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:

• ~1500 semi-trucks (brick deliveries) and contractor vehicle traffic begins for CEBEX
• 1539-1809 Walkaround lvea (rigging/garb room checks) and possible craning [randy]
• 1535-1641 LVEA technical cleaning (kim, nellie)
  • 1641-1750 EX for supplies and cleaning (kim)
  • 1845-1911 EY supply check (kim)
• 1535 SPI optics lab laser HAZARD work (jeff)
• 1707-1751 Surveying on backside of Y-arm for cebex (bubba.crew)
• 1712-1715 grabbing dustmonitor in cer (ryanC)
  • 1750-1755 grabbing another dust monitor to test (RyanC)
• 1717-1800 lvea walkthrough (betsy)
• 1716-2350 CHETA cable pulling along x-beam manifold and around beer garden (marc.fil)
• 1720-1730 Isolating ham7 turbo pump (jordan)
• 1741-2356 HAM1 isi loops work off/on today (jim)
• 1757-1809 HAM1 Isolating Aux Carts on annulus (jordan)
• 1815 BSC1 ISI watchdog trips due to severe shaking around BSC1 (also around this time there was an EQ, but this did not affect any other chambers)
  • 1820 SWWD bypassed by Dave to prevent DAQKILL of seib1 (alog 89355)
  • 1835 Jim went out on the floor to see what was shaking the isi & sus
  • 1850 Jim going out to check ISI coil drivers
  • 1910 ISI back to isolated
• 1844 HAM1 leak detector set up (travis, jordan)
• 1902 Looking for Bellows for optics tables (camilla.betsy)
• 1906 2nd load of bricks on large truck arrives to offload at MY---these loads are out near the Chiller Yard
  • 1944 load arrives on site and went to MY chiller yard
• 1917-1937 Ki-Be High School Tour in Control Room (maggie)
• 2043-2312 Forklift prep & ISCT1 + new JAC tables installation (randy)
• 2043-2101 TCS Chillers biweekly check/fill (corey)
• 2107 Beckhoff restart (daniel)
• 2111 ISCT1 rolled back into place (camilla,mitch,randy)
  • 2118 betsy joining
• 2127 BHD work in optics lab (elenna,oli)
• 2142 CEBEX brick truck leaving site (last one?)
• 2149-2233 lvea walkabout (richard)
• 2200-2212 CHETA lab to pick up a rotation stage for slow controls work (sophie)
  • 2218 grabbing another one (sophie)
  • 2311 returning rotation stages (sophie)
• 2207 checking on HAM1 work (jenne)
• 2207 putting stickers on the new little JAC table on the -y of HAM1 (travis)
• 2208-2312 heading out to HAM1 since -Y side is now clear of VAC equipment (jennie)
• 2226 Looking for VAC person in lvea for nitrogen air tank for BHD Top Gun work (elenna.oli)
• 2246-2312 Tour of WSU architecture students (RyanS)
• 2303 BHD work in optics lab (oli, elenna)
  • 2322 Elenna out
• 2356 MER power up sush7 io chassis (fil,marc)
• 2356-0026 Checking EX/EY wind fences (jim)
• 0001 JAC in-air table cable hook up (daniel)

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)

• TCSx Chiller:  Had level of 30.1 cm.  Added 200mL for 30.7cm.
• TCSy Chiller*:  Had level of 10.0 cm.  Added 60mL for 10.6cm.  
• There was no water in the small cup under the slow leak.

* 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.

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.

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.

Wed Mar 04 10:09:48 2026 INFO: Fill completed in 9min 45secs

On an unrelated note, now that HAM1's pressure is steady and in range I have re-enabled it in VACSTAT.