First alog regarding BHSS!

Betsy, Mitch, Corey, and I moved the BHSS platform from the staging building to the optics lab. We wrapped it in foil and ameristat, and rolled it over on a cart.

Previously, Oli, Camilla, and I have prepped all the optic mounts for both BHSS and BHD optics. These mounts are all currently laid out on the optics lab table with cloths and foil. All the BHSS optics have been clocked to their correct angle using the clocking tool.

BHSS is placed directly on the clean optics table, no foil. Oli has staged 4" height optics to direct laser beam to the platform once we are ready for alignment.

Oli, Camilla and I today pulled first contact on some BHSS optics. We have successfully installed both PCX 333 lenses for BHSS platform (QPD-T-A/B-L1), the 7% 20 deg splitters (QPD-T-A/B-R1), one 50% 45 deg splitter (QPD-T-A-R2) and two BHSS HRs, 36-R1 and TRN-T1. All of these optics have labels (except 36-R1) so they can be distinguished. Serial numbers have been noted in the optics BOM.

These optics are currently mounted in a random place in the center of the platform so they can be kept clean.

Oli and I struggled to remove FC from two 50% 45 deg mirrors and several HR mirrors. Other mirrors were still dirty and needed to be recleaned. We will return to these optics later to re-FC to pull the original FC or clean off spots.

OMCs are still in their cases covered in foil on the same optics table. They were previously opened by Camilla, Jenne, Betsy, and I and confirmed by eye to look good. Begum mailed us 4 great DCPDs from the tested batch, these are still wrapped and bagged and in a tote in the optics lab.

OMC cradle prep is on hold while we wait for EP30 glue to arrive. Other to do items include prepping alignment tooling, finishing cable pylons, and removing FC for the remaining mirrors, etc.

Photos to come...

TITLE: 03/05 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY:

The arms were opened up today! 

• And this afternoon, we started work on the green arm alignment and after about 2-3hrs Jenne got both arms aligned with WFS (not with spool cameras).  Woo Woo!  
• Alignment work on JAC in-air table also started in the afternoon.

I got pulled from my shift for a good chunk of the 2nd half of my shift, and so Ryan Short helped me out and will post about afternoon LOG of activities. 

LOG:

• 1551-1651 LVEA technical cleaning (nellie.kim)
  • 1654-1741 MY/FCES cleaning (nellie)
  • 1700-1807 MX cleaning (kim)
  • 1808 H2 room (kim)
• 1551-1603 Hauling parts into East Bay (randy)
• 1605-1632 EY cleanroom curtains (randy)
• 1644 First Contacting BHD optics (camilla)
• 1710-1735 Unlocking HEPI of BSC2 (jim)
• 1723-1729 Checking HAM1+7 (travis)
• 1720-ish Cabling up ISCT1 & IOT1 (marc.fil)
• 1739 tour (kissel)
• 1751-1807 IOT1 work (daniel.jennie)
• 1753 CHETA table alignment (sophie)
• 1806-1809 grabbing a dust monitor in cer (ryanC)
• 1806-1816 checking elevator arm in east bay (randy)
• 1813-1822 turn off turbo H7 isolate aux cart H2 (jordan)
• 1815 wipe off optics table for BHSS in optics lab(oli)
• 1820 chatting w/ fil at isct1 (richard)
• 1830-2000 Moving BHSS from Staging to Optics Lab (elenna,mitch,betsy,corey)
  • ...RyanS covered Ops during this time & for a good chunk of the rest of the afternoon  (THANKS, dude!)
• 2046-2059 continue elevator arm work in east bay (randy)
• 2119 Checking electronics for JAC wfs at the rack (daniel)
• 2122 Working on IOT1 (new little JAC table) to look for beam (jennie.jason)
• 2140 HAM1 relay work & climbing around HAM1 (gerardo,fil)
• 2115-0020 Green arm alignment (jenne, I wrote down the steps she took & will post later...probably in the wiki)

Used the test input of the WFS patch panel to check the 45MHz transfer functions of the JAC WFS. Measurement point was at the RF monitor output of the demodulator. The attached plots show:

1. JAC WFS A segment 1 (all segments very similar)
2. JAC WFS B segment 1 (all segments very similar)
3. ASC REFL_A segment 1 (for comparison)
4. ASC POP_X segment 1 (for comparison)

Observations:

• JAC WFS B has 10x the response of all the others. 
• JAC WFS A seems to be a 36/45MHz unit, whereas WFS B seems to be a 9/45MHz unit.
• Serial # of JAC WFS A: S1300512
• Serial # of JAC WFS B: S1300504

The data sheet confirms these observations including the test input transconductance beeing 10x higher for S1300512.

(Travis S., Jordan V., Gerardo M.)

After taking an RGA, HAM7 chamber was joined to the corner vacuum envelope, we opened RV-1, FCV-1, FCV-2, FCV-3, FCV-4 and FCV-5, no issues to report.

Then we opened GV5 and GV7.  GV7 started opening at 45 psi after a double clank noise, left GV7 set at 55 psi.  GV5 took some time to open, we got up to 40 psi and then left it alone, for about 20 minutes, then increased pressure to 45 psi a loud clank and then the valve opened, GV5 was set at 55 psi.

WP13071 is closed now.

I did the monthly wind fence inspection yesterday. No new issues. Damage to the one panel at EY seems stable, no damage noted at EX. 

Thu Mar 05 10:10:28 2026 INFO: Fill completed in 10min 25secs

Closes FAMIS37262, last checked in alog88698.

Everything looks as expected, no new issues. There was an odd dust spike (10 minutes of >1000 cts, so 2 cycles of sampling) from the PSL102 (Anteroom) dust monitor on Sat Feb 7th around 11:30 local.

Fil, Erik, Dave:

Fil ran the 24V-DC power to the h1sush6 IO Chassis on the MER Wed afternoon and I completed the fiber connections to the rear of the computer in the MSR. Erik and I booted h1sush6 for the first time late Wed afternoon after setting the BIOS and IPMI.

Current hardware status:

computer has Dolphin card installed but not connected to the switch. MTP at the computer end sends 4-Adnaco and 1-timing pairs to the MER via port-3 on the patch.

This is a W2275 14core machine, was cdsproxmox2. Its disks have been removed and it needed a full set of RT BIOS changes.

IO Chassis is "what was left" of h1sush2b after cards were moved over to the new h1sush12 chassis. So it has a mismatch of cards, but each Adnaco has a unique layout which is all that is needed to confirm Adnaco functionality.

A1 [slot1=TC, slot4=18AO8]

A2 [slot1=18AO8,slot2=16AO16]

A3 []

A4 [slot1=BIO]

The computer booted with some difficulty because it was trying to load the non-existent h1iopsush6 model. We were finally able to ssh onto the machine and showcards sees all the cards except A4. 

Also the timing card is not syncing, we will investigate that today.

A minor issue, we had some DNS issues on the workstation-LAN which Erik resolved.

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:

• ~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

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.