WP13110 IO Chassis Timing Card upgrades
Marc, Erik, Tony, Dave:
We upgraded the Mid and End Station IO Chassis. They all had the TC firmware upgrade and only needed the sync ribbon cable upgrade. All the models were running RCG5.5.2 with the exception of SEI and PEM-MID which were still at RCG5.5.0. These were upgraded by performing a rev-locked build in place with the new RCG. No DAQ restart was needed.
Only issue was h1susauxey did not power completely power down when the systemctl poweroff command was issued and I had to use IPMI to complete the power down.
Status of the IO Chassis upgrade can be found at T2600143
BSC2 SWWD trips and LSC Timing glitch
Late in the afternoon the B2H34 SWWD tripped due to BSC2 work. Because the beam splitter sus is now combined with HAM3,4 I chose to untrip this WD rather than leave it down overnight.
Around this time h1ioplsc0 jumped a timing cycle, most probably due to rack/wiring work. I restarted all the models on h1lsc0 to clear this.
Restart Log:
Thu09Apr2026
LOC TIME HOSTNAME MODEL/REBOOT
13:45:25 h1susex ***REBOOT*** <<< EX IO Chasis work
13:45:28 h1seiex ***REBOOT***
13:45:31 h1iscex ***REBOOT***
13:45:35 h1susauxex ***REBOOT***
13:46:34 h1susauxex h1iopsusauxex
13:46:47 h1susauxex h1susauxex
13:47:01 h1susex h1iopsusex
13:47:08 h1seiex h1iopseiex
13:47:12 h1iscex h1iopiscex
13:47:14 h1susex h1susetmx
13:47:21 h1seiex h1hpietmx
13:47:25 h1iscex h1pemex
13:47:27 h1susex h1sustmsx
13:47:34 h1seiex h1isietmx
13:47:38 h1iscex h1iscex
13:47:40 h1susex h1susetmxpi
13:47:51 h1iscex h1calex
13:48:04 h1iscex h1alsex
14:04:08 h1pemmx ***REBOOT*** <<< MX IO Chassis work
14:05:05 h1pemmx h1ioppemmx
14:05:18 h1pemmx h1pemmx
14:31:11 h1iscey ***REBOOT*** <<< EY IO Chassis wor
14:31:13 h1susey ***REBOOT***
14:31:19 h1seiey ***REBOOT***
14:31:30 h1susauxey ***REBOOT***
14:32:29 h1susauxey h1iopsusauxey
14:32:42 h1susauxey h1susauxey
14:32:42 h1susey h1iopsusey
14:32:52 h1iscey h1iopiscey
14:32:53 h1seiey h1iopseiey
14:32:55 h1susey h1susetmy
14:33:05 h1iscey h1pemey
14:33:06 h1seiey h1hpietmy
14:33:08 h1susey h1sustmsy
14:33:18 h1iscey h1iscey
14:33:19 h1seiey h1isietmy
14:33:21 h1susey h1susetmypi
14:33:31 h1iscey h1caley
14:33:44 h1iscey h1alsey
14:42:46 h1pemmy ***REBOOT*** <<< MY IO Chassis work
14:43:43 h1pemmy h1ioppemmy
14:43:56 h1pemmy h1pemmy
17:22:46 h1lsc0 h1ioplsc0 <<< Recover LSC0 from timing glitch
17:23:00 h1lsc0 h1lsc
17:23:14 h1lsc0 h1lscaux
17:23:28 h1lsc0 h1sqz
17:23:42 h1lsc0 h1ascsqzfc
TITLE: 04/10 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
SEI_ENV state: MAINTENANCE
Wind: 4mph Gusts, 2mph 3min avg
Primary useism: 0.01 μm/s
Secondary useism: 0.14 μm/s
QUICK SUMMARY:
IFO is in IDLE for MAINTENANCE
BSC2 and HAM3 prep and vacuum work to continue
It dawned on me recently that with the scratched view ports for CHETA, the delay of the CHETA roll out could have a subtle saving grace.
