped_ALL*_TFs.pdf
 

J. Kissel

Took the opportunity to grab post-OFI-repair vent, in-vac transfer functions of the following HAM5 and HAM6 SUS. Of course, we're not at full observing-level vacuum, but most of the molecules are out of the chamber that would contribute to buoyancy, so the SUS are at the position they will be in observing-level vacuum.

Executive summary: I'm happy with all SUS that I measured -- including the two that were "interesting" and or touched during this vent -- SRM and OFI.
For the story about SRM, see LHO:79433.
And of course, the OFI had had optics replaced.
Several other SUS in HAM5 / 6 were not touched during the vent (aside from a few alignment sliders), so we didn't expect any degradation in performance and don't see any. These SUS are ready to resume observing gravitational waves!

Processed results will be posted as comments below.

Some relevant details of the status of the suspensions and their surroundings during the measurements.
Environment Status (Same for HAM5 and HAM6)
    ISI DAMPED
    HPI OFFLINE and mechanically locked
    VAC Pressure at 1e-5 Torr
 
Status of alignment offsets and coil driver switchable filter requested (CD) State.
    OPTIC   ON/OFF     Value (if on, [urad])     CD State
    SRM     ON          P/Y : +1663 / -3095      1, LP OFF
    ZM6     OFF         (n/a)                    Fixed in 2, LP ON
    OFI     OFF         (n/a)                    Fixed in 2, LP ON
    OMC     ON          P/Y : +340.5 / 0.0       1, LP OFF
    OM2     ON          P/Y : +716 / -1701       Fixed in 2, LP ON
    OM3     ON          P/Y : -1147 / +20        Fixed in 2, LP ON

File Names:
    SRM         HSTS/H1/SRM/SAGM1/Data/2024-08-08_1823_H1SUSSRM_M1_WhiteNoise*.xml
    ZM6         HXDS/H1/ZM6/SAGM1/Data/2024-08-08_1828_H1SUSZM6_M1_WhiteNoise*.xml
    OFI         OFIS/H1/OFI/SAGM1/Data/2024-08-08_1850_H1SUSOFI_M1_WhiteNoise*.xml
    OMC         OMCS/H1/OMC/SAGM1/Data/2024-08-08_1900_H1SUSOMC_M1_WhiteNoise*.xml
    OM2         HXDS/H1/OM2/SAGM1/Data/2024-08-08_1920_H1SUSOM2_M1_WhiteNoise*.xml
    OM3         HTTS/H1/OM3/SAGM1/Data/2024-08-08_1935_H1SUSOM3_M1_WhiteNoise*.xml

Presently the instrument air supply to the Corner Station is supplied via a piston style compressor at the chiller yard where it feeds underground to the Mechanical Room. Beginning on Sunday, the compressor failed to maintain the pressure required at the GV's. Since then, Facilities has been preparing to install a new, scroll style compressor and drying tower to replace the old and partially decommissioned system.

Given that taking the old compressor completely out of service for the swap will completely remove the supply of air to the instrument air system, and that in parallel we have the Kobelco running, I have tapped into the outlet of the Kobelco (post-dryer). In the past this has fed the manifold for the TMDS system but is currently not in use.

Using a basic off the shelf air regulator behind a ball valve, I have set the feed pressure at ~70psi. An analog gauge on the instrument air piping reinforced this. As this is very much a temporary system, between this new addition and the instrument airline is a basic compressor hose connected via quick disconnect fittings.

In conjunction with re-routing the supply air, I have valved out the feed line from the old compressor inside the Mechanical Room. This does two things; First, it will prevent us from unnecessarily charging the line from the mechanical room back to the chiller yard. And two, will allow us to monitor the behavior of the old compressor over the weekend whilst demand is lifted from it. With demand lifted and the blow-down disabled, should we see any activity from the compressor, we know there is most likely a leak between the two points and will require further investigation.


