ZM path was redone.

After centering the beam on SR2 and on the OFI, HAM6 iris closer to HAM5 was temporarily removed to the side.

ZM2 was adjusted so that the beam is centered on it while the reflection goes to the center of the HAM6 iris closer to VOPO.

HAM6 iris closer to HAM5 was put in place, it went to slightly different location than it was originally at, but that's perfectly acceptable.

First round of OMC path realignment convinced us that the rest could be done in HAM6 after the corner is pumped down.

We checked the beam position in HAM6 in the OMC path and moved OM1 and OM2. What we did is mostly consistent with what I wrote in alog 39504 right after the septum window was rotated 180 degrees:

• OM1 was moved by about 14mm in -X direction so the beam from HAM5 is centered on OM1.
• OM2 was moved by about 20mm in +X direction.
• OM1 was rotated to center the beam on OM2 (in YAW only, we didn't have working OSEM so no PIT adjustment was made).
• OM2 was rotated to roughly center the beam on OM3.

After this,

• Incoming beam from HAM5 was 20mm away from the edge of the OM2 cage.
• OM1-OM2 line was about 19mm or so away from the edge of the OM3 cage (not too sure about this number, as I was looking at the beam mid-air and it was impossible to use the ruler without blocking the beam from HAM5, but I believe that it was larger than 15mm).

As soon as we put the fast shutter in place, though, it was apparent that the beam from HAM5 was too close to the fast shutter structure (see attached). This could be mitigated by pushing OM2 back into -X direction by 10mm or so. This will push the OM1-OM2 line by about 4mm or so in -X direction at the fast shutter position, so the clearance will be that much larger, and the clearance between OM1-OM2 line and OM3 cage should still be OK.

Before we actually did this exercise we were afraid that there would be no good solution because of the fast shutter unless we push OMC in -X direction, but we convinced ourselves that moving OMC is unnecessary.

OM2 is in its non-final location, and it only has two dog clamps right now because the original dog clamp was too short for this new position. We might need a longer one.

What needs to be done after pumping down

Lock IMC and send a stable beam into HAM6.

Reposition everything so that the entire beam path has OK clearance from any edge (push OM2 in -X by 10mm or so, rotate OM1, rotate OM2, reposition fast shutter).

Rotate OM3.

Fine-tune to send the beam to both of the QPDs on OMC. For this, we probably have to remove OMC shroud.

Reposition OM2 transmission beam dump.

Move all mirrors/lens/ASC-AS_C in OM1 transmission path by 14mm in -X direction.

Do the OMC REFL path beam dump properly.

(Kyle R, Gerardo M)

Last night while doing some work around the HAM5 I noticed the door cover for HAM5 being "sucked in" (see photo), that occurred every time someone removed the door cover to any other HAM chamber (4,3 or 2), it turns out that the new cleanroom creates great positive pressure causing the door cover for HAM5 to appear as being "sucked in".  So I ran a little test, while one of the other door covers was off and HAM5/HAM6 door covers on, I pushed some of the cleanroom curtains open, and that relieved some of the positive pressure created by the cleanroom HEPA fans, that allowed the purge air to "balloon" the door covers on HAM5, and as soon as I closed the curtains the door covers went back to getting pushed in towards the chamber.

Today Kyle and I used a long ladder to get access to some of the HEPA fans, there are 20 of them on that cleanroom, we dialed down 7 of them and there is a noticeable difference already, we plan to dial down some more tomorrow as work on that chamber allows it.

Noted that at about 10 am - 10:04 am PST on top of End Y, the anemometer was pointing to about 20 deg to the -Y of +x and that sensor is not moving very smoothly.
The sensor is on the upper roof, about 1/2 way along Y, and about 8 feet from the +x edge, and about 6 feet up.

10 am = 1196013618 for 600 sec - epics data says that EY is about 360. so this is = north
Perhaps the EY sensor is aligned with north, but need to recheck. 

tconvert 11:00:00 pst -> 1196017218

at 10:59 am, the EX sensor was pointed in the +x direction. It then moved to point in the -Y direction. 

at GPS time 1196017200, the direction reading for EX is 183 deg. 
at ...17254, it moves up to 271 degrees. I think this means that EX wind direction is aligned with the observatory coordiatates. That wind coming from the +x direction reads +180, and wind coming from the -Y direction readys 270. This is not crazy, since wind blowing from -x towards +x would read 0. 

The EndX direction monitor is moving smoothly. I also note that the black hat thing has come off. looks like it used to cover a wire wound resistor and a toggle thing. I do not know what it is supposed to do, but it will probably be happier with the cover replaced. 