The intended use for IR1 is to heat the ITM with the same power as the absorbed power, so that the ITMs would remain in more or less the same thermal state at all times, making DRMI locking fast and reliable, and removing some of the impact on SRC detuning changing over time as the ITM lenses would evolve less than in O4.
It appears that in the CHETA Design Document, the effects on mode spacing and therefore Parametric Instabilities (PIs) was completely overlooked. Shame, no PI expert in LIGO was consulted, I'm even an author on the cited document in the design document and how we used CHETA like actuators at UWA to mitigate PI.
Very simplistically, rolling out CHETA only for the ITMs (as was the plan for the upcoming IR1) would have two impacts on how the optical mode spacing evolves:
In O4 LHO's QUAD Radii of curvature's operating point has them stuck between two lock-losing PIs, and they haven't managed to demonstrate reliable damping of either. This lead to several periods in O4 where their lock stretches would be repeatedly cut short at around 4 hours.
The implementation of CHETA on ITMs only would have put them closer to their 10.4 kHz PIs as a starting condition, and because the mode spacing would be changing more slowly over time, they would experience the frequency matched condition of PI for longer periods of time. Thus:
I could spend time modelling this but its blindingly obvious once you notice.
CHETA on both ETMs and ITMs would theoretically allow you to start with essentially thermalised mode spacing, allowing you to more reliably side-step PIs.
Jenne, Oli
JM3 is no longer saturating.
During this investigation, we ended up finding the last time that we offloaded MC WFS, so for future reference, the last time we offloaded MCWFS was 2026/03/10 21:51 UTC.
JM3 Saturating
Earlier TJ noticed that JM3 was saturating. I went to take a look and found that the overdamping on JM1 and JM3 that had been done for in-chamber work at the beginning of April (89732) hadn't been undone, so now that the HAM1 doors were on, the damping was just way too much(JM1, JM3). I reverted these damping changes on both JM1 and JM3(JM1, JM3).
However, this didn't stop the saturations on JM3. The LOCK filter bank was sending in large negative numbers that were coming in from WFS DOF3 P and Y. With Jenne's help, we were able to sort of figure out what had happened.
The channel we look at for triggering the IMC WFS is IMC-IMC_TRIGGER_INMON, which is IMC-MC2_TRANS_NSUM_OUT_DQ divided by IMC-PWR_IN_NORM_MON. It seems like for some reason this morning IMC-MC2_TRANS_NSUM_OUT_DQ started going up, probably from noise and light in the LVEA, and ended up triggering the IMC WFS (the value was actually still lower than the trigger threshold of 40 so that's still a mystery though). Anyway, once the WFS were triggered, they were turning off and on over the next 4.5 hours. This caused garbage noise to build up in the DOF integrators, which got sent out to MC1, MC2, MC3, and JM3.
We cleared history on these filter banks, which fixed JM3.
IMC_LOCK Guardian Request
We think that something should be put into the IMC_LOCK guardian so that when we go through MOVE_TO_OFFLINE, something happens to prevent the WFS from turning on, like turning off the DOF inputs. Then when we go through DOWN, we turn the WFS inputs back on. This would prevent the integrators from building up garbage noise like what happened here.
TITLE: 04/09 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY:
HAM3 +Y door is removed
BSC1 door bolts are being broken.
GRB- Short E632727 17:33 UTC notification (IFO status: Vented .)
Both HAM3 doors are Off.
I have attached screen shots of all of the SDF Diffs from EX & EY before the CDS team rebooted IOPs for both End stations after Marc replaced the IOP Ribbon cables.
20:26 UTC EX IOP Restarts
20:58 UTC EY IOP Restarts
Started to bring EX back up at 21:12 UTC untripped watchdogs for HEPI & ISI.
Fil is unplugging some IMC cables.
JM3 Looks to have grown in motion over the last few hours for some reason. Oli believes that JM3 is "Over damped" due to the wrong gain not being reverted, Oli's alog with more detailed coming soon.
