Thomas informed me that the PSL ISS was having issues.  Upon investigation I found the HPO was only outputting ~117W.  To keep the laser running for the remainder of the day, I tweaked the pump diode operating temperatures for DB1 and increased the operating current of DB2, 3, and 4 from 59.0A to 59.7A.  The output power of the HPO increased to 131.0W; this also cleaned up the ISS, which was oscillating because of the low power out of the HPO.

During the upgrade process, some local working directories on the CDS file system will still be using the old 1.6 svn version, and others will be using the upgraded 1.8 version.  Remember that the two versions are completely incompatible (in both directions).

The CDS workstations now have version 1.8 svn code installed in the default svn location (/usr/bin/svn). To permit running the 1.6 code if and when needed, please create an alias in your .bashrc file

alias svn1.6="/ligo/apps/debian8/subversion-1.6-17/bin/svn"

This is only a temporary work around, eventually all working directories will be migrated to 1.8.

IMPORTANT NOTE: when viewing a 1.6 working directory with a 1.8 svn program, the system may suggest you upgrade the directory using the 'svn upgrade' command.

Please do not do this!

In the upgrade process I am resolving local modification, adding files which should be under config control, and making sure files which are cluttering up the old working directories do not migrate to the new directories.

Elizabeth C., Marc P.

Taking advantage of a one hour window in operation we repaired the Corner 4 and Corner 6 squeezer readbacks per WP7309. 

In Corner 4 we replaced module 19 on the left rail with a new EL3104 (4 channel differential ADC)

In Corner 6 we replaced module 5 on the right rail with a new EL1124 (4 channel digital input)

Both of the replaced modules appear to be working.

WP7227

Daniel, Sheila, Dave:

New models for h1asc, h1ascimc, h1lsc and h1omc were installed. DAQ was restarted.

Sheila, Nutsinee, (with Lisa and Fabrice on the phone)

Yesterday afternoon we made prepared to swap the M1 mirror for the higher 532 reflectivity version.  I pulled the low finesse mirror out of the cavity, but then noticed that the high finesse mirror isn't usable because of glue on the back of the optic.  We put the original mirror back in using the tooling that Fabrice sent.  There are spots for two alignment pins to be used in installing the mirrors, Fabrice had only used one of the pins (the front one) in constructing the cavity.  I found it easier to place the mirror such that I could see cavity flashes without the pin in place.  The pin is now in the bag with the tooling in case we want to use it for a future swap.  

I placed the mirror without moving the green beam which had originally been alinged to the cavity, to get cavity flashes, but then adjusted the input alingment for both red and green to get a good alignment into the cavity. 

Fabrice and Lisa are making another attempt at gluing today at MIT, so we might have one more chance to swap the optic. 

Came into the Control Room this morning to find that the laser had tripped off from the power watchdog.  Looking at
the trend data suggested that it tripped around 2:30 am.  Had some minor problems bringing the laser back on, whereby
the Beckhoff computer was not responding.  Opted to reboot the computer.  It came back without any problems.  The
laser restarted okay afterwards, with the output power considerably down from yesterday (as indicated on the main
user screen).  I opted to increase the diode currents.

    The  power watchdogs are currently OFF.

CO2X faulted out due to a chiller issue. I suspect the pzt servo control loop, as the integrator seems to do a weird count up issue and eventually try to set the chiller set point too high and cause the chiller to exceed its limit and shutdown. Both CO2X and Y are doing this. For now that control loop is shutoff.

Also, the CO2X power monitor isn't working correctly and is showing a 20.9 A with a ~0 V reading on the laser, but a quick check on the power supply shows 28V and ~0.7A reading which is consistent with the laser on standby. 

Nutsinee, Sheila, Daniel

The 4 D9 cables (H1:ISC_SQ_394, H1:ISC_SQ_395, H1:ISC_SQ_396, H1:ISC_SQ_397) from the patch panel to the picomotor four axis breakout boxes had to be replaced for low profile versions as the ends of the custom D9 cables were too fat to fit to the patch panel (see attachment).

Note some of the connections from the breakout boxes to the picomotors are currently inconsistent with with the schematic D1700384. The working arrangement is listed below.

H1:ISC_SQ_394   PSL fibre pol 1/2 1X, PSL fibre pol 1/4 1Y, PSL power 1/2 2X  (ok)

H1:ISC_SQ_395   CLF 1/2 2X,  CLF 1/4  2Y, Green fibre pol 1/2 1X, Green fibre pol 1/4 1Y (different to schematic)

H1:ISC_SQ_396   CLF power 1Y, Green Power 1/2 1X (different to schematic)

Also the software for the Step rotator on SQZT6 is currently inoperative.

second camera: I aligned the camera on the upper right viewport on HAM2 West door to the calcite wedge on the input of the IO Faraday.

first camera: I maintained a view of baffle HA1 (downstream of IM1) on the camera on the upper left viewport on HAM2 West door, but shifted the view of the camera upward in real space, to capture the double aperture on the beam path to the ISS Array.

During a routine check of the Y-end purge-air supply today, I found that the drying tower had a "switching error" with the Left tower regenerating and the Right tower drying.  I reset this and confirmed that both towers were switching normally.  Hmmm..  Chandra also had this happen in the past but the issue seems to be intermittent - with long periods of no errors detected.  For now I will try and check this on a daily basis as opposed to every few days.  

Also, the current demand for purge-air from the VE is resulting in an output pressure of 0.8 psig.  Even so, the skid is alternating between 3 - 4 compressors.  I'll try and revisit if the programmed pressure set points at which the PLC adds addition compressors is easily changed.  If so, I would like to see fewer compressors running for this, relatively modest, demand.  

Keita, Corey, TVo

We finished aligning the OMC Trans path, it was quite difficult to lock the OMC, even with purge air turned down, but Keita was able to lock long enough for me to trace the beam to the viewport emulator.  Keita will post a picture of the beam position in the emulator.

Yesterday we quoted a beam clearance for the fast shutter wire with the shutter closed, we've repeated the measurement with the shutter open and found that the clearance is grater than 12-13 mm, Keita wil post a picture of this as well.

We also took a ton of pictures of the table for future references, Corey will post pictures as a comment.

At the end of the day, we turned up the purge air and took the viewport emulator back down and placed it southwest of the PSL enclosure where Jason and I found it yesterday. 

Sheila, TVo

I had trouble locking the IMC yesterday when increasing the input power.  So we measured the OL TF at the Common Mode board and found that the UGF was about 100 kHz with maybe 20 degrees phase margin while locked at 1 W.  So we changed the guardian common mode gain calc by -4db to get a little more phase margin and match what Kiwmau's suggestion was in aLOG-36354 of about 50 kHz nominal, it now stably working at 10W.  I've attached the plots of different power levels input into the IMC.