Screenshot attached.

I measured the laser power at the base of the periscope this morning.  The power meter was located
in front of the mirror directing the beam upwards.

    With an Ophir PD300-3W-SH power meter (S/N 171141, P/N 1Z02411), the highest value measured
over a ~2 minute interval was 160.4 mW.

    With an Ophir 20C-SH power meter (S/N 1711175, P/N 7Z02602), the highest value measured over
a ~ 2 minute interval was 169 mW.

    Both readings were taken using a 10 second average, with the zero offset removed using the
Vega display unit.

J. Kissel, S. Pai

Siddhesh and I B&K Hammer'ed the new MC2 and PR2 Scrapper Baffles, SR2 Cage, and of Primary/Final/Large? in-vac TCS Steering Mirrors in BSC2. More details, pictures, and results to follow.

Notes for myself later: 
- SR2 cage accelerometer was oriented with X Y Z aligned with the IFO global coordinates. 
- All other measurements had acc Y aligned with IFO Y, and acc Z aligned with IFO X.

Today, Travis and I used the red visible AUX laser to final align the ITMY elliptical baffle and the BS AR and HR baffles.  (Note, we had already done the BS baffles and the ITMX but wanted to check and document.  Note, the front back, and center targets of the elliptical baffle boxes do not all exactly line up, but the tolerance is 7mm so we are center to better than that on all of them.

Also, note, the BS baffles do not look very centered on the mounting to the BS structure, but the beam is centered thru the baffle, so can't do much about that.

Pictures are attached.

This afternoon, while helping Jason install the new AWC optics, I worked on routing the AOSEM cables for the OFI.  Hugh had preassembled the D1000225 SRS cable to the D1000234 Quadrapus cable and mounted it in a cable table bracket.  So all I had to do was route it all on the table, plug it into the feedthru and start connecting AOSEMs.  I've plugged in 1 AOSEM and will start looking at medms next.

In LHO aLog 39484, it was reported that the WHAM6 Corner3 CPSs was sitting on a rail and it would intermittently come off the rail when the cables were messed with.  I managed to get the channels off the rail but V3 was clearly noisier than the others.

Yesterday, I worked the cables over to eliminate this and maybe succeeded.  The CPS cables are in the right turn port of the 5-way cross and one of the cables was looped back in the hidden turn and although it could not be seen, I suspect the copper shield was close to the BNC Bayonet and this was the source of the intermittence.  Pulling and twisting the cable un-kinked the loop and it looks like it should remain.  Difficulty here is that now that the feedthru is on the five way cross, there is no connection to break to aid in untwisting the run.  At least for the past 24 hours however it has remained stable.

The attached 10 day trend of the CPS locals shows the elevated noise of V3 and how all sensors have a similar noise level.  Also notice how the H3 signal has jumped onto the page during this work yesterday indicating that channel was also affected although it was not on the rail (32k cts.)  But, it was being influenced on the absolute level readout, that is, actual reported position.  When I trend this back to before the vent, the reading was never at this level and I think that the sensor must have been exposed to some erroneous signals which was giving a false position.  I will say that both channels are much better now!

Will update ticket 9477 to monitor these channels for a time before closing.

The figure below is a shot of the current positions after morning work. Cheryl has left for the dentist.

We can now hand off to Rick S. for ISS alignment.

IO work will continue this afternoon

J. Kissel, B. Weaver, S. Pant

After yesterday's connection of ZM2 to the single functional 4-OSEM electronics chain in HAM5/6 --> readout as "OM1", and re-arranging the control setup (i.e. changing the OSEM2EUL and EUL2OSEM matrices) from an OFIS to an HTTS, we were able to grab the first transfer functions functions of the brand-new HTTS in HAM5 -- ZM2. The results look excellent. The suspension is free, resonances look quite similar (read: close enough) to a previous reference of OM1, and the DC scale looks right-on target. Nice!!

I attached screen-shots of the results.

We'll wait for chamber close-out to really make these TFs official with the full matlab analysis suite, but for now, the new data (again, still using channels that claim "OM1" as the suspension) live here:
    /ligo/svncommon/SusSVN/sus/trunk/HTTS/H1/ZM2/SAGM1/Data/
        2017-11-30_1724_H1SUSZM2_M1_WhiteNoise_L_0p01to50Hz.xml 
        2017-11-30_1724_H1SUSZM2_M1_WhiteNoise_P_0p01to50Hz.xml
        2017-11-30_1724_H1SUSZM2_M1_WhiteNoise_Y_0p01to50Hz.xml

(Note that, in committing these to the SVN, I've created two new corners of the SVN to make space for ZM1 and ZM2).

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.