BSC2 dust mon counts for the day.
| Start Time | System | Name | Location | Lazer_Haz | Task | Time End |
|---|---|---|---|---|---|---|
| 14:34 | FAC | Randy , Eric | LVEA BSC2 | n | Working on platforms near BSC2 & Fly Engine Hoste | 15:05 |
| 14:34 | FCA | Nellie & Kim | LVEA | n | Technical cleaning and Supplies | 15:17 |
| 15:46 | FAC | Nellie & Kim | LVEA | N | Techincal cleaning & Supplies | 17:01 |
| 16:15 | VAC | Randy | LVEA | N | Preparing to break bolts on BSCs | 19:15 |
| 16:29 | VAC | Gerardo, Jordan, Travis | LVEA HAM3 | N | Prepping for removing Bolts. Gerardo Still in. | 18:50 |
| 16:46 | VAC | Corey | LVEA | N | Prepping to break bolts off of BSCs | 18:58 |
| 17:23 | PSL | Jason | Mech Rm | N | Draining PSL Chiller | 17:34 |
| 17:33 | Safety | Richard | LVEA | N | Helping with Door removal | 17:33 |
| 17:48 | FAC | Tyler & Conel Oil | Water tank | N | Refueling diesel | 17:48 |
| 17:51 | BHSS | Elenna, Oli | Optics Lab | YES | Working on BHSS | 19:28 |
| 18:21 | SEI | Jim | LVEA | N | Unplugging a few cables | 18:41 |
| 19:00 | FAC | Kim | LVEA | N | Getting Supplies. | 19:03 |
| 19:22 | BUSI | Kim B. | Mids & Ends | No | Reconnaissance mission for Documents. | 21:52 |
| 19:38 | SUS | Corey | LVEA BSCs | N | Breaking Bolts on BSC1 & 2 | 22:10 |
| 19:46 | EE | Fil | CER & LVEA | N | Cabling in CER & Output Arm | 22:46 |
| 20:03 | SUS | Randy | LVEA | N | Breaking Bolts Off BSC1 & 2 | 22:19 |
| 20:28 | VAC | Gerardo & Jordan | LVEA BSC1 | N | Turning bolts off, Gerardo out early | 22:12 |
| 20:43 | CDS & EE | Erik & Marc | EX &EY | N | Replacing Ribbon cable & Rebooting IOPs | 22:00 |
| 20:49 | VAC | Travis | LVEA | N | Helping with Bolt removal and supplies. | 22:05 |
| 20:54 | Safety | Richard | LVEA | N | Seeking Fil | 21:24 |
| 20:56 | SUS | Oli | LVEA | N | Looking for parts | 22:31 |
| 21:34 | BHSS | Oli & TJ | Optics lab | N | Working on Manta Ray | 23:26 |
| 21:35 | SEI | Jim | LVEA | N | Locking HAM3 | 23:23 |
| 21:57 | Tour | Elenna & Tour | Control RM & Overpass | n | Giving a tour | 21:57 |
| 22:21 | sus | Richard | LVEA BSC2 | N | Setting up camera for Beam Splitter Swap | 23:08 |
| 22:39 | VAC | Gerardo, Jordan, Travis | LVEA | N | Checking BSC2 work | 23:11 |
(Jordan V, Corey G)
In prep for upcoming BBSS Install, "broke" bolts (which is slang for loosened them) on:
BSC1's +Y Door Bolts (mostly) Removed & Accelerometer Cable Disconnected
BSC1's door had all bolts but (4) removed. Sadly, I removed the bottom (easy ones) bolts first and then when I got to the top bolts they were very hard to loosen because of some sag. Additionally, their access is horrible with: a stiffening plate for the chamber right above the rear access to these bolts, then there are cable trays also in the way, and the C3 fabric cover is draped in your face the whole time. Jordan helped out and we were able to get the last top bolt removed. We also loosened the (4) bolts 1-turn which is the typical procedure.
There was an accelerometer still cabled up to this door. I disconnected the cable (labeled "PEM:BSC1_ACC_X") and stuffed the cable into the cable tray above this door.
Time lapse of me removing half the bolts in this LINK (since we only files allowed in alog have to be smaller than 15Mb.) :(
BSC2's Dome Bolts (mostly) Removed, But Have A Galled Bolt!
