12/4/2017 @ ~1330? hrs. local to 12/5/2017 ~1430? hrs. local

This is a known noise source when IFO is in a sensitive state (not currently applicable).

The corner station weather station is reporting bogus high temperatures (146F, 63C). These signals ramped up over the past week, please disregard this station for now.

WP 7239

Today I locked out-tagged out GV4 in closed position (next to biergarten in LVEA) in preparation for testing fitting shroud assembly which requires removing power cables from motor & encoder  and thus temporarily killing power to valve. Ken can help with electrical. Mark can help with rigging and assembly. Need to operate west crane.

(Peter K, Gerardo M)

All dog clamps holding the OFI spacer were re-torqued, due to finding one dog clamp loose.
AOSEMs were set on brackets and positioned to be close to center (per MEDM screen), all fastening components were tighten, set screws and adjustment collar screw, to hold them in place.
Next step is to run a transfer function to determine damping.

I took some quick dtt tfs on ITMX today, because some of the long matlab tf infrastructure isn't working right now. I only took ST1 X,Y,Z,RX, &RY (I don't know what RZ would tell me better than the other dofs) tfs and looked at ST1-ST1 and ST1-ST2 tfs, I think this gives me enough data to compare to past tfs. First 2 plots are the ST1act to ST1l4 & ST1act to ST2gs13. Second two plots are the cartesian undamped tfs (for the same actuators and sensors) that we used to design the controllers on ITMX. I think they are in the same units, they look similar enough I think we can say ITMX ISI is free.

After finishing the ITMX tfs up, I went out and locked ITMX and HAM4. 

   Check all dust monitor vacuum pumps and adjusted vacuum pressure where necessary. All temp checks are good. 

   The corner station pump is showing a bit of carbon on the muffler. Will continue to monitor soot on muffler and watch for pressure changes, that indicate the vanes are getting close to end of life. I have a rebuild kit on site for this pump. 

RickS, EvanG, DarkhanT

At around 11:30 local time, we shut down the Pcal lasers at both end stations.

Shutter controls were set to local and the shutters closed.

Laser power supplies were switched off and the keys removed.  Keys are in the Pcal tool zip-lock bags on the shelf in the Pcal pylon at each end station.

Laser power supply and AOM driver modules were switched off (two rocker switches on the back side of module).

J. Kissel, B. Weaver

In prep for final in-air characterization of the OFI after alignment to the IFO and restoration of the eddy current damping magnets (a.k.a. "blunting" magnets), I've reverted the OM1 infrastructure -- the electronics readout, four-OSEM cable system temporarily covering all of the OMs, ZMs and the OFI -- to the previously commissioned OFI configuration. I reverted to the original values measured for the open light current ("voltage", OLV) in LHO aLOG 38994. The OSEM2EUL and EUL2OSEM matrices were re-installed using Matlab scripts described in LHO aLOG 39033.

Note, for future reference, the ZM2 open light current values were taken from LHO aLOG 39573.

Last Fri (12/1), I went into BSC1/2/3 to take a few photos.  Betsy requested a few line of sight photos of (ITMx to PR2) & (ITMx to SR3)--these shots are to highlight/show the baffling involved in these paths (so we have baffles around the BS and also on the BS Suspension structures).  

I took 150+ photos, but unfortunately I don't have a place to upload them (resourcespace has had issues for me for the last year or two).  Photos will be on my computer.  Am also attaching some highlights (their names roughly say what is in the photo---it's hard to tell what's in the pictures, but I am hoping I've labeled them correctly).

This morning, Brijesh, Siddhesh, and Uma (sp?) joined Travis and I to apply First Contact to the BS HR and AR surfaces.  We painted these layers on (not the previously spec'ed spray application) as per suggestion by SYS/COC.  We will pull these layers closer to the chamber closeout.

   EVERYONE IN OR AROUND CLEANROOMS! Please avoid where possible the gooey residue from the white tape used on the curtains in the past. This residue is the glue reacting with the vinyl and liquefying. It is sticky and cannot be removed without using solvents, which damage the curtains. 

