Yesterday we moved the ISCHT4 (Hartmann sensor) table back in position next to HAM4. Because of the on-going pumping on the vacuum system, the viewport covers remained in place and the light pipes remained disconnected. We spent several hours getting all the cables carefully hooked up again to the table.

We also noticed that the persicopes are severely out of position relative to the holes in enclosure (both shifted about 2" to the right). It's not immediately clear why this is the case but since the enclosure and periscopes are all bolted to the table, it is not a result of the table move. It may be that the table has been out of position for a long time and the periscopes were moved to capture the green beams that exit the vacuum system. Once we get access to the viewports, this should become clearer.

We also installed the nominal HWSY AIRLENS, PLCX-50.8-515.1-UV (per Table 2, T1000179-v20), replacing the lens installed to compensate for the incorrect vacuum lens.

There were a few needing N2 but they were only ones that had slowly been approaching action level over time, some that were just marginally okay, and a few that lost charge as we struggled to get the gauge to seal.  These had not been checked since Oct '16 and none were at action level.  Closing FAMIS 4596.

Measured the NPRO output power using a Gentec Pronto-250 (S/N 233415) power meter.
After the conglomerate of optics after the NPRO but before the phase correcting EOM
the power was measured to be 1.36W.  Going into the power amplifier, 0.90W.  The
output of the monitoring photodiode at this time was 0.708V.  This is the number
reported by the laser MEDM screen.




Jason / Peter

- Gerardo started vacuum pumps
- Fire department testing onsite
- Filiberto, Marc, Richard investigating timing error at end Y
- LVEA transitioned to laser hazard, TJ and Aidan working on TCS table
- Jeff B., Peter and Jason cleaned up cabling and piping in PSL enclosure

8pm local time

Vertex pressure is 92 Torr at turbo station and 220 Torr at pirani gauge (not accurate). Valved out QDP80 roughing pump for the night as a chamber safety precaution. Will resume roughing down tomorrow morning.

Powered down Kobelco purge air skid.

Leaving site now.

• At 6:40 pm local time the vertex pressure read 180 Torr at turbo station and 280 Torr at PT120B pirani gauge (which needs to be replaced - see below).
• Kyle and I leak checked x-beam manifold. There were several conflat flanges marked "untested." We also tested valves with rough vacuum adjacent volumes by removing the KF cap (we labeled these newly vented volumes as "up to air"), tested viewport with newly installed Pcal camera housing, turbo station, IP6, GV 4, 7. Kyle sprayed a significant amount of He on GV7 and about 30 minutes later we detected helium at the leak checker. It started out as a very small signal - mid -11 range and then fell, but then crept up a little higher, fell, crept, fell, crept until about 1e-10 Torr-L/s and then eventually fell back down to background of 1e-11 Torr-L/s. So then we bagged GV7 nipple with ameristat and sprayed He and waited 30 minutes before spraying all the other ports that may have caused the signal (because we were not careful to wait between sprays during the first go-around). No detection. We re-sprayed all other ports but could not re-create the leak.  Tomorrow we will wrap the nipple with mylar and refill our depleted He bottles to fully saturate the bellows nipple. I sprayed too much He at GV4 bonnet so now its annulus IP is off scale. We may need to connect an aux cart to help it out. Left the main turbo valved out for the night and will resume leak checking tomorrow.
• Tested IP6 using the new Gamma power supply by plugging in just one cable at a time to read out individual pump current. Each channel read about 260 uA and together they read 511 mA, so one half of the IP is not worse than the other. It may be that the old power supply was going bad. The pressure is trending down with IP6 valved in (we had it valved out all afternoon during leak checking).
• BSC3 & HAM4 door annuli are still on aux turbo carts

Stuff that needs to be replaced or fixed:

• HAM4 annulus IP does not indicate red on MEDM screen when it's OFF (FRS 8088)
• PT120B pirani gauge needs to be replaced. It's potentiometer bottoms out at 935 Torr at atmospheric pressure so we don't trust its readings (FRS 8089)
• IP1 gate valve leaks (FRS 8090)

TITLE: 05/10 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY:

Pump down of chambers has begun.