BSC2's dome bolts were removed. 4-bolts were left in place (they were loosened and then tightened up a little). One notable, is there is 1-galled dome bolt. Jordan and I used the long wrenches to see if we could use more force to help it break loose, but no luck. We did not try pouring some alcohol on the bolt to help as a lubricant. The bolt is loose and has about 1-2mm of a gap on it. So, the pros could try use even longer cheater bars, a saw cutter, or they were also chatting about a tool to cut the nut off. At any rate,
(Jordan V., Travis S., Randy T., Corey G., Gerardo M.)
The removal was somewhat cumbersome for both doors, but the doors are off HAM3, on the +Y door both O-rings popped out at the bottom of the chamber, they were easily coaxed back into the O-ring groove, both O-rings were out from 5 to 7 O'clock, both bolt holes at this location have traces of "rust". The -Y side door was a bit more sticky, it took some time to convince the door to come loose, and we had O-rings out of the groove from 4:30 to 6:15 O'clock, both of them at one point. They went back into the O-ring groove without a major issue.
Flange protector were installed and both C3 covers, purge is up.
I ended up joining the VAC/FAC crew in the middle of their work. Snapped some additional photos and videos when I could.
[Oli, Elenna]
Summary: Oli and I finished the alignment of all the optics on the BHSS. We were able to place beamdumps to capture the reflected beams off of the four QPDs.
Oli wrote up a summary of the work from yesterday, 89836, and they noted a mistake in the alignment of the B path. We were able to correct that alignment, so the reflected beam from QPD-T-B-R2 goes to QPD B 1 and the transmitted beam reflects off QPD-T-B-R3 to the QPD B 2. Keep in mind that we are following the naming convention that's currently in D2000405 and the BHSS build document T2100190. We found that we had placed B-R2 one hole wrong yesterday, and once we had corrected this, it was much easier to center the beams on the mirrors and get them to the correct QPDs.
Oli briefly described this issue yesterday, but I want to emphasize again: we struggled to use the D2400130 alignment template to align the mirror called "36-R1". This mirror is a high reflector that steers the beam to a splitter that splits to the on-platform OMCB REFL path, and then off-platform to the LO WFS. Because this mirror is a high reflector, it has black glass clipped to the back, and the screw to hold the clip in place protrudes and interferes with the place the optic is supposed to press against the alignment template. This means we have to slightly rethink the HAM6 table alignment plan slightly. I think, since we have aligned the subsequent beamsplitter to the OMCB REFL path, we can follow these steps:
These steps will vary slightly depending if we only do the phase A install, or we do phase A and B together. If we only do phase A, we will just have to guess the 36-R1 placement for now, because there will be no beam to check it.
We are ready to go for cable routing and butterdish clamping on the BHSS!
The BSC2 E3-2 blank was removed and a Type 'C' Dual 25-pin feedthrough (D2000223-S2000697) was installed in its place.
Dripta and I went to EY with PS4 to do a PCAL ES measurement. We followed the T1500062-v21 Procedure but there were changes to the scripts we were using to do the analysis for this measurement.
Obligitory before beam spot.
python3 generate_measurement_data.py --WS PS4 --date 2026-04-02
Reading in config file from python file in scripts
../../../Common/O4PSparams.yaml
PS4 rho, kappa, u_rel on 2026-04-02 corrected to ES temperature 299.9 K :
-4.7013350503199405 -0.0002694340454223 0.0007506545774987483
Copying the scripts into tD directory...