S. Dwyer, K. Kawabe, J. Kissel, B. Weaver, G. Moreno, C. Vorvick

We've completed the by-hand alignment work needed with the PSL beam, picking up where we left off yesterday (LHO aLOG 39553). That means, we've reconstructed an alignment (using steps 1-11 in LHO aLOG 39547) to get a well-aligned PSL beam from the IMs, centered through SRM and coming out of the OFI well, and then repeated steps 12-14 from LHO aLOG 39553 which where unsuccessful yesterday: 
(12) make sure ZM2 was well aligned by
    (a) inserting the temporary half-wave-plate into the output apeture of the OFI faraday rotator, then
    (b) mechanically adjusting ZM2 to hit the last (most -Y, closest to the future VOPO) iris on HAM6 as shown in Figure 4 of E1500469, then
    (c) sealing in the alignment reference by placing the other iris (most +Y, closest to HAM56 septum) in the beam path and aligning it to the beam.
(13) make sure that SRM is well-aligned by 
    (a) first mechanically adjusting the alignment *some* this morning with the aux laser -- see LHO aLOG 39556, then 
    (b) further mechanically adjusting the alignment the *rest* of the way, using the well-aligned PSL beam, then 
    (c) fiddling with the sliders, until we see fringing patterns at SR2 with the SRY cavity aligned again. Because Betsy is awesome, we see fringing with zero digital alignment bias on SRM. BOSS!!
(14) make sure that PRM is well-aligned by 
    (a) driving it digitially with slider bias,
    (b) looking for fringe fringe patterns at one of the ITMs (we chose to misalign ITMX, and look for fringing on ITMY from the PRY cavity)

(note, chronologically, today, we did steps 14, then 13, then 12).

Attached is a screen shot of OSEMs and sliders once we got SRM aligned, and SRY was flashing. PRM and ITMX are mis-aligned during this screen shot: their slider values should be PRM -995.6 in pitch (yaw should be as shown), and ITMX should be +189.3 in Yaw (pitch should be as shown).

Notes: 
- We're still using only one set of cables to control the OFI, OMs 1-3, or ZMs 1-2, and they all are fed into the CDS system as OM1. We had last used that set of cables to test the OFI (see LHO aLOG 39033). Which means when Betsy and Travis plugged in that set of cables into ZM2 to align and center ZM2's OSEMs this morning, the control system was still configured for an OFI. I've fixed all that, and it's now working as a standard HTTS, and we've confirmed that we can push ZM2 to steer the beam as needed into HAM6, AND, I've confirmed that damping works (though just with a quick look at the MEDM screen). I attach a screen shot of ZM2 functional in the OM1 infrastructure, functionally running as an HTTS.

- As of writing this log, Keita, Sheila, and Gerardo are still out there making the changes to the OM1, OM2, and OM3 alignment, as described in LHO aLOG 39504. I attach some notes about their re-assessment of the plan this evening, which had to be re-measured because LHO aLOG 39504 was thought out before the septum window was rotated.

Great work again today team, and good luck to those still out there!

While alignment work was happening in other areas, Travis and I worked on getting the ZM2 OSEMs useful.  Fil and Richard helped me hook ZM2 satellite cable up to the OM1 since the ZM2 medm is all white.  We took the OLVs and then set all 4 BOSEMs to the 50% OLV mark. 

Note, since the cables between the rack and the chambers have not yet been run, we will have to move the 1 temp cable between boxes, one at a time for OM1, OM2, OM3, ZM2, and the OFI during the imminent closeout testing.

smoke test at EndX - Brian Lantz, Jim Warner, Siddhesh Pai, Brijesh Pant
Nov 29 2017, about 2:08 pm local
used 1 2B candle from superior signal

burn is ~60 sec.
https://youtu.be/XbouhfAK1Mg

smoke candle is ~10ft in front of the fence,

The smoke candle is about 11 ft. up off the ground, close to the vertical center of the fence material. The picture below shows the pole we used w/ Jim as scale standing next to the fence - The smoke emitter will be placed at the height of the blue tape on the pole.

We took several videos, the one from Brian's phone is linked above.

The smoke trail clear to the fence, but often difficult to see downstream of the fence. Why?
1. partly due to blue sky behind early trail and clouds behind late trail. note this for future film angles
2. trail is darker behind fence - might be some shade?
3. trail is getting bigger.
4. the place where the candle burned though was next to the post.

 - next tests we might try 2 candles together, and try to shoot against blue sky. i'm not sure I have enough candles to use 2 each for all my desired tests.

We see that the smoke moves through the fence. It seems like the fence might be "softening" the edges of the trails my generating lots of short scale mixing, but the structure at the ~1 foot scale seems unaffected by the fence.

