The IO work on the Faraday Isolator on the PSL/IO table is finished, so today I started the transition to low-power mode.

The high-power oscillator was shut down (to conserve pump diode lifetime).

The PMC modematching lenses have not been moved yet and the alignment into the PMC has not been adjusted.

For now, the front-end internal and external (manual, mechanical) shutters have been closed for installation of the beam tube between the Laser Area Enclosure and the HAM1 chamber.

Tomorrow, we plan to complete the transition to low-power mode.

I've enabled the damping on MC3 at 4:45pm, so we should be able to get spectra for past this time.

While the Main chain damps, we can't engage the reaction chain damping.  We've carefully poured over settings to see if there is a sign, filter, or gain setting incorrect but all looks well.  Example Symptom: When engaging Transverse (only uses SIDE BOSEM), we see no ring up or down.  When flipping the sign on the damping we see a large ring up.  This indicates the SIDE magnet polarity is correct.  More forensics tomorrow morning, but I'm hoping to solicit Richard to help me see actuation out on the floor...

I've also re-checked that there is no rubbing on this chain, and that it appears to be floating freely when pushed.

Disconnected SUS SEI field cabling from HAM3 feedthrus to dress cabling inside cable trays around HAM3. All electronics were powered off before cables were disconnected. When reconnecting cables, had Corner 1 and 2 for ISI driver (Coarse and Fine) connected backwards. Hugo is trying to bring HAM3 ISI back up.

[Giacomo, Paul]

We installed the parking beam viewport baffle in HAM 2 this afternoon. The installation went smoothly; it was easy to access the viewport standoffs by sitting on the table with our feet on the HAM1 side nozzle. Just in case, we had put a C3 sheet over most of the the table to protect against dropped screws. I attached some images of the installation process. 

We did however notice a slight issue with the standoff posts. The posts have to be screwed into the viewport reducer by hand, and since they are cylindrical it is not easy to torque them very much. The silver coated screws that screw the baffle assembly to the standoffs are quite tight within the standoff thread though. Since the baffle assembly should be adjusted in rotation to pass the beam through the aperture, one may be required to unscrew these screws. Unless a pair of pliers or similar is used to hold the standoff in place, attempting to unscrew the screw that fixes the baffle assembly to the standoffs will instead unscrew the standoffs from the viewport reducer. This should be kept in mind for anyone adjusting the baffle rotation, and potentially for LLO / India installation too. It was suggested to look into a small redesign of the standoffs to fix this issue.

(Jim, Chris, Giacomo, Douglas, Gerardo)

We installed the REFL parking beam viewport, first the aLIGO IO reducer was installed, part number D1201195 on port D8 of HAM02, on top of the reducer a viewport was installed, assembly D1101670, the following just for posterity, we used 5/16-24 x 1.5", 12 point, silver plated bolts to hold the assembly to the reducer.

The viewport is now covered with a viewport protector and a safety cover (yellow type).

Leak check needs to be performed on this viewport.

It seems that the ISI foton files have been moved to the userapps directory, and the old location is now a softlink to the new location. e.g.
/opt/rtcds/lho/h1/chans/H1ISIITMY.txt is a softlink to 
/opt/rtcds/userapps/release/isi/h1/filterfiles/H1ISIITMY.txt

(see https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=4093 for more info about this change, real documentation will be forthcoming.)

To support this file move, I have updated the SEI tool get_filenames.m so that it will follow a softlink for the foton file location. It will not work on a windows machine, and will only follow the link one step, but it should work, once the {SeismicSVN}/Seismic/Common/MatlabTools/ directory is svn up ed.

See the SEI log for some more info: https://alog.ligo-la.caltech.edu/SEI/index.php?callRep=126

SEI diagrams are built such that SUS watchdogs trip SEI watchdogs. During testing, the QUAD can be installed on one teststand while the ISI is installed on a second teststand. The connection between SUS and ISI is not necessary in this case. For convenience (no need to modify/recompile the model after every change), I added in the diagram of h1isitst.mdl a switch that disables the ISI-SUS watchdogs connection.
By default (variable at 0, case after recompiling a model without any burt restore), the ISI will read the SUS watchdog. If the variable H2:ISI-TST_SUS_WATCHDOG_DISABLE is set to one, the state of the SUS watchdog is ignored.

I'm updating the M2 and M3 stage AOSEM offsets/gains for MC3 now that they are on the IFO electronics.

