Today's random list of notable events:

 Cleaning at EY/EX in preparation for vent (Terry/Christina).
 Vacuum system pumps running at EY in preparation for vent (Kyle).
 Restoration of (some) vault channels, others to be investigated later (Richard).
 General Tuesday maintenance contractors/vendors on site.
 One pallet delivery to LSB (Gerardo), and one pickup (Richard).
 h1adcuex CPU has failed and will require replacement (Richard).
 Other scheduled tasks not listed here.

Changed the check valves on the control air compressors at X mid.  Restored system

Mike and I went to HAM6 to lock ISI/OMC down.

For OMC breadboard, all 14 EQ stops were engaged, though probably that was an overkill.

We decided to leave ISI locked down (no eddy current damping).

Today:
Mike and Keita locked down HAM6.
Richard attempted unsuccessfully to fix the vault PEM channels via MX restarts.
A number of FMCS channels have dropped out (INVALID), suspected DAQ issue. May be related to PEM issues. Dave has been notified via e-mail but won't be in until Wednesday.
Gerardo took some measurements of the 'experiment room' at MY.

Shift ends as the door is being put back on HAM6.

We encountered an issue with mounting/tuning the BOSEMs located on the Quad Top Mass. To raise the flag assembly high enough to fully interact with the light path, we placed two 1/4-20 flat washers under the Magnet Retainer (D060418). (Note: Cannot add more than 2 washers as spacers due to the short threaded shaft on the Magnet Retainer.) With the washers in place, there is just enough height to get full light block when the adjuster is run all the way down. On the Quad-2  Reaction Chain right side, we are just able to get half-light with the BOSEM fully down.

In the attached photo, the flex circuit is just about to contact the base of the OSEM mount, and there is around 6mm of travel left on the adjuster. If the OSEM is cranked down enough to get full light block, the flex circuit is folded and possibility kinked against the mounting block. Given the circuit path is at the edge of the film, and the flex circuit could be pinched between the OSEM and the mounting bracket, cutting the film and shorting the OSEM is a possibility.

Mark Barton is looking into a long-term solution. 

Dewpoint measurements normal @ Y-mid and Vertex, i.e. <-54C.

Y-mid purge air dewpoint measured -13C drying tower working normally purge air flow full-open since incursion yesterday 4 or 5 compressors running constantly to meet demand soft-cover on for the weekend -> dialed flow down -> dewpoint measured -27C an hour after dialing flow down

Removed VME cards and chassis from H2 racks, expect for network and fiber box. Holding off in removing VME crates from racks due to storage issue. Will do inventory of items removed for storage and will upload on Alog early next week. As of now we have removed around 1,000 lbs of cabling.

* BSC6 (MY) Payload completely removed from Optics Table and all tooling is out. (see earlier entry)
* Working to get the Vault seismometer and magnetometer moved from h2adcupem (in LVEA) out to MX. (Richard & Dave)
* HAM6 Cleanroom was retrofitted for in-chamber work next week.  (Jodi, Ski, Apollo Duo)

Following the reintroduction of the fast chans back into the DAQ, I put
all the slow chans back into the EDCU. This is not exactly the same, since
the EDCU will try to connect to all chans defined, whether they are in the DAQ
or not. In order the "green" the DAQ overview on the main medm screen, I have
redefined "green" to mean 10022 channels connnected. This value will change as
IOC and decommissioned.

(Betsy, Corey, Mitchell, Travis)
Today we finished off the removal of objects from the BSC6 Optics Table.  Yesterday we removed the ETMy Optic Assembly, and some of the Transmission Monitor Telescope.  Today, we removed the rest of the Telescope, weights (hockey pucks), and all the tooling needed to remove the ETMy.

Additionally, the ribbon cable for the ETMy OSEMs was unbolted from the table and stuffed up and inside the Optics Table (to ease in the removal of the iLIGO BSC SEI system); want to note that this cable is still connected to the electrical feedthrough and should be disconnected as well.

The door is still removed (for later de-install work), and Filiberto left a power supply out there for the BSC6 illuminator. 

(Corey, Doug, Jodi, Kyle, Mitchell, Travis)

Once BSC6 was vented and the door was removed (around 2:30-ish?), the crew started with removal of ETMy.  This involved:
o Much staging
o Taking contamination sample of chamber
o Setting ETMy on earthquake stops (with teflon on tips of stops)
o Installing LOS Installation fixturing
o Removing ETMy
o Removing part of the ETMy telescope

Tomorrow, we will remove the rest of the Telescope and the hockey puck weights.

Kyle-vented Y-mid 

Kyle, Travis-Removed BSC6 south door.

Today's Activities:

Mid-Y activities - Kyle, Jodie, and others - venting of BSC 6 at Mid-Y.

Michael R. making PSL measurements in LVEA
~14:45 local – contractor on-site for PSL flooring quote

Corey and Betsy using crane near HAM1 and H1 PSL

Filiberto, Richard, and contractors dismantling H2 racks

Ski, Mike L. in LVEA  - taking apart the old H2 PSL table enclosure

Removal of the test mass begins at Mid-Y BSC 6 (Doug Cook, others)

----

By 16:15 local, work continues at the Mid-Y BSC 6 for the removal of the test mass.

As was pointed out, removing the ini files from the DAQ means that
most H1 channels were removed and S6 data could not be trended.
So I put back in the H1 ini files, but set their acquire flag
to zero. All H1 chans should be viewable by dtt and dataviewer,
and the archived frames should be accessible.

Ski, Kyle, Hugh - Craned forklift over XBM.  

Kyle, Ski, Travis, Andres, Betsy, Cheryl, Patrick, Hugh - Removed HAM2 East Door then rehung following Cheryl's in-chamber work.  Removed HAM3 East Door and rehung following Cheryl's in-chamber work.  

Kyle - Started Y-mid purge air compressors.  

The LHO X1 SEI test stand had some unusual parameters this morning. I was not able to isolate the table with older Robust Control filters, even with just putting a 0.1 gain on the controller.  I noticed the un-filtered geophone channels nearly saturating.  To be safe, I rebooted the frontend code, but the problem remained. 

I then checked the damping loops - they were engaged.  However, the gains on the outputs were set to 1.  I thought this was the nominal value until I tried to un-damp, then re-damp the table - no success.  The actuators saturated immediately, tripping the watchdog.  So, I then tried a negative gain and ramping from -0.1 to -1 - success.  I had forgotten the gains on the Damping loop outputs were negative -1, while all other loops have positive gains.

After this, control loops were still unstable, tripping the Displacement sensors.  I noticed the Blend filters were off, and then after enabling, the robust control filters isolated the table.

I am not aware as to how (or why) the values were changed in the medm, but the Damping outputs have been at +1 since Oct 21. The watchdog was on the brink of tripping with the +1 gain.  They seem stable now with the negative gain - geophone channels are at safe levels and isolation is on.

Did not succeed. For some reason my compiles are deleting the object files and then complaining that they're gone. I don't know what is going on, so I copied the old code back for now. I restarted everything except the motor controllers, since we are not using them for awhile.