Dust Counts in Bake Out--have called to inform them (will email justin if it happens again)

8:30 Unifirst arrives

Praxair--
-- arrived early at MY's CP3
-- arrived at 841 & went down Xarm direction---maybe CP5 at mx?

* Ski informed that instrument air will be dropping off at EY today
* Kyle informed that he will be overfilling CP8 & turning off instrument air for other work

HAM1 Annulus Ion Pump Alarmed, but Kyle informed that only ones we worry about now are the Gate-Valve ones.

Start H1 MC degrouting (see work permit).  Will prop Southern Exit door for

Doug transitioning EY to Laser Hazard

H2 Alarms (Not sure what I'm supposed to do about these):

--SUS ITMY CPU MAX

--H2 SEI IOP BSC8 CPU MAX

--H2 TCSL0---INVALID & MAJOR alarms

all of these alarms occurred toward the end of the shift

200W beam

Before re-installing the BSC8 Dome, I took lots of photos of the BSC8 ISI.  These photos are from Stage0 up to the top of the Keel--basically anything which could be seen from the upper work area of BSC8 (so no photos of the Optics Table were taken).  Quite a few photos were taken, I tried to take pictures of everything with a flash & without (both have their benefits and issues). 

I archived photos according to ISI "corner" and also made an extra collection for the Keel Masses on top.  Here are the collections in ResourceSpace:

Corner 1

Corner 2

Corner 3

Keel Masses On Top

Each 5-channel 4.5" CFF flange had at least one feed-through channel which did not leak but each flange had multiple feed-through channels that did leak (to varying degree).  The largest individual leak on flange "A" was 1.0 x 10-4 torr*L/sec.  The largest individual leak on flange "B" was 3.1 x 10-5 torr*L/sec.

Due to the HEPI Vertical Actuators being left locked down by an Assembly Tech, the final position numbers for the BSC8 platform I report in aLOG 2150 are not accurate.
I removed the locks this morning and I see a little movement of the system.  The motion is still not large but best to report it.

I now see a 9mil tilt down from SE to NW.  This is a 60µrad tilt and on the BSC optical Table at 77"φ, this would be a 4mil or 0.1mm tilt, if it remained a rigid structure which it isn't when unlocked.  It is however in the same direction of the tilt of the optical table I observed on Jan18.  Result, a 0.2mm tilt has become a 0.3mm tilt.  Does anyone want me to attempt correcting this?

Translation: There is a .005" shift South & a .009" shift West.  As I page back through the aLOG for IAS notes, I'm pretty sure we are nowhere near hitting tolerances for position remaining within .2mm transverse and <1mm longitudinal.

Rotation (Yaw) We translated 10mils South on the East side and just 2mils on the West side for a 60µrad CW rotation.  In aLOG 2069, Doug reports a 10µrad Yaw but I don't know the direction so giving us either a 50 or 70µrad CW Yaw.  Does anyone want me to correct this?

The corrections with HEPI are not easy as the Actuators are attached and they invariably pull or push the system around at these mil scales.

This weekend the chiller for YEND tripped off on a fault. The second unit was switched on Monday morning. VEA temps are shown in the attached.

Apollo shutting down X-end instrument air supply for the day to reroute lines for QDP80 reorientation.  I will restore LLCV/PID control of CP8 before leaving tonight-but expect CP8 alarms tonight

Attached are plots of dust counts > .5 microns.

Measured the weight of ISC table + telescope. Using 320D-36, it was 78.2 kg. At first 320D-36 was totally crazy and we needed to recalibrate it using a smaller scale that is normally in the shipping area and about 60kg of aluminum weight.

After that, we brought a Genie with 5-axes attachement in the EY lab. Cube was successfully moved from the Bosch frame to the Genie, and we rotated it 180 degrees in preparation for the installation.

Now both the tele/table and cube are on Genie, and we're fully ready for transport and installation.

Interior drywall installed today. Remaining drywall pieces and plywood to be installed tomorrow. Patch work/hole drilling the rest of the week.

New 5-channel 4.5" CF ESD feedthrough flanges leak! -> Douglas D., Justin B. and I tested (2) each of these, one of which was to be installed and BSC8 today prior to pumping down the YBM.  Helium responses were large and fast but we did not record the actual peak numbers as we were in a "pass/fail" mindset-these definitely FAIL!  We may repeat test tomorrow and record leak rates for the record.

Travis, Jason and I spent most of the day down at EY struggling with the mechanics of ETMy as the chains are not well set in yaw and are proving a pain in the a$$ to align.  In fact, we had to pull the reaction chain away from the main (via EQ stops) just to work on the main without reaction pushing on main.  After ~5 iterations of Top Stage blade tip alignment, we finally ended the day with the main chain hanging at some 500urad out.  Jason reports that this is roughly where we started this morning...

We also fought a differential pitch between the ERM and the PenRe above it - due to the loop.  We attempted to move the loop along the barrel a bit to see if that would help.  It didn't appear to, so that's when we opted to clamp it off away from the main anyways.

