I turned it back on and turned off the audible alarm, as it is no longer in a clean room.

This morning I find no pressure drop from yesterday morning so I opened the second side of BSC1 and BSC2 to the pressure gauge.  Maybe we'll have some info later today.

The laser tripped last night due to low flow from the diode chiller. This morning the chiller room was leaking water and I found a broken fitting inside the water tank, where water had been leaking out. I pulled the broken piece out and will install a new one hopefully tomorrow.

30mph winds all day

0800 - PSL offline; issues with diode chiller flow interlock. Michael R investigating; may need to order replacement fitting before PSL can be restarted.
0810 - Filiberto running cables in H1 electronics room and along HAM2/3.
0800-1600 Apollo crew at EY (chamber cleaning).
0930 - Corey working in LVEA eastbay.
0930 - Contractor onsite to remove old shipping pallets and crates.
1000 - Hugh in LVEA looking for HEPI issues/leaks.
1050 - Betsy working in HAM2.
1145 - Catering service onsite.
1345-1600 - Michael L and visiting scientists touring Staging, VPW and EY buildings.
1400 - Apollo installing cleanroom and work platforms over BSC2.
1547 - Mark B and Arnaud restarting multiple SUS user models after creating changes in IPC connections. No conflicts with other users expected.

Work platform assembled around BSC 2 and clean room in position over both. It is starting to look like the most likely position for the E - module is going to be in the beer garden. ICC continuing with first vacuum complete and 25% of wipe down. Generally 2-3 wipes are sufficient, which is better than I had expected.

This morning, Fil finished running the external PR3 and PRM cables from the chamber feed thru (port D3) to the R1 rack.  Travis and I then connected the internal quadrapus cables from the PR3 and PRM to the D1000225 SRS cables that run down the ISI to the inside of the feedthru port.  The signals all seemed to come out in the appropriate places on medm so so far, so good.  We laced and stowed the cables for PR3 and then suspended the mass to verify the health of it's signals.  The M2 and M3 stage OSEMs were not perfectly well aligned, so the chamberside table is not as well leveled as the ISI, causing the suspension to hang differently in the cage now.  We tweeked a few top BOSEMs such that we can take TFs in prep for IAS alignment in a few weeks.  (The M2 and M3 stage OSEMs don't get aligned until after that alignemt).

In order to work on PR3 I had to stand in the beam tub on the HAM3 side of the HAM2 chamber.

While there, I also:

Picked up the older witness plate that was in the beam tube near HAM2.

Moved the newly placed witness plate (laid a few days ago) into a metal holder since it was vulnerable to breakage from standing near it.

Relaced the 4 SRS cables for CB1 and CB2 (PR3 connections) up the ISI, taking care to not ground between the ISI stages.  I did not have nearly enough slack to place the CB brackets in their appropriate spots on the table so I needed to pull from underneath the ISI and reclamp down the slack.  The cables I moved were laced up the NE corner of the HAM2 ISI.  SEI will make sure the lacing is appropriate when they test later in the month.

Added metal face shields to the PR3, MC1, MC3 - HR side of the suspensions - all are freely suspended though.

The login server for ssh access to the DTS has been changed from x1login to x1dtslogin.  The x1dtslogin uses ligo.org authentication of users.  To access the DTS, users still need an account to be created by the local system administrator.

 

The default NDS for the control room computers has been changed from h1nds0 to h1nds1.  This takes effect with any new shell opened since 11:15 PST today.

Lost about a PSI over the weekend and have been unable to find any leaks since Tuesday.  I have again shut all the valves I can, except those leading to BSC3, to help locate the problem area.

WP 3727, Alex, Dave, Jim

at 10:14 we shut down h1dc0 and replaced it with the new h1dc1. Jim activated a second 10GBE port on the H1 FE-DAQ switch and ran a second 10G FMM line to the DAQ rack. The new h1dc1 has three 10GBE pcie cards (compared with only two in h1dc0). The extra card allows the front ends to split their DAQ data over the two cards. Since each card has 16 MX end  points, and LHO will have a total of 31 front ends, this means that we can ensure that no two front ends share an end point and interfer with each other's DAQ data on reboot.

The 10GBE PCIe card arrangement as seen from the rear of h1dc1 is

The pci bus mapping put the output card (connected to the Fujitsu switch) between the input cards.

