Linoleum was removed inside the grout dams and table legs were set inside, and leveled. We plan on grouting the legs into place tomorrow with hydrostone.

LDAS have replaced their aging 3511 disk systems (the ones fb0w uses) with a new Sataboy. The disk capacity has gone down to 18TB (from 30TB) but the new system will be immune to the disk crashes of S6. We copied the minute trend files across from the old disks, these are the only old DAQ data we will preserve. All other data (full frames, second trends) are starting from scratch.

So from nds0 which mounts the new disks, minute trends have a data gap from 08:46 Mar 16 to 11:50 Mar 21. All other data started from scratch at 11:50 today. If you need access to minute or second trends in this data gap, please use nds2 which mounts the fb1w system and which ran throughout this upgrade.

~9:00 – Michael and contractors began leveling the PSL table

~9:00 - Richard and contractor working at Y-End.

~9:30 – Kyle to begin venting RGA volume and remove RGA components from BSC6

Work throughout the day:
bins being moved around in the LVEA
HEPI installation continuing on BSC 7

I installed the ECD blocks on the R0 Top Mass/Tablecloth.  Attached is a plot showing the TF taken just before the addition, as a reference, and with the ECDs set to within a mm of touching the mass.  The green and black peaks are with the ECDs, and show significant attenuation of peaks.  We need to determine if the placement of the blocks is acceptable, or if they need some in or out adjustment. - Plot to be uploaded when test stand power is recovered.

With the new Sokkia Autolevel, I rechecked the level of the Assembly Test Stand sighting on the Upper Structure base surface which is a referenced flat in the suspension build.  (Recall that we re-built the solid stack which the suspension hangs from in order to open up assembly real estate and mount a cross flow HEPA.)  On Friday, I determined that the structure was out by 0.008" over a 17" length along the Y direction (perp to beam line of the QUAD).  This equates to 0.5mRad.  The Test Stand was designed to be level to within 0.2mRad as per T050113, so today I adjusted the Test Stand feet to bring it in to 0.13mRad.  A quick check on the beam-line direction which looked better than than 0.13mRad, so no adjustments made for that direction.  The BOSEM signals showed a little bit of swing due to this releveling (~100 counts), but no bigger than the daily temperature drift of the signals (where a few degrees soften(?) the blades over the course of the day such that BOSEM LEFT and RIGHT change in the same directions on both chains by ~500 counts).

Using the new HEPI alignment numbers BSC HEPIs 77 54 51 45 and HAM HEPIs 03 05 are now complete.

Grout dams were caulked into place, based off the layout Mick, Nicole and I set yesterday. These are only held into place by a bead of caulk, so take care not to kick them loose. Caution tape was set around the area. On Monday we will cut out the linoleum in the center of the dams and level our table legs.

Replaced IP12's non-working MultiVac ion pump controller with a DualVac controller yesterday and modified signal cabling pinouts to match.  Pumped X-end with MTP for awhile then switched over to IP12 (note IP12 status is still "RED" in CDS displays -> Dave B. will correct database parameters to match new controller's signal outputs before the next reboot at which point IP12 status will change to "GREEN" in CDS displays)

Spun down MTP at X-end and shut down QDP80 pump.  

Noticed IP6's high voltage output "FIXED" at 7000V -> Corrected to "STEP" output.  

Linoleum work was finished today. Contractor came on site and welded the seams. There were some concerns about welding the new linoleum to the old linoleum, but he was able to do it no problem.

[Corey, Greg, Hugh]

With new numbers, we went about setting the HEPI Foot to their nominal positions prior to installation.  This afternoon we made it through (2) HEPI's.  Tomorrow we'll finish the other two and then start on a HAM set.

Replaced both check valves at X mid station control air compressors
Ran well pump to fill tank
Re-started Staging building booster fan

Changed out the CS control air compressor check valves.

Linoleum put down in H2 PSL area
HAM8 was moved
Tumbleweed bailing

The remaining 2 pitchforks were assembled and put onto stage 1 today. What boxworks walls we do have were prepped with dowels and are sitting on the granite table.

The iLIGO primary framewriter (fb0w) was put into partial mode (not writing frame files) as LDAS upgrades this disk system. So only fb1w is writing frames, which are being served by nds2.

Please use nds2 for archived data until LDAS has completed their upgrade.

10:45 – Kyle to X-end to continue yesterday's work.

contractors moving beams around in the LVEA

~3:00 – tumbleweed bailing completed

[Corey, Greg]

Received (3) big plates for the BSC ISI and unloaded at the VPW

Transferred Pitchfork & Boxwork Stage1 Walls from the VPW to Staging Building.  Started pre-assembly work on these walls (i.e. pressed dowel pins and inserted helicoils).  Assembled (1) Pitchfork (and installed on Stage1 [just pinned to Stage1]).

Moved pallet of HAM-ISI#3 BAD plates out near Fire Water Tank lay down area.

This completes the site, i.e., all 80K (LN2) pumps now have mechanical differential pressure gauges mounted beside the 80K vessels on the same stand used to mount the CDS pressure/electrical pump level and exhaust transducers. These will allow us to have an indication of the 80K pump levels in the event of a power outage or other CDS failure.  

As labeled, 38" H2O equates to 92% full which is the nominal level for the site LN2 (80K) pumps.