For FAMIS #39857: All fan trends look nice and flat.
TITLE: 03/05 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
SEI_ENV state: MAINTENANCE
Wind: 10mph Gusts, 7mph 3min avg
Primary useism: 0.02 μm/s
Secondary useism: 0.24 μm/s
QUICK SUMMARY:
HAM1 (@4.0e-6) & HAM7 (@2.6e-7) continue to pump down. There has been mention of opening gate valves (5 & 7), but not sure when. CEBEX contractors are out and continue to unload pallets of brick.
S. Muusse
The translation and rotation stage issues have been solved with help from patrick and daniel and now all optomechanics and sensors can be accessed and operated through beckhoff!
Dependent on a delivery, the feed throughs and rack should be constructed tomorrow allowing a full test of the electronics on the completed Y table.
Table 2 (X-arm) is almost fully aligned with only the beam dump and visible laser left to install.
WP 13063
CHETA field cables have been pulled. This includes the picomotor, analog readback, and laser interlock cables.
F. Clara, M. Pirello
Travis, Jordan
We were able to leak check the new JAC viewport on the -Y door of HAM1 today. Since this is an o-ring sealed viewport we bagged the viewport leaving the conflat seal exposed before spraying helium, in an attempt to reduce helium diffusion through the o-ring.
With the helium leak detector backing the main turbopump, the helium background was ~4E-10 Torr-l/s. While spraying the flange/leak check ports, the helium signal slowly rose (30-60 seconds) to maximum of ~1E-9 Torr-l/s, typical of permeation through an o-ring, see attached picture.
Once, leak checking was completed, we disconnected the leak detector from the main turbo pump cart, isolated the turbopump from the chamber, and moved the SS500 cart closer to HAM2 to allow room for the new JAC table to be moved into place.
HAM1 continues to be pumped via turbopump, while the annulus volume is still pumping with both the aux carts and the annulus ion pumps.
TITLE: 03/04 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY:
HAM1 continues to pump down, but we are getting closer to opening gate valves. CEBEX work near MY had several truck loads of bricks (on pallets) put in lay-down areas. Had a couple of tours on-site. HAM1 ISCT1 & new small JAC in-air tables were rolled into place.
LOG:
Randy, Mitch, Betsy, Camilla, Jenne, Jennie, Richard
ISCT1 was forklifted into place by Randy and the table height checked. The new JAC table, IOT2R, was pushed into place and lifted off it's of it's wheels, height may need to be further adjusted once we start alignment. Bellows were attached. Photos of JAC table attached.
Surveying for building footprint and water tie-in/routing actuals have been placed, and the masonry sub has begun staging CMU block while we await our grading permit. B. Gateley M. Link T. Guidry
Addressed TCS Chillers (Wed [Mar4] 1242-0105pm local time) & CLOSED FAMIS #28557. (Last checked 89168)
* When filling the TCSy chiller noticed that inside the mesh filter, part of the white mesh was folded up (see here). So, I folded it down to make it look "normal" (see here). But after this the water level dropped about "0.6cm", so I needed to add some more water (total water added is the 60mL listed above).
[Jennie, Masayuki]
Using the power measurement by Jennie et al. on Feb 24, I calibrated the TRANS PD.
Channels used:
• H1:JAC-TRANS_A_DC_DCCURRENT (Beckhoff)
• H1:JAC-TRANS_A_LF_INMON (fast)
Offset was difficult to estimate, so it was assumed to be zero.
With 1 W input from the IMC, the signals were
• 0.00185 A (Beckhoff)
• 261.2 counts (fast)
According to Jennie’s alog, the power on the PD was 37 µW, giving a responsivity of
37uW/0.00185A ~ 0.02 W/A
Using HAM1 output = 96 mW for 100 mW JAC input, the effective pick-off reflectivity is
37uW/(96mW*10)= 38.5ppm
Accounting for the mW→W conversion factor (×1000), the effective pick-off fraction is ~3.85(%).
Restarted the slow controls system to fix an issue with the CHETA motor stages.
Updated the slowcontrols SDF for h1syscs[aux,isc,tcs]sdf, restarted these processes on h1ecatmon0 and accepted+monitored the new not-init channels.
The update revealed that there are 12 CS AUX channels which are pending to be added to the DAQ (H1EPICS_ECATAUXCS.ini).
+[H1:SYS-MOTION_C_PZTSHUTTER_B_COUNT]
+[H1:SYS-MOTION_C_PZTSHUTTER_B_ERROR_CODE]
+[H1:SYS-MOTION_C_PZTSHUTTER_B_ERROR_FLAG]
+[H1:SYS-MOTION_C_PZTSHUTTER_B_HIGH]
+[H1:SYS-MOTION_C_PZTSHUTTER_B_LIMITS]
+[H1:SYS-MOTION_C_PZTSHUTTER_B_LOW]
+[H1:SYS-MOTION_C_PZTSHUTTER_B_NULL]
+[H1:SYS-MOTION_C_PZTSHUTTER_B_RANGE]
+[H1:SYS-MOTION_C_PZTSHUTTER_B_STATE]
+[H1:SYS-MOTION_C_PZTSHUTTER_B_TRIG]
+[H1:SYS-MOTION_C_PZTSHUTTER_B_VOLTS]
I took the .5-800hz tfs last night on HAM1 ISI, to see if the 70hz feature was improved by the periscope brace. Short version, it has been and I now see the ~170hz that I measure here. There's also a feature at ~102hz that could be a number of things, but I didn't see that in the B&K measurement of the periscope+stiffener.