The MX startup script for the front ends was modified such that the FE sent data to card IN1 or IN2 depending upon their location in the rtsystab file. We restarted all the front ends MX Streams (did not require any model restarts) and all DAQ data was back by 11:34

To test the new system we power cycled various non-dolphin and non critical front ends: h1pemmx, h1susauxb6 and h1susauxb123. During each reboot no DAQ data on any other system went bad.

Alex then upgraded the h1fw1/h1nds1 system and installed the following

• new frame-cpp to speed up frame file reads
• archive current raw-minute trend and start writing those files anew
• new Chan STAT status per channel in the frame files
• IRQ balancing over all CPUs

Tests between the unmodified h1fw0 and the new h1fw1 systems show significant speed up in trend data retrieval. Speed up in minute trend writing quickly dissipated.

Attached are plots of dust counts > .3 microns and > .5 microns in particles per cubic foot requested from 5 PM Feb. 21 to 5 PM Feb 22. Also attached are plots of the modes to show when they were running/acquiring data.

Data was taken from h1nds0.
1440.0 minutes of trend displayed

System is still sealed and I have only a few connections left to snoop.  The leak is very small and may be a non-issue.  I capped some drain and vent points this afternoon in case it is the valves that are passing some gas.  There are also the accumulator bladders...maybe I can check for those...

In the famous words of a Mr. Kissel: "BOOM!"

Today's installation of PRM went extremely smoothly, as if we've had practice at this.  No issues with any hardware or the placement of the suspension using the install arm and cookie cutter template.  PRM is on it's spacer and all dog clamps are securely holding it to the ISI table.

Filiberto is going to finish running the external PRM/PR3 cables from the D3 port to the satelite boxes and we'll start plugging in the suspensions in the afternoon.

Pictures can be found on ResourceSpace near the one attached.

https://ligoimages.mit.edu/?c=1280

• Ski finished servicing OSB fans
• Apollo has continued to install work platforms at BSC2 and to clean BSC10
• The cleaning crew has worked on the EX TMS lab
• Micheal Rodruck was notified midday that the PSL power watchdog had tripped
• PRM went into HAM 3
• Sustained winds of 30 mph throughout the day, gusts of 50.  Tumbleweeds are gathering.

The chamber cleaning crew got the first half of the chamber floor brushed this morning. The surface is very rough and is ruining brushes in short order so work is a little slow. The second half of the floor should be completed by the end of the work day. We'll start vacuum-wipe down-vacuum on Monday.

Bubba, Mark L. and Eddie determined ideal placement of the four sections of the work platform yesterday. Today, the crew carefully craned the sections into place (mostly very tight spaces) around the chamber: this involved removing some cable trays and accelerometer plates so sections would fit. (Thank you, Richard and Hugh.) The sections were coupled together and then braces were installed to maintain some space between the work platform and HEPI.   

The cleanrooms in the TMS lab space have been assembled for a couple of weeks. Today, the technical cleaning crew got a chance to begin deep cleaning in preparation for staging optics tables etc.

The 10-4 torr*L/sec leak on BSC5's dome outer O-ring has been located and marked with white tape for future reference -> This leak will have to be addressed at some point in order to pump this volume with the nominal ion pump, i.e., BSC5's dome will need to come off -> This looks to be the only appreciable leak for this annulus volume -> Also, the venting of this annulus space did not affect the 1 x 10-7 torr pressure indicated on PT510B. 

I improved the 2 x 10-6 torr*L/sec leak of the IP12 gate valve bonnet via - "wait for it!" - TIGHTENING the bonnet screws (it's what I do - required turning down the o.d. of a 13mm socket to a very thin wall thickness) to a more tolerable 1.5 x 10-9 torr*L/sec.  Some of these screws were found to be very loose - others, not so much.  This make/model of valve used to isolate the 2500 L/sec ion pumps have noticeable as-built QC issues.  Among these are the use of hex-head cap screws for the bonnet joint instead of 12-pt cap screws-resulting in damning interferences which prevent the use of unmodified tools.  I suspect that the as-found loose screws were loose due to these tool interferences.  I'll scrutinize these joints (site-wide) as opportunities present themselves - chances are others are leaking for the same reason.