LOG:

15:05 UTC Amber leading tour in control room
15:20 UTC Tour leaving control room
15:20 UTC Jeff B. to LVEA and cleaning area, survey for plumbing work
15:32 UTC Gerardo to CER mezzanine to check on HV, and to LVEA
15:46 UTC Jeff B. out
15:57 UTC WP from Chandra to begin pumping
16:00 UTC Travis to beer garden to clean up equipment
16:18 UTC Apollo at end Y, shutting down HVAC for FMCS upgrade
16:18 UTC Kyle to mid X and end X looking for cable
16:30 UTC Apollo through gate
16:37 UTC Kyle back
16:45 UTC Travis done (from email)
16:46 UTC Filiberto and Richard to LVEA tables to document serial numbers of photodiodes
16:47 UTC Karen to VPW and then staging building
17:39 UTC Filiberto and Richard done. Heading to end stations.
17:46 UTC Amber leading tour through control room
17:49 UTC Mike taking guest into LVEA
18:17 UTC Mike and guest out of LVEA
18:21 UTC Hugh had me set CS HEPI pumpcontroller setpoint to 0
18:17 UTC Roughing pumps have been started
18:28 UTC Richard and Filiberto back
19:22 UTC Gerardo, Kyle and Chandra out for lunch
19:37 UTC Hugh had me set CS HEPI pumpcontroller setpoint to 70
19:45 UTC Hugh done in CS
20:24 UTC Aidan and Nutsinee to LVEA to start rebuilding TCS table
20:37 UTC Jim and Hugh to end stations for HEPI accumlators and pump station maitenance
21:05 UTC Gerardo to LVEA to pick up equipment
21:06 UTC Marc to mid Y to pick up parts
21:08 UTC Filiberto to LVEA to help TCS crew reconnect cable
21:19 UTC Hugh at end Y
22:00 UTC Site Weekly meeting
22:54 UTC Hugh to LVEA

Topped off Xtal chiller with 100ml. Diode Chiller looked fine

Started roughing down vertex at 11:17 am local time. Pump curve attached. Someone from vacuum will stay late to babysit the system and then we'll valve out and resume pumping tomorrow morning.

IP1 valve leaks, so we connected a turbo cart to the IP. Pressure looks to be something lower than e-3 torr, so we'll valve that volume back in after we're on the main turbo (with IP powered OFF). Other three IPs look ok (no valve leaks). 

BSC3 & HAM4 door annuli are still on turbo carts.

(Aidan B, Corey G, TJ S, Jim W, PLUS much assistance to by Vacuum Team, Betsy W for prep work, & Jeff B. for staging of Contamination Control supplies)  

All times in PDT

On Tues (May9th) multiple in-vacuum tasks were on the docket for work on H1, and this log covers the work at/inside HAM4:  Replacement of the H1 HWSY VAC LENS.  While performing this work, we followed Vent Plan (E1700124) & followed STEPS #32 - 39.  Also used the Chamber Entry & Exit Procedure (E1201035, sheet4).  Attached are some photo highlights from this job (all photos are on resourcespace [links below]).  

HAM4 was roughly open from 10am - 2pm with only minimal entry within the chamber (access was from the North & only arms/upper body entered the chamber for this work task).

NOTE:  During this activity there was an Alert/Site Area Emergency event on the Hanford site (first time this has happened for LHO in ~20years of being here).

• ~8:30:  Alert issued & within the next hour or so LIGO (& other areas) were asked to shelter-in-place (i.e. do not leave buildings).
• ~12:00:  Non-essential employees were released from work.  This was also the case here at LHO.  Essential LHO staff working on in-vacuum tasks were asked to remain until activities were complete.
• We continued our work throughout this time.

Summary of HAM4 Activities:

• ~10:00am:  HAM4 door removed by Vacuum Team   [STEP 31]
• Particle Counter Readings Taken:    [STEP 32]

