AWC Viewport Assembly Installation on HAM5

(Chris S, Kyle R, Gerardo M)

The viewport ASSY-D1700340-001 was installed on A2F4 of HAM5 on December 22 of last year, the conflat joint at this door still needs to be leak checked.

A viewport protector D1200873 was installed with a shiny red metal guillotine D1400106.  To finalize the assembly a yellow protector was used.

 

camera on HAM2 West door upper left viewport installed

I've installed a Watec camera/lens combo on the HAM2 West door, which looks at the baffle downstream of IM1, IO straight baffle HA1.  In order to get a view of the baffle, I used one of our camera housings that sits at an angle to the viewport, and is smaller in diameter than the viewport.  The new position of IM1 (it moved in the +X and -Y directions) and the new Viton under the SiC baffle on IM1 combine to reduce the view of the aperture on HA1.  The edge of the aperture that's closest to IM1 is so close the the IM1 SiC baffle that it's not clear to me that all of the front edge of the baffle aperture is in the camera view, however the baffle is thick, and I can identify the back edge of the baffle aperture on that side.  The mounting system inside the camera housing cannot move toward the viewport even if all screws were to loosen, and the camera/lens combo is on a swivel ball head and is mounted so that in every possible position the lens cannot reach the viewport.  The camera view is rotated 90 degrees.  The first attached image is rotated to correct that, and the second image is true to what is seen on the CRT display, with +Z direction being toward the right in the image, and the third image is a full res image of the aperture (large file, also corrected for +Z = up).

CO2X plumbing

Hooked CO₂ table back up to the chiller lines. Had to use new tubing as the old ones wouldn't reach the pipe anymore. Took the opportunity to look at contamination in the laser cooling lines, Pictures attached. The wipes were inserted into the elbows and run around, you can see what looks like corrosion deposits that rubbed off, as well as some plastic or metal chips. I then blew some air through the chiller lines of the laser, which moved through apparently unencumbered so that was a good sign. I'm not sure why that larger contamination wouldn't be caught by the sock filters on the chillers, it may be there isn't enough flow velocity to move them out of the nooks and crannies. If there was this much in the larger lines I can definitely see why the smaller lines like the AOM were having problems with contamination then.

Miscellaneous vacuum recovery

Valved-in HAM1 500 L/s ion pump and pumped in parallel with Turbo for a few hours -> Isolated turbo and eventually shut down turbo after IP demonstrated ability to survive unassisted.  

Energized IP1, IP2 and IP3 while assisted by pump carts -> Isolated and then shut down pump carts after IP's demonstrated ability to survive unassisted.  

Valved-in GV5 AIP pump cart -> annulus volume at high pressure due to YBM vent and known inner O-ring leak -> Energized GV5 AIP controller and will pump volume with IP and pump cart overnight.  

Still need to climb on IMC and OMC tomorrow to disconnect connected pump cart hardware.

hot cathode gauge behavior

Noticed that the two relatively new full-range, hot cathode ion gauges on corner volume exhibit strange behavior at a pressure between 5e-6 and 6e-6 Torr. Last Friday PT-180 suddenly fell in pressure (no one on site making changes to vacuum systems). Today when cycling turbo valves (for leak checking), PT-170 suddenly dropped in pressure. Kyle noted something peculiar with PT-525 at EX on Aug. 31, 2017 after TMDS discharge activity (https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=38471). Will contact Inficon for an explanation.

Leak checked vertex

Helium leak checked the joints listed below via the new Inficon UL1000, backing vertex turbo, while X/Y-BM turbos were valved out. The background started at 6e-9 mbar-L/s and drifted to 1.4e-8 mbar-L/s after valving out other two turbos, likely from cross talk due to relatively high volume pressure. No leaks found above this background.

• three NEG reducer flanges on OMC
• IP4 GV on OMC
• TMDS flanges and GVs on BSC 1,3 doors
• (existing) TCS viewport flanges on BSC 1,3 doors
• (existing) HAM2-E bottom-middle viewport flange
• ESD flangles & feedthroughs on BSC 1,3 chambers
• PT-120 valve & flanges on BSC 2
• YBM turbo isolation GV
• two blanks that replaced i-LIGO RGA port on BSC 7,8
• viewport flange on HAM5-N door

Restarted h1hwsmsr and h1fwsmsr1

Today we restarted h1hwsmsr and h1fwsmsr1 for Thomas Vo in an effort to get them to detect their cameras.

WHAMs 1 2 3 5 & BSC 2 HEPIs Unlocked

WHAM4 was already unlocked so all HAMs are unlocked except HAM6.  Will unlock BSC1 & BSC3 likely tomorrow.  We've relieved the DC position with the big springs so isolated/un-isolated & locked position (during vent) are the same, to a point.   Will tabulate the diffs and report.

Ops Day Shift Summary

Triple Top Coil Driver Repaired & Replaced - SUS-C4 Rack

R. McCarthy, M. Pirello

We replaced the spare (S1001082) Triple Top Coil Driver with the repaired original (S1100195).  The original had a bad relay and was swapped back in December with the spare.  The unit was repaired, tested, and replaced into its original configuration. 