Is the air moving more slowly behind the fence? Maybe? I sort of looks this way, but I can't understand how this would be true, if none of the air flow is getting diverted up-and-over or sideways-and-around the fence.
1. It is not going up over the fence -> if you assume the same density, then conservation of mass suggests that the speed on the two sides needs to match.
2. It might be slipping sideways instead of going over - this could allow slower speeds and would not be visible from this camera view -
3. It sort of looks slower - this could be the result of the smoke getting further away from the camera as it moves downwind. how to watch for this at EY?
 - maybe have a camera on the ground at the corner of the building looking up?

4. The structure of the plume moves right though this fence. The fence can't be adding large, immediate changes to the vertical velocity

More videos and pictures will be added, and we are planning to do some additional tests on Friday.

Jim set up an anemometer a bit (something like 50 feet) upwind of the fence to record the wind speed. Data download is pending.

TITLE: 11/29 Day Shift: 16:00-00:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Planned Engineering
LOG:

16:48 UTC Terry to squeezer bay, laser hazard (all day)
16:49 UTC Peter to optics lab
17:22 UTC Nutsinee to squeezer bay
17:37 UTC Kyle to mid stations
17:38 UTC Rakesh, Brian and Jim to end X
17:39 UTC TJ to LVEA and then optics lab
17:40 UTC Betsy and Travis to LVEA, start of SRM alignment
Filiberto to CER, cabling for ZM2
17:57 UTC Kyle to end stations
18:09 UTC Hugh to HAM6, CPS shortening issue
18:33 UTC Karen and Vanessa to mid Y to clean
18:37 UTC Kyle back. Kyle and Gerardo to LVEA to check orientation of gate valves.
18:37 UTC TJ out of optics lab
19:00 UTC Jason to HAM5 to build AWC mounts
19:09 UTC Peter out of optics lab
19:16 UTC Rakesh, Brian and Jim back
19:28 UTC Kyle out of LVEA
19:29 UTC Karen and Vanessa leaving mid X
19:50 UTC Greg to TCSY table
20:24 UTC Keita and Jeff K. to LVEA
20:37 UTC Travis and Betsy back
20:38 UTC Jason back
20:47 UTC TJ to optics lab
20:58 UTC Corey taking guest on tour through LVEA
21:03 UTC Betsy to LVEA
21:15 UTC Jim and Brian to end X to take videos of smoke trails
21:48 UTC Betsy and Richard to CER
21:54 UTC Corey back, taking guest to overpass
22:09 UTC Gerardo to HAM5
22:51 UTC TJ back
22:54 UTC Jim and Brian back
23:00 - 23:38 UTC Site weekly meeting
23:52 UTC Hugh to HAM5, cabling for OFI

All doors that were removed (HAM2,3,4,5,6 N and S, and BSC 3 and BSC1 biergarten side) had proper viewport protectors on them either already, or when the tables were disconnected and removed.  See pictures of all doors that are hanging around LVEA, removed from chambers.

This assay is in response to something LLO brought up in FRS https://services.ligo-la.caltech.edu/FRS/show_bug.cgi?id=9479

The TCS CO₂ tables have had the new periscope optic mount installed. Y-arm required a small modification to allow parts D1600106-V1 and D1201310-V2-01 to fit together. These new pieces have not been aligned to the table, or in-vacuum as yet.

FAMIS 6926

ETMY_ST1_CPSINF_H2 and ETMY_ST2_CPSINF_V2 are elevated.

Plots posted for end X and end Y. All others ISI platforms are locked.

Travis and I spent the morning realigning the SRM suspension in order to bring the pitch up onto IFO beam paths.  We used the red visible AUX1 laser to do this since it was much easier to hunt in the HAM4-5 Tube.  After walking the ~3" diffuse beam around everywhere we finally managed to set it on the right path.  We realigned all of the OSEMs which then saw this repointing and then looked at a few quick TFs to see that it still looked free.  We're handing back off to IR alignment team who are re-mapping the PSL beam to HAM5 for continued OFI alignment.

FAMIS 6551

Added 200 mL H2O to the crystal chiller.

The fault light on the diode chiller is not lit and the water level indicator on the controller screen indicates the water level is OK.

The canister filters appear white and free of debris.

Since the reflection of IR beam on septum window AR is so small, we shot a red laser pointer beam from HAM5 through septum so the beam clears the HAM6 iris closer to HAM5, and falls on the second iris closer to VOPO within a mm from the center. Sheila calculated the deflection difference between IR and red, and it's so small it doesn't make much difference over the lever arm (a meter or two) in this case.

There were two beams coming through the septum, we took the first one (brighter, and towards +X) as the main beam.

There were three beams reflected off of the septum into HAM5. We took the first two towards +X as the main beams to dump.

We also confirmed that the scribe mark showing the thickest side of the septum is -X for the ZM path and +X for the OMC path.

Pictures will be added later.