Corey and crew finished work in HAM4 around ~1pm, while we continued to inspect and clean ITMx in a variety of ways.  Around ~3:30 we (BSC3 crew of Travis, Calum, GariLynn, and I) determined that we should close up as cleaning wasn't removing all that we saw (see Calum's alog).  Travis, Jim and I worked through the procedures to restore the ACB, ISI, and ITMX QUAD suspension, removing tools, wiping our way out.  We then ran quick TFs on the sus and ISI which showed good and free results.  Signatures were obtained of a few management staff still on site as a cross check that we are able to closeup.  The door crew is finishing with the BSC3 door.  Gerardo and Robert will next attempt the MCA1 baffle "grounding" through a port on the reduction flange near HAM2.  Pumping down will commence tomorrow morning.

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.

TITLE: 05/09 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:

All employees not essential to the chamber work have been sent home due to an emergency event near the Hanford Purex plant. (http://www.hanford.gov/c.cfm/eoc/?page=290)

- Door is back on HAM4.
- Betsy is taking transfer functions for BSC3.
- Work on baffle by HAM2 has not started.

LOG:

14:43 UTC Jeff B. to cleaning area and LVEA to prep for plumbing work
14:53 UTC Ryan patching alog server
15:11 UTC Jeff B. back
15:18 UTC Student to see Mike L. through gate
Notice for Hanford 200 E area to take cover
Karen to end Y
15:29 UTC Jason starting PSL diode current adjustment
15:32 UTC Door coming off BSC3
15:40 UTC Cintas through gate
15:43 UTC Christine to end X. Jim took all ISIs to damped.
16:05 UTC Apollo and Coca Cola through gate
16:10 UTC Door is off BSC3
16:17 UTC Greg taking tour to bridge
16:21 UTC Corey to LVEA
16:22 UTC John to end X
16:31 UTC Filiberto to CER mezzanine to work on documentation
16:36 UTC Jeff and Jason to PSL to install bracket
17:20 UTC Aidan to LVEA
17:36 UTC Paradise water delivery
17:43 UTC Stay inside notice from Richard
18:44 UTC Filiberto out
20:29 UTC Vern and guest to LVEA
21:22 UTC Corey reports door is back on HAM4
22:28 UTC Restarted all nuc display computers per Carlos' request

We were suspicious of a vacuum leak in X-beam manifold (see previous aLOG), but it may be a failing ion pump (half of the pump). Attached is a year scan of the two signal currents. We swapped out the old power supply with the new style. Pump current is relatively high ~700 uA vs. 90 uA on IP5.

We will continue to leak check this evening while we're set up for it. So far we've sprayed GV7, the Balzer RGA with long lever arm, and a couple ports and flanges. No leaks detected.

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.

Email from Richard:

The Hanford EOC has issued a work release for non essential personnel.  If you are NOT associated with the chamber work you should leave the site.  Hanford has requested we take route 10 to the 240 route to exit the area.  All of the site North of the Y-Barricade is being released so you may want to depart sooner than later.   We have been given permission to restore the HVAC.

Please drive safe as traffic will be getting heavy.

Richard for Mike and John

I reset the PSL power watchdogs at ~15:45 UTC (~8:45 PDT).  This completes FAMIS 3649.

I adjusted the HPO pump diode currents as per FAMIS 8421.  All diode currents were increased by 0.1A.  The table below summarizes the changes and the attached picture shows the PSL Beckhoff PC main screen for future reference.  This was done with the ISS OFF.

I also adjusted the pump diode temperatures.  The changes are summarized in the table below:

The HPO is now outputting ~168.5 W.  The ISS has been turned back ON.  This completes FAMIS 8421.

WeeklyXtal plots show evidence of trips due to the thunderstorm m last Sunday and also the NPRO failure last Thursday. Typical humidity tracking of amp diode powers are normal. There may also be some anomalous data from Thursday regarding the ISS not being locked for a period of time.

Attached are scans from this morning and also from a couple weeks ago. Note that today the filament had only one hour to warm up, but the scans look the same.