First attached image are the L2L gs13 tfs I took last night. Data below .5hz is from measurements I took last year, I don't expect those to have changed. Above .5hz is new data. These new measurements were taken with HEPI locked, so features around the pier modes at 15hz might not be permanent. I might also get better resolution above 200hz when the pumpdown is done and it's a little quieter at the chamber.
Second image are the data from last year, after adding the viton to the periscope dog clamps. That viton is still in place, but we now also have the stiffener added, so the sharp feature at 70hz is now moved to 170hz.
Third and fourth images are the CPS tfs. These are harder to compare because HEPI was unlocked for the fourth image (june 2025 tf) and locked for the third (last night).
I will post C2C tfs when I get there. Hope to see if I can increase the loop gain on HAM1 with the 70hz feature gone, we'll see.
These are the gs13 c2c tfs. First image is the data from last night, second image is the data from last year. Similar story, the new tfs look a little easier to wrap loops around, but the 170hz feature will require some notching. There is also still some feature at 75hz in the X and Z dofs. Hmm.
I've touched up the isolation loops, removing the 70hz notches where I could and increased ugfs to more normal levels, from 22hz before to 25-30 hz. This should mostly help below 10hz.
I ran a trend of the BSC2 dust monitor (LVEA10) since its been moved to the platform (alog89137).
Attached are monthly TCS trends for HWS & CO2 lasers. (FAMIS link)
Ongoing earthquake is shaking ITMY to a point where its SWWD was going to DACKILL seib1, I've bypassed both SEI and SUS for now.
Note that ITMY is the only SWWD which is ringing up.
Not sure what was happening here, but it was not just the earthquake ringing up the sus. HWWD killed the ISI coildrivers, the sus continued to shake bad enough it was saturating all of the ISI seismometers for several minutes. I had to turn on off the sus damping, let the quad calm down, go reset the HWWD and ISI coil drivers before the ISI stopped shaking. When I went to the CER, I found all of the ISI coil drivers powered off. I reset the HWWD on the sus rack, then power cycled the ISI coil drivers to get them back on. Quad and ISI have both calmed down, damping is back on, Corey is slowly bringing the ISI back up. Unclear if there was cable pulling in the area that caused this, coincident with the earthquake.
/ligo/home/camilla.compton/Documents/sqz/templates/dtt/20250731_SQZdata.xml screenshot attached and /ligo/home/sheila.dwyer/Noise_Budget_repos/quantumnoisebudgeting/data_files/higher_order_modes_sqzdataset2W.xml screenshot attached.| Type | Time (UTC) | Angle | DTT Ref in SQZ | DTT ref in HOM | Notes |
| No SQZ | 15:20:00 -15:25:00 | N/A | ref 0 | ref 0,1 | |
| FDS Mid - SQZ | 15:31:00 - 15:34:00 | (-)120 | ref 1 | ref 2,3 | Was close to ASQZ so retook below |
| FDS Mid + SQZ | 15:36:00 - 15:39:00 | (-) 30 | ref 2 | ref 4,5 | |
| FDS Mid - SQZ | 15:40:00 - 15:43:00 | (-)150 | ref 3 | ref 6,7 |
| OPO Setpoint | Amplified Max | Amplified Min | UnAmp | Dark | NLG | Note |
| 80 | 0.0533596 | 0.00250 | 0.007039 | -1.93e-5 | 7.6 | Temp already optimized |
In this data I only see evidence of one mode at 5kHz, and one mode at 10kHz. If the astigmatism that caused the X arm second order modes to separate into two in 86107 is due to the point absorbers or some other laser heating, it could make sense that we don't see astigmatism at 2W. However, the ring heater settings for the two arms are different, so I would have expected the X and Y arm HOMs to be separated even at 2W. This data was taken with 0.44W on ITMX RH (per segment), 1W per segment on ETMX RH, 0W on ITMY RH, and 1.5W per segment on ETMY RH.
Using a cursor to find the edges of the rotation from the three mid sqz traces that Camilla tok, the 5kHz mode frequency is 4956.5+/- 20 Hz, and the 10kHz mode is at 9981.5 +/- 19.5 Hz. This suggests that the second order mode is at 99% of 2* first order mode frequency, similar to the ratio that we saw at full power. 86107. In the attached screenshot, the top panel shows where I put the cursor to measure the location of the 5kHz mode, the lime veritcal line in the bottom plots shows twice that frequency, 9913 Hz, which is clearly below the sqz rotation caused by the HOMs.
The hour times in my data table are all incorrect, should be starting at 17:20UTC.
When we started the data taking with NO_SQZ at 15:20UTC, the IFO had been down and the CO2 lasers off for 2hours 5mins.
At Matt's request I revisited this data.
We didn't plan on doing subtraction on this data at the time we took it, so we didn't save the high rate individual PD time series to do the cross correlation. Instead, I made a rough shot noise model (a line in a semilog plot), subtracted that in quadrature from the no squeezing data to estimate the non quantum noise and subtract that from the squeezing measurements.
Above I wrote that there is only one mode at 5kHz, and one at 10kHz, but after doing the rudimentary subtraction this data does seem to suggest that there are two modes at 10kHz, which we would expect since the ring heater settings are different for the two arms. The rotation that is partially hidden by quantum noise and is around 9875-9900 Hz, and seems to rotate in the opposite direction from the more visible one at 10kHz. (This is different from what was seen at full power in 86107 and in the similar ADF measurements in Kevin's comment).
The code used to make these plots is based on 86107 and is available here.