Alog of events leading up to this: 39877

This is PR3's top mass (T3 LF RT SD) coil driver. It actually resolves the issue of PR3 (LHO aLOG 39540, LHO aLOG 39878, FRS Ticket 9497) -- not PR2 (the aLOG linked above).

Beckhoff slow controls IOCs at end stations restarted, fixed EDCU and autoburt problems

Daniel, Dave:

Daniel restarted the EPICS IOCs for h1ecat[x1,y1]. This fixed the DAQ EDCU and the hourly autoburt connection issues.

new models for lsc, omc and sqz

Daniel, Dave:

new models for h1lsc, h1omc and h1sqz were installed. No DAQ restart was needed.

2018_01_02 13:31 h1lsc
2018_01_02 13:31 h1omc
2018_01_02 13:31 h1sqz

HAM2 viewport covers

Pictures of HAM2 West and East doors showing all viewports have Lexan covers.

Weekly PSL Status (FAMIS #7471)

   No PSL stats this week as PSL is still down for the holiday break.  

Squeezer Faraday TFP extinction ratios

The afternoon of December 22nd I went back into the optics lab and made a few measurements to try to understand why our Faraday isolation was only 20dB(see alog 39861).  It turned out that one of the TFPs had an extinction ratio that didn't meet the spec, and by switching the positions of the TFPs I was able to measure an isolation of -28dB. 

Thin Film Polarizer extinction ratio:

To measure the extinction ratio of each of the TFPs I used a set up very similar to the image in 39861, with the rotator removed (PD monitoring input power in position A, PD monitoring TFP transmission in position C which is after the Faraday path, used chopper to measure transfer function between PDs).  

After the fiber collimator, there was already in place a PBS mounted to clean up the input polarization by reflecting horizontally polarized light.  I also used whichever TFP I wasn't measuring to further clean up the polarization.  I rotated the half wave plate to measure the maximum and minimum power transmitted by the second TFP to get its extinction ratio.  For the TFP mounted with the backplate labeled SN9, I got a ratio of 2220:1 (coated side facing down in the mount, so that incident beam hit uncoated side first), for the one mounted on the backplate SN08, I got 336:1 with the coated side down and 577:1 with the coated side up (so that the incident beam first hits the coated side).  The spec for these TFPs is greater than 1000:1 (spec here)

Better Faraday Performance

In the original set up, SN08 was the first polarizer in the Faraday (the one closer to the OPO), and both TFPs were mounted coated side down.  Scattered light from the interferometer will be mostly in the polarization to be rejected by the TFP closer to the OPO, so swapped the two positions.  Now SN09 (2220:1) is mounted coated side down closer to the OPO, and SN08 is mounted coated side down further from the OPO.  

With this arrangement I repeated the measurements of isolation, transmission, and backscatter (I also increased the laser power compared to 39861).  For transmission measurements I got 95.6% and 97.6%, for isolation I got -27.9 dB and -27.8dB (0.16%), and for backscatter I got -40dB and -41dB.  

Monthly PSL Chiller Filter Check (FAMIS #8304)

   Monthly chiller filter check shows all OK. The filers are clean and clear. 

   I added 200ml water to Crystal chiller, and 100ml to Diode chiller. Diode chiller was not low on water just added what was left over in the measuring cup from the Crystal chiller top off. Closing FAMIS #8304.  

fixed h1nds1 access to frame files

After configuring h1nds1 to once again use framed data from h1ldasgw1 before the break, I forgot to fix the /frames symbolic link. I have corrected this and framed data (full and second trends) should be available. h1nds0 was unaffected.

1505 hrs. local -> Kyle on site checking misc. vacuum pumps etc..

I'll go ahead and do an impromptu site inspection while I'm here.  I expect to be here between 60- 90 minutes.

I will make a comment to this log entry when I leave

Vacuum pumps and purge air are all normal.  

local gauge indications Vertex MTP (7.7 x 10-7 torr, 1.0 x 10-2 torr), XBM MTP (8.8 x 10-7 torr, 6.9 x 10-3 torr) and YBM MTP (1.1 x 10-6 torr, 8.5 x 10-3 torr)  

SITE INSPECTION:  

1)  JOY fan (HVAC) at X-mid is quite whiney/screatchy and noticeablly noiser than the rest of the fans on site -> I was unable to open the door to inspect as the internals of the door handle seem broken.  
2)  Filler cap on main chiller (ante room?) was not in place, i.e. just dangling. -> I left as found.  
3)  Weld shop door was found to be unlocked -> I locked it.  
4)  VPW above-ground waste water tank must be full as the "RED" lamp is illuminated.  

1705 hrs. local -> Kyle leaving site now, no one else here at this time.  

0.85Hz Peak on the ETMX-ISI

Over the last week we have noticed an anomalous peak in the amplitude spectrum of various sensors on ETMX-ISI, reminiscent of the 0.6Hz peak on HAM 2(?) back when

Looking more closely it seems to be mostly showing up on  a few of the CPS channels, St1-H1, ST2-H2 and H3, see the attached screen shot. This data is with the loops on