HughR, HugoP, JimW, some sus people...

We attempted unlocking and level Stage 2 of the ISI today. The unlock went well, but we were unable to balance the stage. Access to the walls of Stage2, where the balance mass would go, would normally be difficult at best, but in this case it was completely blocked by the Arm Cavity Baffle. Our CPS's indicate that the payload is light, with all sensors reading a few thousand counts high. This is especially true in corner 2, which is currently reading ~14000 counts. That translates to around .003-.004" high. We currently plan to bolt a couple of SUS's large dog clamps to the table as an improvised ballast. Should be a quick fix first thing in the morning. We do have masses designed specifically to mount to the optical table, but we have none of the smaller sizes on site. Even then, the smallest of those masses are 2.5 kg (~5 lbs) which is likely too big to fine tune the balance from the optical table.

[Jeff B, Deepak K, Andres R and Gerardo M2]

Monday & Tuesday 23rd/24th April 2012

 - The wires for the lower mass was assembled and assembled to the intermediate mass.

 - The Lower mass was hung on the loop after properly placing the wires in the grooves.

 - The intermediate mass is then hung on the lower blades.

 - The Lower blades are then hung freely from the upper blades.

 - The masses were initially aligned and now waiting to be properly aligned.

 - The suspension is fully assembled and all the masses are freely suspended.

May have affected dust counts in OSB labs when stopped and when restarted(?)  

Found that the pitch actuator ram operates normally when decoupled from the fan variable pitch/vane assemblies (toggling power with 4-20ma signal removed resets position counter and causes ram to fully retract.  Re-landing 4-20ma signal wires, once reset, allows remote control of ram position).  

The exhaust variable pitch/vane assembly is easy to manually stroke through its range when mechanically decoupled from the actuation system but the intake variable pitch/vane assembly feels dry and has excessive friction.  It is quite difficult to stroke through its range even whilst decoupled from the actuator/crank/exhaust vane.  I had to use a heavy sledge hammer and "tap" with authority to get it to stroke and to change pitch -> For now, I manually left the pitch at reduced flow from the "as found" state then re-coupled everything but I did not re-energize the actuator ram.  As such, no remote pitch adjustment can be made.  The mechanical force needed to stroke the front pitch/vane assembly is too much for the 500lb max. force of the actuator ram.  Also, SF06 is "viby" when compared to SF05.

Frank Seifert, Jonathan Berliner

We deinstalled the eLIGO EX Pcal system this afternoon. Everything, except for the aluminum support structure, was brought to the LSB Optics Lab. The aluminum support structure was left outside of the End Station by the roll-up door, along with the other scrap. The viewport gate was left closed and the viewport window was not inspected. Though the viewport gate key isn't locked or tagged out (as shown in photo), there are assorted warning stickers on the viewport gate enclosure. Some beam dumps weren't clamped down...we should be more mindful of this in the future.

[Jenne, Jan]
We have started placing accelerometers and cables in the end station, so please be careful when walking near BSC10 and the old H2 racks and the dome.  All accelerometers have cones over them, so step around the cones.  All cables that are in the walking path currently are very short stretches, and are taped to the concrete with cleanroom tape (per Jodi's instructions), and are right near several cones.  

Anyhow, please respect the cones, and step carefully.  

On Monday Scott (Apollo) installed the Protection Shrouds on the HAM2 BNC FeedThrus--None of the other FeedThrus are very vulnerable so we didn't install the Shrouds there yet.
There is a "No Step" placard on the Shrouds--do please comply.

- De-install of BSC 1,2,3 
- Accelerometers being laid down at end station
- Unifirst came
- H2 Front End PSL shutdown
- Mouse and Key: Door Locks
- Mid Columbia:  Working on forklifts 
- Shutdown of H2 PSL front end

The deinstall progressed to the point where the lazy susan is in place, the lift table, teflon highway, and adaptor plate are in place.  However, the shoulder bolts for the tall dog clamps have gone missing and were not found.  Some alternatives were considered and rejected, so Apollo crew and Kyle have come up with an alternative that replaces the missing bolts.  The replacements are being cleaned and then baked overnight, so should be ready for use tomorrow, allowing us to complete the deinstall.

