WP #7439 - Jeff B. & Dave B. 

   All dust monitors, except End-Y and the Optics Lab are running at a 19200 baud rate. To synchronize the network port speeds across all dust monitors, today upped the End-Y dust monitor network port speed from 9600 to 19200. Reset the dust monitors for the new speeds and booted the Comtrol. Power cycled the weather station. Dave restarted the weather station (aLOG 41124). 

   At next opportune time will do the same for the dust monitors in the Optics Lab. This will have all networked dust monitors running at the same speed. 

    Removed the remains of the house vacuum system from End-Y. The PCV piping and cabling are gone to recycling. Will address the mid stations, End-X, and corner station as access opportunities permit. 

  WP #7440

   Reinstalled the dust monitor VEA-2 at End-Y to cover the door removal next week. As before, it is located inside the BSC cleanroom and the alarms are set for Clean-100.  

Corey & I managed to milk the new V3 sensor cable through a new length of copper braided shield.  We had a 'fid' to help but more than two hands was a big factor as well.  We (I) was unable to get the too large a zip tie snug enough around the cable to hold the braid in position but only at the sensor end.  At the BNC connector end back at the feed thru, we could get all our hands in play and that one is secure.  I have smaller peek zip ties coming from Accu-Glass arriving next week and if they can be ClassA'd in time, we'll use those.  Otherwise we'll have to take the sensor off the platform and snug the tie as we did at the other end with more hands.  I was worried about damaging the cable at the sensor where we can't get enough hands into play to make sure nothing but the zip tie gets reefed on.  The big zip ties just require too much force to close tight enough.

We (I) still need to change the conflat gasket back at the feed thru, as well as the above mentioned cable tie job--next week.

And of course good spectra and any balancing if SQZ crew changes the payload.

We left the ISI locked.

Old Corner 3 Vertical CPS sensor SN 12023; new SN 12015.

Addendum: Since we had already reset the V3 sensor gap, we decided to re-gap what needed it.  The H3 CPS was over 6000 counts and that was the hardest one to access, The other two horizontal sensors were over 1000 counts so we did those too.  For the verticals, we redid V1 which was over 1300cts.

We then did an unlock/relock test and saw that the local verticals shift 200 or less counts whereas the horizontals shifted between 1600 to 2200 counts.  Have to move the lockers to fix that.  Naturally, in the cartesian basis, X Y & RZ have the largest shifts, namely 35000, 75000, & 16000 nanos while Z RX and RY shifted just 3600, 1400, & 5800 nanos.  Resetting the sensors of course require resetting the Isolation Targets--done.

Addendum II: I will put actual redlines on D1201388 but just to put it here in case anyone thinks of a problem, we ended up with 110kg more counter weight than the plan expected by SYS--that's an awful lot of mass the plan was missing.

Chandra requested CP3 ROC cell phone alarms be silenced for the work day. We will silence the regen interlock alarm over the weekend.

following comtrol restart to speed up dust monitor serial baud rate. Burt restored to recover alarm levels.

WP 7438
ECR E1700294

New PEM AA Chassis installed in CER in PEM-OAF rack slot U30-31. Connected to ADC card used for Newtonian Noise Array experiment. Finished removal of Newtonian electronics from TCS rack.

Serial Number: S1800580

TITLE: 03/23 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
    Wind: 12mph Gusts, 9mph 5min avg
    Primary useism: 0.03 μm/s
    Secondary useism: 0.27 μm/s
QUICK SUMMARY:

13:10 Peter is in the PSL continuing 70W alignment to the PMC

14:12 Chris is removing scaffolding from the optics lab to store at MX

Terry, Sheila, Arijit, TJ, 

Today we made one more attempt to get the beam from the OPO aligned into HAM5 and out to HAM6, but we haven't found the beam.  

Keita loaned us a Nikon D7100 which was much better for getting a clear picture of what we were looking at than the viewer we were using yesterday.  Photos will be attached to this alog latter.

FIl also  cabled the HAM5 illuminator up to the new beckhoff controls, so we could turn that on and off.  

We started out by manually aligning the beam again through the apertures, doing a little bit more careful job this time by using the viewer to identify the edges of teh aperature and center the beam half way.  We can still see the beam hitting ZM2 through the HAM5 viewport.  We were also able to sometimes see the beam coming out the HAM5 viewport (perhaps going under the fly-offf mirror on the OFI), but latter this afternoon we weren't able to repeat that.  We were never able to see a beam in HAM6.  

We are leaving the OPO locked and generating a beam (we again have two soft door covers with a small gap to let the beam out).  We have ZM1+ZM2 scanning with an amplitude of 10,000 counts for both pitch and yaw, and SRM scanning 1000 urad.  

If this does not work, we may wait for a beam from the PSL to become available and try to see the rejected scatter from the OFI polarizer in the path towards the squeezer. 

Valved out X-beam manifold turbo and spun it down, so expect vertex pressure to rise. Tomorrow I plan to hard close GV2, vent XBM volume, and start loosening bolts on 10" gate valve.

The mode matched output of the front end laser was aligned into the power amplifier.  After the mechanical alignment,
the power amplifier was turned on at a low diode current to check that nothing was grossly wrong.  When the diode
current was increased to 45 A, an output power of ~84 W was measured.

    The beam propagation was measured and found to be consistent with data provided by neoLASE.  The measurement
is partly messed up by the presence of pump light and a ghost beam from the sampling mirror.  An average beam
diameter of 356 microns was used for the mode matching to the high power oscillator optical path.

    The beam path towards the pre-modecleaner was roughly aligned.  Minor problems were encountered with the fit
of some parts.  I hope to have the pre-modecleaner locked tomorrow.