   Please try to avoid there areas, as best you can until these curtains can be removed/replaced. If you get any of the goo on a C3 garment, please change the garment immediately. Set it aside and notify me. I will pick it up and and try to get it clean enough to go back into service. 

   Please contact me with any contamination control problems, questions, or concerns. 

Thanks from contamination control for keepin it clean.       

The output power of various visible alignment lasers currently in the LVEA was measured.
All are 635 nm (red) diode lasers.


  

    
 Laser 
    
 Output Power [mW] 
    
 Class 
    
 Comments 
  
  

    
 spare OpLev laser 
    
 0.070 
    
 1 
    
 Mounted on a tripod, by the wall north of HAM5 
  
  

    
 baffle alignment laser 
    
 2.75 
    
 3R 
    
 Alignment laser used in the biergarten, based on momentary use 
  
  

    
 TCSX alignment laser 
    
 0.43 
    
 2 
    
 Housed in the TCSX enclosure, generates a cross 
  
  

    
 TCSY alignment laser 
    
 0.28 
    
 1 
    
 Housed in the TCSY enclosure, generates a cross, measured ~100 mm from output aperture,
classification for this particular laser only 
  


All powers were measured with a Thorlabs S140C-SP1 power meter, S/N 12092856 using a PM100A display
S/N P1001329.

This morning I completed the weekly PSL FAMIS tasks.

HPO Pump Diode Current Adjust (FAMIS 8451)

With the ISS OFF, I adjusted the HPO pump diode operating currents.  The changes are summarized in the below table; a screenshot of the PSL Beckhoff main screen is attached for future reference.

I did not adjust the operating temperatures of the diode boxes.  The HPO is now outputting 155.4 W and the ISS is back ON.  This completes FAMIS 8451.

PSL Power Watchdog Reset (FAMIS 4022)

I reset both PSL power watchdogs at 18:35 UTC (10:35 PST).  This completes FAMIS 4022.

Only item to report is the BS SUS which is RED on CDS, but this is a known issue.  It is locked down, but it was damped before yesterday and tripped yesterday (TJ later informed me this is related to new Guardian state for allowing SUS to ride through earthquakes better...it's being worked on by TJ & Sheila).

Dust Monitors fine this morning.

Maintenance has already started with (1) Ken has started work in LVEA for installing electrical outlets for CP1/2, and (2) Christina has started LVEA cleaning.

Cheryl, Ed

Ed - IM3 - After re-centering the mounting plates for the leaf springs to better center the wires in their spaces, I was able to recover a good portion of the YAW alignment as it was after I zeroed the sliders. Pitch requires the removal of the baffle which was not done at this time. Images below show values before any work was done and then what I finished the day with. More aggressive physical positioning may be required to recover best alignment.

Rakesh and I cleaned the ~ 30-50 contamination spots on XBM interior wall, a few feet away from cryo baffle, ranging in size from 1 mm diam. to 1" diam. We scraped the surface of these spots with small flat head screw drivers and a tool with a pointed edge, and collected the brown/black flakes, to be analyzed via FTIR. We wiped with IPA wipes and also tried acetone and methanol (wiped away same as IPA). The spots leave a stain on the SS wall. We are not able to remove 100% of this material with our cleaning technique. The beam tube wall is rough, so wiping is limited without creating other issues with wipe shedding. The location of these spots is two tube welds in from cryo baffle.

Travis and I walked down X-beam manifold in chamber to investigate unknown contamination on the interior wall that Betsy had spotted, a few feet away from oplev flange/baffle. We found two dark brown/black spots near the top/roof of tube, each about the size of a quarter. I was able to scrape some off with a little flat head screw driver and then wipe with IPA wipes to improve/reduce the spots (grinding is needed to remove all). Before and after pictures attached. I wiped until there was no evidence of contaminate on wipe. Then we noticed the side wall was splattered with the same material (photo attached). Its first layer comes off by scraping with a tool, but we did not spend time scraping all 50-some spots. We can go back in to scrape these other spots, but I would first like to send sample in for analysis.

Note that we have seen evidence of higher pressures in XBM (compared to YBM) when it's isolated from beam tube. Could be outgassing from this material. Travis and I inspected YBM and did not find this contaminate.