- Cheryl, Jodi, Zack, Caleb, Randy, and Mark D.

I am now running new dust monitor code on h0epics2, which is a Ubuntu workstation. It is running under screen.

There has been a bug in the previous code, such that data does not appear to have been recorded since March 15, 2012 for the following:

Dust monitor in clean room over BSC8
H0:PEM-LVEA_DST15_3     any data for counts > 200
H0:PEM-LVEA_DST15_5     any data for counts > 200

Dust monitor in clean room over test stand in LVEA
H0:PEM-LVEA_DST4_3      any data for counts > 200
H0:PEM-LVEA_DST4_5      any data for counts > 200

Dust monitor in OSB optics lab
H0:PEM-LAB_DST1_3       any data for counts > 20,000
H0:PEM-LAB_DST1_5       any data for counts > 8,000

Dust monitor in OSB bake oven room
H0:PEM-LAB_DST3_3       any data for counts > 20,000
H0:PEM-LAB_DST3_5       any data for counts > 8,000

This was because the audible alarms were set for these dust monitors at these levels. When these alarms went off a signal was sent which was read by the CDS code as an error. The CDS code then set the epics channel to INVALID, and the counts were not updated. This should be fixed in the new code.

 (Doug, Margot, Jeff)
We setup the Newport laser collimator and retro-reflected the beam from the First Contact thin film coated HR surface and measured the power both in front of the optic and measured the transmitted power through the optics (2 optics and 2 separate measurements) with and without the First contact. Measurements were taken at ~3M and ~6M distance from laser collimator to HR side of sample optics. Sample optics were coated for 1064nm with both HR and AR coatings and First Contact sprayed on the HR surfaces.
I didn't see a need to set up a BS and try to measure a true reflect from the HR surface. The small difference would still be int the absorption and diffused beam if present and is within usable range.
Parameters:
Newport laser collimator beam dia  ~3.0 cm dia.
Ophir power meter aperture 1.2 cm ²

optic s/n 11: @ 3.0 meters
power at 0º incidence in front of optic 44.4µW
power transmitted through First Contact 39.4 µW = 85.6% T
power transmitted through without First Contact 38.0 µW = 88.7 % T (higher reflectivity)

optic s/n 38: @ 3.0 meters and 6.0meters
power at 0º incidence in front of optic 42.4µW
power transmitted through First Contact 36.5 µW (3.0 meters) = 85.6 % T
power transmitted through First Contact 36.4 µW (6.0 meters) = 85.6 % T
power transmitted without First Contact 34.2 µW (6.0 meters) = 80.7 % T (4.9 % higher reflectivity)

No retro-reflections interference noticed.

"This may work"
Doug

Apollo (Mark & Chris) pulled the FeedThru (F2-2) to rotate it 180° to put the 'D' right side up in the usual way.  I didn't know the cables were attached and they were unable to pull them far enough out to allow the cable disconnect enabling them to put in a new copper gasket.  I went inside the chamber to disconnect the cables from the FeedThru.  Refer to D1003085 for flange locations and connection descriptions.
Few things here:
1) The In-Vacuum cables on F2-1 have screws for securing to the FeedThru but they were not secured.  I secured them; these would be the ISC-Picomotors & the Transmon 1064nm 25pin cables.

2) The In-Vacuum cables on F2-2 do NOT have screws in the cable and so they aren't secured.  As we flipped the FeedThru and flipped the cables, I felt it prudent to record the cable numbers:
2a) F2-2C1 (ISC Transmon 532 nm) Cable D1000924, S1104106
2b) F2-2C2 (ISC Transmon Beam Diverter) Cable D1000223, S1104077
I did not trace the cables back to the Transmon so don't know from whence they come.

3) While the FeedThru was install upside down from our usual 'D' faces down orientation, my concern about the in-vac cable possibly being installed incorrectly and damaging the FeedThru or Cable was misplaced.  The 25pin cable cannot be installed upside down.  That misplaced concern comes from the 3pin FeedThru where the Vacuum Side can be installed reversed wrt the outside--see the attached photo if you like.