As noted in earlier logs, there was a small V-P coupling seen in MC3 TFs posted by Mark here.  This morning, I made an adjustment to the top T1 BOSEM as the flag was much closer to the LED than the PD (or vice versa since they look the same, but at least this is descriptive of the axis of the misalignment).  Mark is remeasuring the undamped TFs but the small V peak in R looks even smaller.

Picking up where we left off before rotating the CP last week, I resumed ITMy alignment/damping work.  Since the user model was transitioned by Dave during yesterdays switching of machines from H2 to H1, and the safe.snap was out of date, I had to manually restore the values/signs determined by Kissel/Sadecki Oct 30 in alog 4549.  I've confirmed that the main chain damping appears to work (no noticeable wobble of the speed dials) and Dave updated (and committed to svn) a new h1quadtst_safe.snap located at

0$ /opt/rtcds/userapps/release/sus/h1/burtfiles/quadtst/h1quadtst_safe.snap
 

The reaction chains spins out of control when the damping is enabled, so clearly we still have a sign wrong somewhere there...

Mark B.

Starting to take MC3 TFs again at 11:20 following tweak by Betsy to hopefully correct very minor vertical->roll coupling seen yesterday.

- Cheryl, Luke, Rodica

Faraday now has it's baffles.  Beam used for alignment was centered through the magnet.  One AR reflection was hitting the back of a baffle, so I moved it to allow the beam to pass through, after talking to Rodica about where that beam is supposed to be dumped.  This means that the beam going into the FI is about 1/2 a beam diameter off center going through that baffle.  Pictures attached.

Image 1: incident beam as it goes through the baffle in front of the HWP.
Image 2: the baffle between the DKDP and second calcite wedge, and the baffle that's attached to the calcite wedge mount.  Shows the beam as it exits the FI.

I have updated the dust monitor code as per workpermit 3531. This is an update of the code that was being tested here. It is checked into the projects subversion repository under revision 2130. The primary purpose was to fix some communication errors. It is now the version that is running.

Dave, Jim and Vincent

We spent today removing the last of the H2 front ends from the LVEA and moving them over to H1.

The H2 front ends h2susb478, h2susb78, h2susauxb478, h2seib8 were powered down (h2tcsl0 having been already removed from H2). Jim rerouted the fibre connection to the FE and DAQ switches in the LVEA to the H1 switches in the MSR via the H2 EE building patch panel. These switches were then reconfigured to serve H1 VLANS. DHCP and DNS changes to boot the three frontends to support the Test Stands.

The IOP models were transitioned from H2 to H1, and the front ends were booted in the new H1 guises.

The ITMY system is now called QUADTST, the FMY system is now called BSTST.

The user models were transitioned, both for IFO (H2 to H1) and for OPTIC (ITMY,FMY to QUADTST,BSTST). Most Dolphin IPC were removed from the models, with the exception of the SUS WD status to the ISI, and the IOP Watchdog system.

The safe.snap files for these models were changed to H1 (Vincent did ISI). All the filterfiles were changed to H1 (Vincent did ISI).

MEDM screens were changed, links from sitemaps were changed.

Old system were removed from H2DAQ and added to H1DAQ. H1DAQ frame size increased from 182MB to 203GB.

simulink webview was changed to only show H1 models.

the old h2susauxb478 will not be powered back up and will not be part of the H1 system.

The ITMY optical lever which was temporarily connected to h2susb478 needs to be cabled to the H1 EE room.

The welder has completed the welding required in the HAM3 cleanroom.  There is still welding to do just north at the south end of BSC2 but that is outside the cleanroom.  Heading south the plumbing goes a few feet south of the HAM3 cleanroom.  A couple more lengths of main line and then we'll be wanting to get into the HAM2/1 area.

Since H2 has gone away in CDS, I shutdown the H2 conlog EPICS client at ~ 4:15 PM. The medm was reporting ~ -97 monitored channels and a few thousand unmonitored channels, which is a bug that needs to be investigated. The web server for recorded data should still be available.

The Romer Arm was moved at HAM2.

Dave started decommissioning of H2 CDS (think he's almost done).

Hugo ran quiet measurements for HAM3 ISI

FMCS alarmed at MX a few times (Ski mentioned this would happen)

Dust Alarms near BSC4 & HAM2 throughout the day.  They were quick peaks and not too high.

Eric A. installed electronics brackets for HEPI at HAM3.

Contractors:  Praxair, Unifirst, Ace Key & Lock