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

Vac - Chevron baffle work take place Monday contigent on proper valves come in tomorrow.

Sus - New acoustic mode damping device to be installed on ETMY after successful testing at LLO.

Sei - EX; H6 ISI remained locked. EY;EX;H6 HEPI remained locked. TJ reports guardian code is finished.

CDS ELE - POP90 issue still under investigation. Access System workers still working. ISS outer loop chassis to be installed either this afternoon or tomorrow.

PSL - Mode matching after 70W amp to drive back into the AOM/PMC beam path.

Bubba - Work Safely

Yesterday, Travis and Bubba's crew landed on a new VEA cleanroom configuration that allowed for better fiber welding equipment layout.  This involved moving the large install platform staircase out of the VEA and bringing down a slightly bigger 8x10' cleanroom.  We had to fix some panels, and rearrange the laser safety panels, and then the cleaning crew cleaned everything this morning.

Today, Travis and I worked on moving the extracted ETMX lower QUAD unit to the chamberside staging cleanroom using the duct jack, separated the main and reaction chains, then mounted the main half on it's weld trolley.  We removed all of the flags from PUM and UIM stages for safe keeping and re-install later.  We rolled the main chain into the welding room and left the reaction chain to be reworked for the AERM install soon.

The illuminators can now be remotely operated. Under tab SYS in sitemap, select illuminators to enable/disable each individual illuminator.

F. Clara, R. McCarthy, P. Thomas

3 dust monitors not responding this morning. LVEA6; PSL101; EX VEA2;

EX VEA 2 was reset at 16:15 and showing high .5u counts

Yesterday afternoon Terry and I made another attempt at aligning the beam from the OPO into HAM5, but we weren't able to find a beam returning to HAM6.  

We are able to see ZM2 from the east viewport on the north side of HAM5, and we can see the back side off the OFI kickoff mirror that the beam from ZM2 is supposed to hit.  We can tell that for some alignments our beam is hitting the optic holder for ZM2, but other than that we don't really know where the beam is.  

Today we will try with the HAM5 illuminator plugged in, and perhaps repeating the aperture alignment with more care. 

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
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
    Wind: 5mph Gusts, 4mph 5min avg
    Primary useism: 0.08 μm/s
    Secondary useism: 0.26 μm/s
QUICK SUMMARY:

TITLE: 03/21 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: Attached

As we plan to re-open BSC10 on Monday morning, I have restarted the clean rooms at E Y. The cleaning crew will do a cleaning of these tomorrow. 

Thanks for the time to the Squeezer crew!  And to CoreyG for coming back for more everyday.

Pulled the feedthru again and just sitting in the area seemed to change the readout.  I could do some minor manipulation of the cable and send it to the rail and put some pressure and a particular bend to get it to read reasonable values.  Wasn't going to mess with fixing and end up worrying how long it would last--just pulled it and replaced it.  New sensor worked fine and repeatably.

With three working vertical sensors, we got a new locked position, unlocked and quickly balanced the table.  Relocked and only saw a slight shift.  Did a payload consolidation and refloated.  ISI damped and once things were really settled down, Isolated the platform.  Left the ISI locked on stops so SQZ crew could climb around as needed.

CAVEATS:

Unable to milk the new cable through the copper braided shield, will need to disconnect from feed-thru to do that, once I find/get a milking fid.  Need smaller kinder peek zip ties--the big ones we have are just too hard on the small CPS cable which could be contributing to shorting.

I still need to as-build the payload--it is different than last Thursday now.

We need to get an Isolated spectra for closeout.

See photo below--I'll try to get some pointers on it (it is fuzzy too) but you can see where the zip ties a couple inches from the ends have damaged the insulation exposing the inner shield.  There is also some shield visible at the BNC connector--this is where I was able to make it work and fail repeatably.