Ed / Peter

It is with a somewhat heavy heart that I cut the fibers out of the final Hanford ETM to detect the first gravitational waves ever.  We removed the ETMx from the lower structure and stowed it in its cake tin.  The new ETMx will be installed tomorrow in prep for a fresh weld next week.

TITLE: 03/22 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY:
LOG:

13:36 Peter into PSL

14:30 M² (aka Itchy & Scratchy) @ MY VEA

14:38 Jeff B out to EY/EX for photos, reinstall dust monitors for vent and rodent checks - contamination control

15:13 King Soft on site

16:40 Bubba out to EY - to the well

16:40 Jeff B back from Ends and heading out to LVEA

16:50 Betsy and Travis out to EX

16:55 Jeff B back

17:23 Kyle, with Apollo, arrived on site

17:24 Sheila, Arijit and Terry out to HAM6

17:33 Jeff B to ITMY for camera work

17:44 Mark out to LVEA

17:56 Marc back

18:31 Chandra out to MY

18:44 Betsy and Travis back

18:45 Peter out to PSL

18:55 Jeff B back from ITMY - LSO must be informed before transition to LASER HAZARD as the cover is OFF the viewport

20:35 Jeff B out to LVEA

21:08 Betsy and Travis back out to EX

21:45 Peter back

22:09 Jeff B back for the day

Per request, pictures attached of the cryopump bake enclosure installation. The installation took two days and several modifications were made before and after the bake commenced in an effort to create more uniform heat zones within the enclosure because the bottom is not achieving target temp. Modifications include:

• Changed unitrut framing at 10" valve area to make more space for turbo pump assembly, which is pumping during the entire bake process
• Added rockwool insulation in several areas to fill in gappy joints around the 4" thick insulation panels
• Reduced flow rate of recirculating air by adding restrictor plate on 20" return duct diameter in an effort to equalize heat zones within enclosure. Turns out we had a faulty thermocouple which skewed results; retained design flow rate of 2000 cfm to make up for leaks at velcro insulation joints
• Installed 10 kW heater in series to supplement 20 kW control heater which ran at 100% to achieve temperatures above 100C (target temp is 130C)
• Laid 1-2" thick ceramic sheets on top of enclosure to reduce thermal leaks
• Lined "crawl space" below enclosure floor with 2" foam board to retain heat at bottom, with option to plumb in 5 kW space heater
• Activated GN2 regeneration heating system; it ran flawlessly for over a week and then developed some kind of electrical short that we haven't been able to chase down. Flowing hot GN2 through the CP reservoir would help achieve target temperatures and prevent cold spots, but will unlikely be fixed in a timely manner

Improvements for future designs:

• We read out thermocouples in five areas (some air, some metal), but in the future would add more sensors
• The supply air exists into the enclosure directly above the return duct. We could improve heat distribution by supplying hot air from bottom and placing return duct on opposite side of enclosure
• The velcro serves as a good hold for insulation panel installation, but does not ensure that the panels butt up next to each other. Wire tie reinforcement would help bridge gaps where the thin velcro flaps fail to provide thermal barriers
• Install variable speed drive on fan

The ISS box used to be dogged down using CL5 dog clamps, and is now dogged down with CL2 dog clamps, with CL5 dog clamps installed up side down against the base.  One of the clamps installed against the base is a fork clamp, installed as the South fork clamp on the East side of the box, where the ISS box is up against the PMC box, so very difficult to access.  Images attached show each side of the box, and the file names identify which clamp(s) and which side. In the images, the first clamp identified is the North clamp East side, and from there the clamps are identified in a counter clockwise direction, ending with the South clamp East side (which is shown in the last two images).

WP 7436
FRS 4499

The ISS Outer Loop Chassis in PSL-R1 rack was replaced. New unit replaces a prototype unit. Cables labeled ACD_4 and ADC_5 are not connected in new unit. Unit was left powered off.

New Unit S1700062
Old Unit S1600363

F. Clara, M. Pirello

I've looked at 3 consecutive glitches in TCSX QPD B using the _DQ channels added yesterday.  The shape of all 3 glitches are the same, and have a shape that looks very much like a step function (with a second glitch about 3/4 of the way through the first).  To the best that I can measure in dtt, the interval between the first and second glitch is 900.098 seconds, and between the second and third glitch is 900.577 seconds, so 15 minutes +/-0.5 seconds.  Attached plots of the three glitches show that the ISS and RIN signals also see the glitch.  Related alog 41076.

Update on what I did with ZM1 today.

Summary: the UL flag now looks much better, but I dropped a screw down into the ISI and I topped out some adjustment screws.

After talking with Jeff K this week about what might be going on, I remembered that the UL OSEM flag was slightly askew from the other flags. Jeff's data may also point to a problem coming from that area so I wanted to see if I could straighten or align the flag today. I pulled the flag and rolled it on the table and you could see that the tip of the flag was not straight. I replaced it with another that I had brought with me and it looked slightly better, but still not great. Roll tested this one as well and all looked good, hmm. So I put it back in and then tried to move the OSEM in the desired direction with some success. All the flags now seemed to sit a bit lower, so I adjusted the height but I found that the screw to lock down this adjustment couldn't reach anymore. I'll have to get some longer ones tomorrow. Overall, the UL flag is now much more centered and the others are good as well.

As I was putting the earthquake stops back on I fumbled one of the 4-40 screws and dropped it right down into one of the through holes on the table (I blame the gloves). I could not see a way to get to it without removing one of the HAM side panels, so I will consult with SEI team and take action tomorrow.