Connected to h1daqnds1
martel run
reading data at start_time: 1459616830
reading data at start_time: 1459617300
reading data at start_time: 1459617635
reading data at start_time: 1459618001
reading data at start_time: 1459618370
reading data at start_time: 1459618700
reading data at start_time: 1459619030
reading data at start_time: 1459619580
reading data at start_time: 1459619930
Ratios: -0.5341166097396405 -0.5439653195648569
writing nds2 data to files
finishing writing
Background Values:
bg1 = 18.656956; Background of TX when WS is at TX
bg2 = 5.029697; Background of WS when WS is at TX
bg3 = 18.678297; Background of TX when WS is at RX
bg4 = 5.152238; Background of WS when WS is at RX
bg5 = 18.675415; Background of TX
bg6 = -0.527308; Background of RX
The uncertainty reported below are Relative Standard Deviation in percent
Intermediate Ratios
RatioWS_TX_it = -0.534117;
RatioWS_TX_ot = -0.543965;
RatioWS_TX_ir = -0.526729;
RatioWS_TX_or = -0.535441;
RatioWS_TX_it_unc = 0.057495;
RatioWS_TX_ot_unc = 0.055038;
RatioWS_TX_ir_unc = 0.052784;
RatioWS_TX_or_unc = 0.054928;
Optical Efficiency
OE_Inner_beam = 0.986428;
OE_Outer_beam = 0.984304;
Weighted_Optical_Efficiency = 0.985366;
OE_Inner_beam_unc = 0.042212;
OE_Outer_beam_unc = 0.043766;
Weighted_Optical_Efficiency_unc = 0.060806;
Martel Voltage fit:
Gradient = 1637.917034;
Intercept = 0.063908;
Power Imbalance = 0.981895;
Endstation Power sensors to WS ratios::
Ratio_WS_TX = -0.927573;
Ratio_WS_RX = -1.384310;
Ratio_WS_TX_unc = 0.046237;
Ratio_WS_RX_unc = 0.042014;
=============================================================
============= Values for Force Coefficients =================
=============================================================
Key Pcal Values :
GS = -5.135100; Gold Standard Value in (V/W)
WS = -4.701335; Working Standard Value
costheta = 0.988362; Angle of incidence
c = 299792458.000000; Speed of Light
End Station Values :
TXWS = -0.927573; Tx to WS Rel responsivity (V/V)
sigma_TXWS = 0.000429; Uncertainity of Tx to WS Rel responsivity (V/V)
RXWS = -1.384310; Rx to WS Rel responsivity (V/V)
sigma_RXWS = 0.000582; Uncertainity of Rx to WS Rel responsivity (V/V)
e = 0.985366; Optical Efficiency
sigma_e = 0.000599; Uncertainity in Optical Efficiency
Martel Voltage fit :
Martel_gradient = 1637.917034; Martel to output channel (C/V)
Martel_intercept = 0.063908; Intercept of fit of Martel to output (C/V)
Power Loss Apportion :
beta = 0.998844; Ratio between input and output (Beta)
E_T = 0.992082; TX Optical efficiency
sigma_E_T = 0.000302; Uncertainity in TX Optical efficiency
E_R = 0.993230; RX Optical Efficiency
sigma_E_R = 0.000302; Uncertainity in RX Optical efficiency
Force Coefficients :
FC_TxPD = 9.158224e-13; TxPD Force Coefficient
FC_RxPD = 6.227715e-13; RxPD Force Coefficient
sigma_FC_TxPD = 4.284257e-24; TxPD Force Coefficient
sigma_FC_RxPD = 2.800786e-24; RxPD Force Coefficient
data written ... to /ligo/gitcommon/Calibration/pcal/O4/ES/measurements/LHO_EndY/tD20260407
Martel_Voltage_test.png
WS_at_RX.png
WS_at_TX.png
WS_at_RX_BOTH_BEAMS.png
Final Report is here: LHO_EndY_PD_ReportV6.pdf
Final beamspot .
Thu Apr 09 10:07:34 2026 INFO: Fill completed in 7min 31secs
WP 13154
a-Plus O5 SUS HAM5 (sush5) System Wiring Diagrams - D2300380
aLIGO SUS HAM 5-6 System Wiring Diagrams - D1002740
SUS-C7/ SUS-C8
Two HAM-A coil drivers were installed in the SUS-C7 rack, part of LO3. We decided to use the existing OMC cables for the new OFI. Cables are going to correct CER and field rack. OMC is being moved to the MER. Once HAM6 is vented the OM1/OM2/OM3 electronics and cabling will be removed.
SEI-C1
Started clean-up of the SEI racks. Removed a HAM ISI Interface Chassis from SEI-C1. This was part of the HAM1 L4C testing back in 2018. Plan is to remove the STS distribution electronics. See alog 89835 for testing of sending signals over IPC.