Pictures are in ResourceSpace:

https://ligoimages.mit.edu/?c=961

Original picture names describe what area the picture is capturing.

I've updated H2 SUS ITMY's compensation filters such that they contain all compensation for all stage's electronics. The coil driver compensation filters (found in the COILOUTF banks) are arranged in filter modules according to T1100507. The SatAmp whitening compensation filters (found in the OSEMINF) remain in FM1. 

I've also removed any old, erroneous, and/or unused filters in these banks. Note that the "to_nm" filter in FM5 of the OSEMINF banks is a calibration filter for the OSEM sensors (just a gain of ~40 nm/ct), but is untested and should not yet be used.

Details
----------------

The new filter file, 

/opt/rtcds/lho/h2/chans/H2SUSITMY.txt

has been copied over to the userapps repo,

/opt/rtcds/lho/h2/userapps/release/sus/h2/filterfiles/


Because the updated coil driver compensation scheme involves different filter modules than the previous scheme, I've also updated the burt snapshot files,

/opt/rtcds/lho/h2/userapps/release/sus/h2/burtfiles/h2susitmy_damped.snap
/opt/rtcds/lho/h2/userapps/release/sus/h2/burtfiles/h2susitmy_safe.snap

capturing them from the autoBurt.req file found in 

/opt/rtcds/lho/h2/target/h2susitmy/h2susitmyepics/

Witness plates, which are 4" diam. silicon wafers, were installed in BSC8 and nearby beam tubes.  The first two attached images show the installation as of Feb. 1, and as installed on Feb. 2.  Locations match, but the second images includes the detail, that may or may not effect the results, that a witness plate was broken and replaced in one location.

Location for witness plates were chosen to give information about migration of particulate from beam tubes to the BSC8 chamber.

Additionally, I chose locations to look at specific areas of interest.
1) both sides of the bellows in the Y arm beam tube (West) and the beam tube that is on the North side of the chamber - (bellows effect on particulate migration)
2) gate valves - in North beam tube and East beam tube - (gate valve effect on particulate)
3) directly under the gap between the ACB and ITMY - (to measure what particulate is falling in front of the optic)
4) directly in the center of the chamber - requested by Jodi for ICC - (to measure overall BSC8 particulate)


I've chosen to aLog witness plate info under LHO, VE, and I've included the specific chamber in the title, i.e.

Title -> "specific chamber"
Section -> LHO
Task -> VE

I've also attached two in-chamber photos of witness plates placed on Feb. 1 - North Beam Tube and East Beam Tube.

One image attached here, and the rest found in ResourceSpace.

https://ligoimages.mit.edu/?c=959

The BSC8 HEPI was placed on the fixed stops during the Dome install as the crew can't help but stepping on the Crossbeams.  Once the Dome bolts had been torqued, I suspended HEPI again and read dial indicators for a final delta from last alignment time.

Of note, the before & after dial indicator readings captures the ACB swung back and in place and I saw a 2mil(.002") lower reading to the west while the ACB had a little more leverage on the system--may be within the noise of DI reading and robustness.

Anyway, post final alignment numbers on Jan 19:
Level--There is a 5mil tilt down on the northside.  Our Dial Indicators are essentially at the Support Tubes so I put this tilt in the small category: 0.005"÷60"=80µrads
Position: I see a <6mil shift to the South & <10mil shift West.
Rotation: The dial indicators imply a CW (from above) of no more than 60µrads.  This is worse case as the SE corner shifted South 9mils and the NW corner shift South 1mil.  Averages would reduce the rotation amount.

As this is a close out, I've attached 17 pages of my log book mostly showing dial indicator readings and elevation surveys while we adjust to IAS requests and install and center HEPI Actuators.  I know it is a bit messy but it is a logbook.  If you need clarification just ask.  A couple notes:
DI readings are in .001"(mils).
Corner 1 is NE, 2 is NW, 3 is SW & 4 is SE---This is different from LLO established pier numbering.  I'll try to conform to this in the future.
V T & L corresponds to vertical, Transverse(N-S), & Longitudinal(E-W)

Greg G. Jim W. Scott L. Ed
	HAM 3 now has the housings and crossbeams installed. We used the spacers between the base clamp and the crossbeam this time and it worked really well, much better on the clearances. So well that HAM 2 should probably be retro-fitted with them.

Earlier this month, we had made a complete assessment of all aLIGO SUS signs and flips across suspension types (see T1200015) and currently functional builds of those types (see SignStatus_120111.pdf). 

In doing so we identified:

- Some suspensions had a few of their magnets flipped
- The BSFMs had some mistakes in their Basis Transformation Matrices
- Some suspensions had there OSEMINF sat-amp compensation filters defined with more poles than zeros
 

For the most part, we have now rectified these problems. I attach a new assessment. The remaining action items are

- Fix H2 ITMY M0's F2 and F3 magnet sign; to fix when we swap out for real ITM Optic
- Figure out what's wrong with X2 PR3's SD OSEM; currently under investigation.