LN2 delivery
fire alarm test for H2 PSL enclosure
Paradise Water delivery

There should be two dust monitors in the clean room at end Y with the test mass. The signals for counts > .5 microns are H0:PEM-EY_DST1_5 and H0:PEM-EY_DST2_5. Their alarm levels are currently set at

> 0.3 microns minor: 100 major: 200
> 0.5 microns minor: 100 major: 200

They have been added to the strip tool running on the operator's station. There will be heavy mechanical work going on there to combine the two BSC chambers, so it is important to watch these and alert the crew at end Y if they spike.

Greg, Dan, Cyrus, Jim, Dave

We completed the restoration of H2 DAQ by running the multimode fibers between both h2fw0's QFS writer and the "MSR" Sataboy to the Qlogic switches. h2ldasgw0 and h2fw0 were then turned on. Dan took a look at the systems, all are working correctly. h2fw0 is writing frames again. We will now check to see if the frequent crashing of h2fw0 with 16Hz data corruption problem is still present.

Richard, Cyrus, Jim,  Greg, Dan, Ken, Dave

We moved the DAQ rack from the computer users room and the two H2 racks from the MSR to the new H2EE building. Networking (CDS and GC) and IRIG-B cables were installed. The MSR Sataboy RAID for h2fw1 and its fiber channel switches were also moved from the MSR.

All systems were powered up with the exception of the primary frame writer h2fw0. On first inspection all system appear to be operational apart from the LDAP server. Items to be completed are the connection of the LDAS fibre optics switches, the primary frame writer, the LDAP server and the tape backup system.

Attached are plots of dust counts > .5 microns.

We did a Differential Elevation Survey of the BSC8 Optical Table this afternoon.  Attached is my survey note page(just the right side.)

We observed the mon TP202 (see T1100187) which was surveyed wrt BSC2 way back.  Then looked in the chamber where Jim held the rod up against the Optical Table.  We took several shots.   I then kicked a leg of the Level and shot again and turned back to the starting monument.  My survey closed to within 0.1mm--this means I at least didn't read any numbers wrong.
All the elevation on the Optical Table were within 0.5mm.  This is good in that we leveled the Support Tubes from the outside quite awhile ago and have since pulled the iLIGO CAS stack and swapped in HEPI and the Crossbeams are currently sitting on mechanical stops.  I wouldn't have been too surprised if the table had been more out of level. I believe this puts the table very close to our requirement of within .5mrad level.  This of course can (will?) be repeated once we float the optical--we certainly can get it more level.

The average of the 5 shots on the table is 1662.6mm above BSC2(0,0,0).  That is in local elevation.  We subtract 0.1mm to put that in the Global frame.

I don't know what the Optical Table elevation should be at this point, which is good, that way you know I'm not cheating!  I'll look into this or ask someone and update you all soon!

Angus, Travis & Jason
Travis finished welding ETMY and it is hanging. 4th fibre was touched by a weld mirror so we replaced it. S1106462 was used in HR side left and S1106435 on AR side left (looking from HR side). We were aiming for a differential pitch (down) of 0.6 mrad and Jason measured 1.6 mrad (down), the centre of mass separation derived from the ears(?) is 602.0 mm.

More images to follow (we'll get an entry at ResourceSpace), but for now, some images from Betsy and myself of the Friday cartridge work.

I have started the shutdown of the CDS aligo H2 racks in the MSR and computer users room. The H2 DAQ is down. The H2 workstations will not be responsive because some file systems are down. We will complete the shutdown first thing tomorrow morning before moving the racks to the H2EE building.

The FTIR results are back for aHAM11 and they look good: all post work samples read below detectable. Please see the reports attached. *Note that this is one of the two chambers where there was possible contamination. 

The ITMY/FMY cartridge was successfully flown today from test stand #2 in the LVEA and deposited into BSC8. The ITMY SUS fibers were confirmed afterward to be intact.  We found the payload (including ISI, the 2 SUSs and limited rigging) to be 9260 lbs, well under the crane limit. 

We will log more details, including photos, in coming entries.

Attached are plots of dust counts > .5 microns.

Doug, Jason, Travis and Angus spent the afternoon welding in the first two fibres on ETMY. The ETM is currently set with approximately 600 microradians pitch down. Both welds were straightforward with no particular issues. S1106461 is welded in position HR side right (looking from HR side), S1106459 is at AR right (looking from HR side).

We had our first Sataboy RAID disk failure yesterday. H2 DAQ MSR SATABOY disk 7 (counting from 1) failed. Dan replaced with spare 2TB SATA disk, it is now rebuilding the RAID6 using the new disk.

Main entries have a link in the upper right corner such that one can provide direct links to log entries in emails, etc. This should also be the case for comments. Perhaps it's best if the link takes you to a page that has both the main entry, the comment itself, and any other comments associated with that entry (I fear that a direct link would show *only* the comment on the resulting page, like it does for the main entries -- I don't want this, it's imperative to see the context of the comment). However, the comment should somehow be highlighted to show that "it's *this* comment I wanted to show you."


On a related note, if you try to link directly to a comment by replacing the "callRep" at the end of any normal entry's URL for with one for a comment the page turns up blank.

i.e. Take the URL for entry 1874,
https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=1874

and replace the callRep for the corresponding comment to that entry,
https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=1880

and you get zilch.

We rerouted the fiber optics line from the H2DAQ out to the LVEA via the H2EE building. All fast channels are now back in the DAQ.

This afternoon a CDS multimode fibre optics cable was pinched against the cable tray near BSC8, causing the fast DAQ data from the LVEA to be stopped. For the rest of this week the aligo DAQ will record EY channels and slow channels from the LVEA. On monday the H2 racks will move into the H2 EE building and the missing DAQ channels will be restored. 

This afternoon, after the final B&K hammer measurements were complete, and SEI locked the ISI and began their preps, I began securing the FMy and ITMy for lift-off.  Because the First COntact that was on the ITMy HR was many months old, and had been peeled down for IAS purposes numerous times over the last 2 months, I removed it and put a fresh coat on, including a new tab at the top.  I observed a lot of particulate on the optic after the peel and attempted to remove them with alpha swabs and the N2 gun (gun also used intermittently during FC removal).  This was cumbersome and while doing it I (and Corey over my shoulder) noticed some streaking pattern not from the First Contact, as well as some First Contact PEEK mesh patterning on the optic.  More pictures to come.  So, I gave up on the dabbing and blowing and reapplied the new FC coating.

Then, I secured all of the EQ stops on both the FMy and ITMy, with the exceptions of:
- 2 nuts (missing) - one on each UIM side stops, and
- the ITMy Top Mass Blade Stops, which require removing the Top Mass BOSEMs.  The masses and blades above and below are rock solid however, so this is fine.

I then added the new "finger" assembly which acts as a 20mm gap stop between the ITMy AR and the CP HR.  This assembly, however hangs down below the QUAD structure and may be a problem for the cartridge, but is easy to remove tomorrow if needed.

I also added the transport pins to the vibration absorbers on both suspensions.

I covered the FMy.