ISC-C3
The Heliax cable for SPI was landed in ISC-C3 (Patch Panel U37/U38, port 4)
LVEA Work
Finished routing the ±18V power cable for CHETA Y around BSC8 and BSC1. Cable was landed in the TCS-R2 rack. We spent some time cleaning cabling in the TCS rack and the space between the TCSY enclosure and BSC1.
F. Clara, C. Gray
Wed Apr 08 10:07:42 2026 INFO: Fill completed in 7min 39secs
Late entry for yesterday's fill.
TITLE: 04/09 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
SEI_ENV state: MAINTENANCE
Wind: 3mph Gusts, 2mph 3min avg
Primary useism: 0.02 μm/s
Secondary useism: 0.16 μm/s
QUICK SUMMARY:
Work today is Likely going to be removing bolts from chambers HAM3, BSC1, And BSC2's Dome.
(Jordan V., Travis S., Gerardo M.)
To get ahead on door removal, we vented a couple of anuli systems, and we used nitrogen to vent BSC1, BSC2 and HAM3. No issues to report for any of the vents.
Also, we removed most of the bolts from HAM3 chamber doors.
Elenna, Madi, Oli
Today we started tackling the alignment of all the REFL optics that go on the BHSS.
A Path
The A path went relatively smoothly. We had an issue with A-R1 where we had the left side alignment template D2400130 correct and placed A-R1 in it correctly, but the angle of A-R1 was off and sent the beam into the side of the OMCA butter dish. This was possibly due to an error with the clocking tool, but since Elenna had roughly placed the downstream optics last week, we were able to easily fix it by rotating A-R1's mount until it was shooting down the right way. We then were able to get the rest of the REFL A path worked out pretty well, just not the beamdumps.
B Path
The B path caused a few more issues. First, trying to place 36-R1 using the left side template, we realized that we couldn't actually use the tooling since 36-R1 has a J-holder for the black glass, and the screw that holds the J-holder in place doesn't screw in all the way - there are a couple of threads that stick out. Those couple of threads mean that the screw is in the way of the optic sitting in place in the template. To work around this, we ended up installing B-R1 using the right side template, and once we had that we used that as a reference to get 36-R1 reflecting OMCB REFL towards it. Later, we had some trouble getting the beam to B-R3 while also keeping B-R3 at the correct screwhole. We ended up moving it over one screwhole to the left, from L8 / T13 to L9 / T13. At this point we just roughly aligned it to go towards the QPD and left it for now since we might need to move it back over. We might end up needing to shift all the optics in that line over ?
UNFORTUNATELY, we also made a mistake. We aligned B-R2 to hit the B-2 QPD, and B-R3 to hit the B-1 QPD, but it's supposed to be the other way around. We will have to correct this next time!
TITLE: 04/09 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY:
Vacuum team has been Venting the corner station still.
OMC's were taken to SAFE for a model reboot then taken back to aligned.
Dave and Marc swapped some cables and restarted the following IOP's & models today. Please check your SDF's haven't been reverted.
H1IOPOMC0
H1IOPOAF0
H1IOPASC0
Tagging teams that may have SDF issues in the future.
SRM taken to aligned. (I have no idea Why it was misaligned.)
IMC Input Power Channel is no longer "Cray Cray" and is now reading correclty as of Jennie D's alog.
Restart ISI models BSC 1,2, & 3
FW1 Down 19:15 UTC
DC0 down 19:20 UTC
DC0 Re-established at 20:36 UTC
ISI BS Stage 1&2 watchdog tripped 20:36 Likely due to Vac activities.
ISI HAM3 WD tripped 23:33
VAC team says BSC2 annulus is vented & Dome bolts ready to be broken.