Attached photos of the connections between Kobelco>IA and compressor runtime at time of blowdown disable.

R. McCarthy G. Moreno J. Csizmazia T. Guidry

Thu Aug 08 08:08:45 2024 INFO: Fill completed in 8min 41secs

On Monday Aug 5 around 21:00 UTC, Sam and I went looking for several accelerometers that LigoCAM reported were disconnected: H1:PEM-CS_ACC_HAM5_SRM_X_DQ, H1:PEM-CS_ACC_HAM5_SRM_Y_DQ, H1:PEM-CS_ACC_HAM6_OMC_X_DQ, and H1:PEM-CS_ACC_LVEAFLOOR_BS_Y_DQ. We found that the switch for H1:PEM-CS_ACC_LVEAFLOOR_BS_Y_DQ was turned off in the electronics bay so we turned it back on and it is now connected. Yesterday Wednesday Aug 7 between 19:40-20:09 UTC, I went back with Janos' help to take care of the other three accelerometers. The cords at the accelerometers had been disconnected for opening the HAM chambers, so we plugged them back in. All of these accelerometers are now connected, with confirmation from LigoCAM.

TITLE: 08/08 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Corrective Maintenance
OUTGOING OPERATOR: n/a
CURRENT ENVIRONMENT:
    SEI_ENV state: MAINTENANCE
    Wind: 12mph Gusts, 10mph 5min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.06 μm/s
QUICK SUMMARY:

VACUUM Alarms:

• Verbal Alarm:  "Vacuum pressure high at BSC2" a few times per minute starting at about 6am local time (which looks like it's the PT120B gauge).
  • will lower volume Verbal until it is addressed.
• Alarm Handler: 
  • PT120B is flashing with a MINOR (yellow) alarm (corresponding with the Verbal Alarm above).
  • PT110_MOD1 has had a constant MINOR (yellow) alarm.
• The attached plot of PT120B shows how these alarms correspond with some choppiness (jumps up in pressure) starting around 6am local.

There was also a big earthquake last night that arrived at around 1am local (8utc) (M7.1 near Nichinan, Japan); this took down L1 & V1 for about 5hrs.

Yesterday PT154 was found with a blinking "amber" LED, per the user manual:

Gauge will stay there for now, if posible and approved by others a replacement will be installed.  A plot of the failure is attached, signal for the pressure gauge is the RED trace.

Unfortunately this is not the only one that I found that is in trouble, another gauge located at position C1 has a continuous "amber" LED, per the user manual:

I walked and visited all other gauges, MKS brand, and they appear to be OK.

FRS ticked opened for faulty gauge, 31787.

Managed to get the turbo up to speed, no isssues to get there.  Once the pressure dropped below 5X10^-05 Torr, metal valves were closed (one at the turbo station, purge valve at HAM6, and the purge valve at output mode cleaner tube), then swapped to the small scroll pump from the two ISP1000.  Setpoints were set and CC for BSC2 was powered on.  ISP1000 pumps are off now.

Leaving site now.

Today's activities:
- The HAM5/HAM6 annulus system pumpdown continues. The Turbo backing line is already at around ~1E-5 Torr
- The pumpdown of the corner has continued. The pressure as of this writing is 9E-1 Torr, which indicates that the Turbos can be switched on tomorrow. A pressure update will be in the comments, when the roughing pumps will be stopped for today
- The pumpdown of HAM7 and the relay tube continues. HAM7 will catch up with the relay tube tomorrow, and so those 2 volumes will be valved together
- The mobile cleanroom in the FCT was pushed above C-4 position, as a gauge will be added there shortly - see pic.

- The instrument air system will be bypassed with the Kobelco compressor, as the inst. air compressor keeps failing (for more detail see aLog: https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=79503)

At 17:03 while the compressor was in its run cycle pressurizing the air from 60PSI to 85PSI it stopped running. This is the same failure mode we saw yesterday at 14:55 (see attachment).