I have removed the H2PSL from the following systems: H2 DAQ, h2boot and MEDM overviews. This applies to the H2 PSL front end computer and the Beckhoff control and monitoring computers.
This has closed WP3166

PSL installation team


H1 crystal chiller preparation: 
We found a leakage inside the chiller, which had been fixed now by getting out the flow turbine and preparing it with some teflon tape. Also, the flow has been decreased via the internal bypass valve (It needs to be below 30 lpm, otherwise the chiller would shut down). This valve needs to be readjusted, as soon as everything is connected.

Disassembly of the water supply from the laser head: 
The laser head (oscillator) has been emptied as a preparation step for getting out the pump fibers and (later) the laser crystals. The hoses and the water manifold are already stored in the H1 laser enclosure (but not mounted / connected yet)

Disassembly of the cabeling: 
We started to disconnect the cables on both ends, the racks and the components inside the LAE (laser heads, DBB, etc.)

The oscillator box has been opened unscrewed from the optical table. A big part of the optics between the oscillatot and the DBB and the Amplifier has been removed and stored on a breadboard, such that this breadboard can be moved over to the H1 enclosure. Thus, we are preparing some room on the table to get the transport frame attached to the oscillator (also, these components are needed in the new enclosure anyway.)

The pump light fibers had been disassembled and pulled out from the LAE. They are stored on the floor next to the LAE (the next step will be to get them out of the rail, running above the LAE roof)

After some serious hunting, Richard tracked the ITMy L2 problem down to the connection on the external side of the feed thru.  It was on the wrong 25 pin feed thru port.  I will re-cable the insides tomorrow.

Hanford Fire Department on site
Cleaning of OSB bake oven room
Migration of CDS network to new hardware

GregG, JimW

Today at BSC8 we hooked up the last of the HEPI actuators, mostly went off without a hitch. Greg should be posting our dial indicator shifts shortly. For future reference, making vertical adjustments to the horizontal actuators can be made with a small bottle jack. Just place the jack on top of the HEPI base clamp and put the top in contact with the underside of the actuator "shelf". 

After the actuators were hooked up, we went inside and looked at the level of the optical table. Need to confer with Hugh about the results, but it still looks pretty good. Could be as good as no more than a 0.1 mm difference across the table. I say "could be", as the measurement was a little difficult to make. It's hard to read a moving ruler through an auto-level.

A while back I complained about the fact that the chamber, after cleaning, becomes black-ish quickly to various people including  Dennis and MikeZ, and was surprised to know that they didn't know.

I talked with MikeL, RobertS and Jodi since then. This alog just restates what was already known by some experts.

All chambers seem to be covered with black stuff. Attached is the picture of the glove with which I swiped the inside wall of BSC6 last week. Robert looked at it to confirm that it is quite similar to what he saw when he went into BSC8 some time after chamber cleaning to measure the particle count. Jodi also showed me her glove sample from BSC6, which looked quite similar. It's reasonable to say that we're seeing the same oxidization process. Jodi also say that she didn't see this right after the chamber cleaning, but it develops within a few days.

A few notes:

1. You might think that the thing is grainy, but it's just that the high points on rubber surface are picking up the black thing.
2. Unlike i/eLIGO days, these black stuff is very fine, and you cannot shake it off of the glove. In i/eLIGO days, when you swipe the inner wall of the chamber, you often had some bigger, scaly thing which you could shake off, on top of something you couldn't.
3. Since Robert's study referenced above was done after the chamber wall already got covered with this black thing, and since it showed that the particle counts were a factor of 10 smaller than it used to be in i/eLIGO, there's no reason to believe that the particle count is back high again.
4. I and Robert observed the glove under a microscope, and they're almost pitch black. As far as we can tell the size of the black particles is much smaller than the resolution of the instrument. There were several clumps of black stuff, though.

We don't know if this is going to become worse with time, though, and I think it's prudent to ask Jodi to make an assessment of the chamber surface once in a while, i.e. to go inside, swipe using a glove and a wipe and keep them as samples, and also measure the particle count. Of course she's done these things, but make sure that it's done repeatedly over some time. A perfect opportunity is before we pump down the Y arm, and after one arm test concludes.

There might be other things, e.g. Robert and I talked about wiping a part of the BSC thoroughly clean, have Jodi approve it, swipe using a glove right after that, and leave the glove for a few days to see if it becomes black.