• 10:23:  Entering Cleanroom for Lens Swap Task 
• 10:49:  Cloth Cover Removed
• 10:52:  No Contamination Control wafers were on the HAM4 table.  [STEP 32]
• HAM4 ISI's NW & NE Lockers were locked by Corey (Jim was still at BSC3).  [STEP 34]
• 10:56:  PEEK Lens Retaining Ring removed (it was torqued on fairly hard, but able to eventually remove with a small allen key).  [STEP 34]
• 10:57:  Lens removed (barrel marking indicated this was a PLCC [concave] lens).  [STEP 34]
• 11:00-11:05:  Installing H1 HWSY VAC LENS (see T1000179).  This lens had First Contact on it.  Aidan said, "curved surface facing inside chamber".  It was hard to determine curved surface w/ First Contact on lens; TJ & myself made a best guess and installed lens (because First Contact [FC] on lens' faces, handled lens by faces to install in mount).  Retaining ring torqued down by hand with a small allen key.  [STEP 35]
• 11:05-11:08:  TJ adjusted Ion Gun to 20-30psi & we worked on removing FC off curved (i.e. lens surface facing inside chamber).  With air from gun held by TJ and my hand holding PEEK mesh tab, this FC came off easily.  The other FC was a little tougher to remove because it is recessed within mount, but it eventually came off, and no residual FC was observed on the lens.    [STEP 35]
• 11:10-11:15:  Robert took photos down the tube & then I began taking photos many photos of HAM4.  [STEP 36]
  • I'm a little saddened by the photos taken.  Due to low light, hard to see images on camera, and also trying to work fast---many photos are a bit blurry.  HAM4 Photos are on Resourcespace (good ones & blurry ones).
• 11:15-11:18:  Aidan asked TJ & I to look through the lens to see what images looked like:  "Objects looked bigger".  Aidan approved.
  • Looking through the lens we pulled out made objects look "smaller"
• 11:25:  Cloth Cover on Chamber
• 11:30-1:10pm:  Transfer Function measurements made by Jim, Betsy, & Kiwamu.  There were issues running measurements from laptop near HAM4, so measurements were completed in the Control Room.
  • During this time Jim briefly opened cloth cover to UNLOCK HAM4 ISI.  [STEP 37]
  • SR2 & HAM4ISI transfer functions ACCEPTABLE.
• 1:00-1:15:  Get Door/Chamber Closure signatures (E1700161).  [STEP 38]
• 1:20-1:24:  Installed a new Contamintation Control wafer.  [STEP 38]
  • Took another round of photos
  • Perform Exit Steps/ Exit Chamber steps
• 1:30:  HAM4 door installed by Vacuum Team  [STEP 39]
• 2:00:  HAM4 sealed & in-vacuum task COMPLETE

Starting CP3 fill. LLCV enabled. LLCV set to manual control. LLCV set to 50% open. Fill completed in 90 seconds. TC B did not register fill. LLCV set back to 20.0% open.
Starting CP4 fill. LLCV enabled. LLCV set to manual control. LLCV set to 70% open. Fill completed in 3197 seconds. TC A did not register fill. LLCV set back to 43.0% open.

   Installed the filter mounts under the PSL table. Given the tangle of cables and plumbing it will be necessary to rework this area to relieve the strain and entanglement of these cables and plumbing. A separate work permit will be filled for these activities. 

   The photos below are of before and after mounting the filters.  

Damping completed and flanges back on. No hitches. Three viton corks are in, preliminary laser vibrometry looks good. More later.

Gerardo, Vinny, Robert

GariLynn Billingsley, Travis Sadecki, Betsy Weaver, Calum Torrie, Nicki Washington (and a BIG support crew)

ITMx inspection with green light and portable microscope revealed several scattering sites. The center most sites were located high and right of center. (Camera images will be attached soon.) One of these (the brightest / closest to center) is shown in the attached picture. It measure roughly 0.5 mm across the halo.

There were many scatter sites of the same character all the way out to the edge of the optic. At the edge we attempted to clean one of these sites using the following solvents (IPA, Acetone, red FC and clear FC) without success.

Following this local cleaning and the overall inspection we then cleaned the entire HR face as per normal procedures i.e. with red first contact (FC) spray along with the cone etc ....

Subsequent inspection showed no change to these scatterering sites.

For full chamber report see alog by Betsy.

GariLynn and team.

HAM4 chamber was open (door off) from roughly 10am - 2pm.  The actual job of swapping out a TCS lens, taking photos, and adding a Contamination Control wafer went smoothly and fast.  The only time-consuming issue was taking the transfer functions for SR2 & HAM4ISI (but Kiwamu, Betsy, & Jim eventually gave us a clean bill of health).  I will make a more thorough entry later.