LOG:
| Start Time | System | Name | Location | Lazer_Haz | Task | Time End |
|---|---|---|---|---|---|---|
| 18:00 | FAC | Chris | H2 | N | clearing the tumbleweeds @ H2 | 21:01 |
| 19:40 | SUS | Elenna & Madi | Optics Lab | Y | aligning optics on BHSS Elenna out first | 22:39 |
| 20:01 | EE | Fil | CER | N | Rack cabling | 23:08 |
| 20:04 | SUS | Oli & Maddie | Optics lab | Y | BHSS optic alignment | 23:02 |
| 20:29 | SUS | Jeff | CER, LVEA | N | Take pictures of racks, R3 by HAM3 in LVEA | 20:46 |
| 20:53 | PSL | Jason | MER | N | Filling spare PSL chiller | 21:40 |
| 21:19 | SUS | Ibrahim, Travis | LVEA | N | Checking ergo arm | 21:28 |
| 21:23 | PSL | RyanS | MER | N | Help Jason with the chiller | 21:40 |
| 21:45 | FAC | Richard | CER | N | Talk to Fil | 22:00 |
| 22:16 | VAC | Jordan, Gerardo, Travis | LVEA | N | Vent anulus ion pump in @ 1502 | 23:58 |
Per WP13110 we have upgraded the IO chassis listed below.
This link contains the asbuilt for all of the H1 IO Chassis: https://dcc.ligo.org/LIGO-D1301004
This link contains the ECR for the IO Chassis sync cable upgrade: https://dcc.ligo.org/LIGO-E2600069
This link is to the work in progress spreadsheet LHO Front Ends Upgrade Status
Corner:
SUSB2H34 has upgraded firmware and sync
SUSAUXB2H34 has upgraded firmware and sync
SEIH7 has upgraded firmware and sync
OMC0 has upgraded firmware and sync
OAF0 has upgraded firmware and sync
ASC0 has upgraded firmware and sync
LSC0 has upgraded firmware and sync
Here is the current IO Chassis upgrade status:
Completed the following upgrades today. While making rounds I took time to check the Kepco power supplies and found one failed but not tripped, EX-VDD2-U22-RHS Rotor Locked, +/-18V ISC_C1 S1203039. Will exchange at earliest convience.
EX:
H1SUSAUX_EX already had latest firmware, sync cable upgraded
H1SUS_EX already had latest firmware, sync cable upgraded *
H1ISC_EX already had latest firmware, sync cable upgraded
H1SEI_EX already had latest firmware, sync cable upgraded
* H1SUS_EX has 2 LD32 DAC's without heatsinks. It also has a 3rd fan installed.
MX:
H1MX already had latest firmware, sync cable upgraded
EY:
H1SUSAUX_EY already had latest firmware, sync cable upgraded
H1SUS_EY already had latest firmware, sync cable upgraded
H1ISC_EY already had latest firmware, sync cable upgraded
H1SEI_EY already had latest firmware, sync cable upgraded
MY:
H1MX already had latest firmware, sync cable upgraded
We started the venting process for the corner today, including the FCB1 section of the filter cavity attached to BSC3
GVs Closed:
GV2, GV5 (GV7 remains soft closed until repairs are done on the piston cylinder), RV1, FC1, 2, 4, 5.
Dry air dewpoint at vent port = -40.3C
We followed the venting procedure E2300169, until the small burp of dry air into the corner volume, during this "burp" we noticed a small pressure increase at PT114 (CP1 gauge on beamtube side of GV5). There was a clear pressure step from 2.02E-9 to 2.04E-9 Torr at the same time as the dry air burp, see attachment.
We waited for ~15 minutes and repeated the air burp into the corner, again we saw another pressure increase at PT114, though the pressure gauge on the opposite side of CP1 PT124 showed a small decrease at the same time as the pressure increases.
We paused the vent to investigate, PT120, PT114 and PT124 are all pirani/CC gauge pairs and we are investigating if there is any potential crosstalk at the vacuum rack that could be causing this.
More to come.
Corner Vent resumed today, we burped purge air one more time to ~1 torr no pressure step seen on the opposite side of the gate valves.
Continued procedure E2300169, dew point at the purge air point of entry was -44.0C
No further issues encountered, total vent time was ~4 hours, with PT110 up to ~770 torr (PT120 pirani needs atmosphere calibration currently reading ~900 torr).
XBM is currently isolated via GV2 and soft closed GV7, pressure is being maintaned by the XBM turbo station.
Closing WP13153