Gergorio, Rodney, Michael R

Today we moved the H2 spare chiller over to the H1 chiller room. We ran both upper and lower units in a closed loop with water filters for about an hour and a half to clean out any gunk that has been sitting inside. The diode chiller tank did have some algae in it but it looks like the filter took it out (see attached photo). We removed the broken chiller from the water lines and hooked up the spare chiller which ran with no problems. No leaks observed, so we went ahead and turned the laser back on. No problems getting it back on, but we still need to increase the diode current to get back some laser power.

We also unsuccessfully tried to fix the chiller by bleeding the pump per the manufacturers advice, but it had no effect. It may be a damaged flow sensor or clogged pipe.

Install reworked one-stop card in x1psl0 I/O chassis, start x1psl0 front-end.

Move the old x1login computer to x1work.  (New login machine is x1dtslogin)

Move /home on x1work to /home-original, then nfs mount x1dtslogin:/home to x1work:/home.  This allows users to log in, then ssh to x1work which is an Ubuntu OS configured to run the LIGO control room tools.  

We discovered multiple copies of awgtpman processes on some front ends. The duplication occured on Tues 26th Feb. For safety we restarted all awgtpman processes on all front ends.

The problem was discovered by the SUS team when they tried running their transfer functions.

Activities for today:
- Michael R. and Gregorio T., PSL chiller work.
- Christina C., Karen R., and Cris M. clean test stand area and BSC2 area in LVEA.
- Richard M. work in LVEA PEM related.
- Cheryl V. Work in and around WHAM02.
- Rick S. and visitors to roof, observation deck.
- Dave B. work in Mid-X.
- Rick S. and visitors to X-end.

Dome cleaned and returned to chamber.
Door and dome bolts torqued.
Pedestals removed from VEA.
Feedthrough and blank installation discussed.
Some ICC equipment moved back to corner.

Build custom bridge between work platform and e-module-Done
Install custom bridge-Done
Work on cleanroom curtains: "doorway" at bridge-Done
Install central curtains on garbing/staging cleanroom-Done
Clean chamber and cleanroom X 2- 1 done
Install leg jacks-Done
Test leg jacks
Move cleanroom from HAM aux optics table to BSC2-HAM3 for garbing/staging
Check cleanroom function
Stage garbing/staging cleanrooms
Baffle assembly (Clean test stand-solid stack to test stand ~28 Feb-work tables moved in-clean cleanroom and contents prior to assembly start-1 done)

Installed reworked one-stop cards in I/O chassis for h1seih45, h1sush56, and h1susauxh56.  Ran timing fiber for h1seih45's I/O chassis, connected timing fibers for h1sush56, h1susauxh56.  

Powered up I/O chassis, made sure timing sync'd up, then powered up computers.

All three computers show the I/O chassis' cards.  Dolphin network is currently unplugged from h1seih45 and h1sush56.

NOTE: no AI/AA chassis or binary cables are connected to the I/O chassis.

Since I removed the Dial Indicators yesterday I thought it would reasonable to document the numbers. I recorded the DIs before removing. I compare them to the last time I recorded them on 29 January after the HEPI Actuator Attachment. IAS followed shortly and Jason logged that the ITMy was within tolerance.

The dial indicator numbers suggest at worst a coherent rotation of about 180urads CW and a very slight tilt down(4mils) on the NE (+X,-Y) corner.  If this yaw is true, we are still in spec as Jason logged we were CCW 70urads.  However, the HEPI IPS which have been on line since Feb1 would suggest much less motion.  These suggest an up motion of <1mil all corners and incoherent horizontal moves of <1mil.  I would venture that the DIs have just not managed the duration without some disturbance.  So at worse we are still in spec and at best we haven't moved at all.

The SEI electronics wiring diagrams were recently updated.

Models were modified to reflect those changes on our Units:
HAM2-ISI
HAM3-ISI
HAM1-HEPI
HAM2-HEPI
HAM3-HEPI

Models were recompiled and wiring was checked. IPS readouts match values recorded prior to re-wiring. Turning sensor's interface chassis on/off is reflected on the correct channels. Actuation was checked on HAM3-ISI, confirming the DAC number for HAM2-ISI (only 2 DACs on HAM23 IO chassis).

Damping loops, and level 2 Isolation loops were closed, on HAM3-ISI. We used the latest blend filters created during the IMC test. Controls were not tested after the vent. The current stability of these controllers confirms both the new wiring/models and the robustness of the control loops, in Air.

Hence, these control loops will be used to help IO locking the mode cleaner during the upcoming weeks.

Moved the STS cable one AA chassis up for both HAM2-ISI and HAM3-ISI, in order to be consistent with latest wiring diagrams, and their associated models.

I replaced the broken fitting on the diode chiller today but it would not start due to a low flow error. The flow will reach a max of 2 lpm before shutting off after a few seconds. I short circuited the flow to the chiller and got the same error, so the issue is with the chiller itself. We'll likely need the spare chiller from the H2 room, but will have to flush it out as there is some algae in the water tank.

- Deepak, Kyohei, Travis, Cheryl

More dog clamp swaps and installation of components.  Some components were moved to allow new hardware installation in HAM2 .

Highlights of work completed:
- PRM AR Baffle installed
- PRM EQ Stop Baffle installed
- MC3 EQ Stop Baffle dog clamps swapped
- dog clamp mess in front of IM1 cleared up, though one baffle now has dog clamps only on one side, which is not ideal, so maybe some small changes still to come there
- dog clamp serial numbers and types collected

Still to do:
- modify IM4 baffle - didn't fit today, but slop in washers used as spacers may allow a fix
- FI rejected beam dump needs to be assembled and installed
- a few dog clamps to work on, less than 5
- OpLev optic still to install on North side of the table
- move one baffle, which requires climbing into the chamber on the South side
- pictures of the changes
- check alignment of every component!  Components moved without an alignment beam, so minor adjustments may be needed on multiple components.

The SE corner has now been swapped back to iLIGO SEI.  More to go tomorrow.

Bumping the DIs really don't matter at this time as they aren't logging anything.  Still try to not bang into them anymore than needed for their well being.

Found the leak I was looking for; it was lurking SE of HAM4.  The Apollo welder was fortunately available and repaired it early afternoon.  All the Valves have been opened again and the pressure brought back up to 125psi.  Will report tomorrow on how it is doing.

Build custom bridge between work platform and e-module
Install central curtains on garbing/staging cleanroom
Move cleanroom from HAM aux optics table to BSC2-HAM3 for garbing/staging
Work on cleanroom curtains: "doorway" at bridge?
Clean chamber and cleanroom X 2
Check cleanroom function
Stage garbing/staging cleanrooms
Baffle assembly (Clean test stand-solid stack to test stand ~28 Feb-work tables moved in-clean cleanroom and contents prior to assembly start)

FTIRs taken. Permanent BSC flooring installed. Doors returned to chamber.
Cleanroom placed over dome late yesterday afternoon. Dome and cleanroom cleaned today. Dome will be cleaned and returned to chamber tomorrow.

We accidentally glitched the Dolphin network in the MSR this morning while investigation a model which is running long. We had to restart almost all the models on Dolphin connected front end computers. The reason for the glitch is known and we can avoid it in the future.