[Gerardo, Chandra, Kyle, John]

• Vented vertex in two hour span. Purge air dew point measured between -35degC and -43degC before, during, after. Leaving the purge air valves closed overnight (pressure currently reading 834 Torr, or 1.4 psi over sea level atmospheric pressure (weatherbug reports 30.01" (764 Torr) barometric pressure)). We also removed all but four bolts from BCS3 & HAM4 doors.
• Cetec valve on IP1 is leaking. See attached trend of all four IPs that were isolated in vertex. Kyle and I went back to tighten all four valves; was able to turn each by 1/4 to 3/4 turn. These valves need to be replaced!
• Noticed that the pressures in the adjacent volumes - X&Y beam tube manifolds - show opposite trends in pressure change after hard closing GVs 1,2 and soft closing GVs 5,7. The X side rises and Y side decreases. You might expect it to rise due to the loss of cryopump action, or you might expect it to fall due to a 2500 l/s IP pumping on a relatively small, vacant space. Maybe one IP is more effective than the other, or maybe we have.....................a vacuum leak. Kyle prepared the area for leak checking. However, looking at a year trend, the CC gauge on BSC2 shows continual decrease in pressure. We don't fully trust these two new full range hot ion gauges that exhibit odd behaviors in trending. They seem overly sensitive to water vapor. We first noticed this when the temperature in LVEA was increased months ago. To help troubleshoot, applied 5 psi more pressure on soft closed GV 5 piston (y arm) to test whether the o-ring was in full contact. Will trend pressures tomorrow.
• RGA scan was taken this morning before vent preparation. Will attach in a separate log entry.

The vertex section venting, door preps, cleanings, and staging of the HAM4 North door and BSC3 West door went well today.  We'll have an 8am vent prep meeting tomorrow morning and then we'll be ready to pull the BSC3 door.  There are a few more morning preps but we did all that we could today, we are officially on page the Tuesday steps of the vent plan E1700124.  Both doors are hanging on 4 bolts overnight tonight.

TITLE: 05/08 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: Started the shift by taking down the IFO. The followed the vent plan from step 17-21. Accepted all the safe.snap SDF diffs. Left the ISI SDF diffs alone since it's showing the OBSERVE.snap rather than safe.snap. See attachment for details. 

LOG:

15:00 Took IFO to DOWN manually

15:04 Bubba -> LVEA (clean room setup)

          Apollo to EY

15:12 PSL/ALS light pipes shut, CO2 controllers keyed off

15:14 turn off BRSY

          Set ETMX ESD BIAS OFF, Leave ESD BIAS ON with opposite sign.         

15:18 Accepted SUS-IM SDF diffs but forgot to take a screenshot

          Mistakenly took HAM4 and BSC3 ISI to OFFLINE instead of ISI_OFFLINE (followed the older version of the vent plan document), fixed this later.

15:30 Jeff B out of the LVEA (staging)

15:49 Switched the rest of the ISI to NO BRS (I later learned that there's none at the corner station)

15:59 Vac team closing gate valves.

16:04 Fil to LVEA (disconnecting HWs cables)

17:10 Hugh locking down HEPI

17:24 Fil done

18:07 Fil replacing ESD HV power supply at EX

18:30 Hugh back, HEPIs are locked

19:19 Fil taking a lunch break

19:57 Fil back to EX

20:44 Vern+Jeff to HAM4

20:48 Fil done. Heading to CER

20:53 Vac team starts removing bolts

21:07 John driving to EY checking on Apollo.

21:30 John back

22:07 Jeff out of LVEA

22:10 Vern out of LVEA

The ITMX and HAM4 HEPIs were locked this morning.  Attempted to lock them at the nominal isolated position but that never works perfectly.

HAM4 diffs for position are 2, 13, & 44 um for x, y, & z.  For rotations the diffs are 2, 5, & 2 urads for RX, RY, & RZ.

For the ITMX, the isolated vs locked position differences are 58, 48, & 51 um for x, y, & z.  For the rotations the differences are 15, 16, & 16 urads for RX, RY, & RZ.

Not terrible but they should be close enough such that Jim won't have a real difficult time locking the ISI and Betsy will be able to set EQ stops.

Since Friday's storm every lock shows software saturations in NGN-CS_CBRS_RY_PZT1/2_CTRL. These channels seem to saturate for about 85 seconds, then stop saturating for about 50 seconds before saturating again. This trend has continued throughout the weekend. Here's the summary page link: https://ldas-jobs.ligo-wa.caltech.edu/~detchar/summary/day/20170505/detchar/software_saturations/