The FMCS and VAC teams are out at the chiller yard addressing this as I type.

TITLE: 08/07 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Corrective Maintenance
INCOMING OPERATOR: Oli
SHIFT SUMMARY:

Pump down of the corner volume continues.  Les Guthman and his film crew were in the Control Room to conduct staff interviews for a good chunk of the shift.
LOG:

• 1438-1443 Out to continue Corner volume pump down (janos)
  • 1610-1622 Quick check of pump status (janos)
  • 1841 Back to check on pump status (janos)
  • 2134 Another trip out to check on pump status (janos, travis, gerardo)
• 1446-1536 Technical cleaning:  LVEA (karen,kim)
  • 1558-1700 MX (kim)
  • 1600-1746 optics lab (karen)
  • 1830 woodshop (karen)
• 1454-1504 TCS Chiller level checks (corey)
• 1600 Guthman film crew arriving on-site
  • Van arrived, but did not receive phone call at Ops Station (Tony picked up phone in Fellows area though)---Gate call-in to the Ops phone appear to not be getting through (phone receives phone calls OK)
  • 1638 setting up in the Control Room
• 1616-1622 Looking for camera part in Filter Cavity Enclosure (ryanC escorting)
• Gate call-in to the Ops phone appear to not be getting through (phone receives phone calls OK)
• 1640 Dave adjusted the new air pressure scope to make it easier to see on nuc28
• 1730-2138 Film crew in Control Room
• 1842 Rick tour in lvea
• 1859-1915 PSL fixing of HVAC, dustmonitor, and turning off lights (jason)
  • FYI:  Dustmonitor PSL-102 still shows up as "not working" :(
• 1910 Twin City Metals picking up metal (bubba)
• 1940-2009 Accelerometer search in lvea around HAM5 & 6 (genevieve)
  • 1957 Janos will escort genevieve around the area
• 2230-2243 Parts search at FC End Station (travis, janos)

Original post: https://alog.ligo-la.caltech.edu/SEI/index.php?callRep=2478

I have reinstated the picket that looks into South and Central America on the picket fence code. We will be looking into US.HLID (which came back to life) instead of the inconsistent US.HWUT [see LHO log 79268, LHO log 78404]

We still don't know why the stations keep coming in and out. For now, please git pull at the Picket Fence folder to get the latest update

Long term, I am working on adding a set of backup stations that will trigger manually or automatically, but it will take some time to roll out.

If any of the LVEA pneumatic gatevalues were to change their status (OPEN, SOFT-CLOSE, HARD-CLOSE), the alarms system will now send out text and email messages within 2 minutes.

Ran the Check_Dust_Monitor script and one of the PSL dust monitor is stuck at the same value & will need to be checked.

edit:  this is a KNOWN issue.  It's just that incursions into the PSL are somewhat rare & I had forgotten about this one.  This is a dust monitor in the anteroom--the dust monitor in the main PSL room is still operational.

HAM7 pump down went very smooth, no issues encountered during this process.

Blowdown dew point measurement was at -40.0 ^oC.

Pump down cart, SS500, was set to manage the pump down, now that the turbo pump is on, the cart can manage the selenoid valves in case of an emergency.

Pressure at HAM7 is 1.19X10^-05 Torr.

In response to recent failures of the air compressor that's holding open some of the gate valves:

There's now a 6-hour trend of the air pressure on the lower left corner of the top screen for nuc28.

If the compressor is working, there should be a saw tooth pattern between 60 and 85 PSI, at 90+ minutes per tooth. 

When the pressure drops below 40, the pneumatic gate valves are in danger of closing.

DaveB, RickS

Dave changed the image on the contrl room PSL screen (Nuc 21) and at the Laser Room to show a larger image of the PSL table.

Laser Room make-up air fan speed set to 100%.  Lights are OFF, but will be switched on in the morning.