Cheryl, TVO, Daniel 


The TCSX and TCSY CO2 laser verbal alarms were triggered even though they were off because the controller box was powered down causing the flowmeter readback to reach negative values. Both controller boxes were turned on and the flowrate reached nominal values but verbal alarms still persisted. To silence verbal alarms we raised the alarm condition of the CO2 laser powerhead PD from 5 watts to 10 watts. This cut out most of the alarms but the attached figure shows that the laser powerhead PD channels still glitch above the threshold. 

Summary by building:

• EY: ion pump removed, leak found, ISI software watchdog investigation, no changes
• MY: a few visits, in the detailed list of activities
• CS: VAC mechanical pump during the day, valved out overnight, BSC3 ISI electronics investigation, PSL work
• MX: no activity
• EX: reinstall of ETMX, TMSX is damped

Detailed Activity List:

• 10-04-18 15:18 Mark and Tyler to EY to remove ion pump
• 10-04-18 15:25 JeffB to LVEA for PSL plumbing
• 10-04-18 15:35 Chandra to LVEA to valve in a pump on the vertex
• 10-04-18 15:37 JeffB out of LVEA
• 10-04-18 15:44 Betsy, Calum, others, to optics lab to look at the microscope
• 10-04-18 15:45 Hugh to EY to work on the ISI
• 10-04-18 16:04 Chandra and Gerardo and Kyle to EY for ion pump and leak check
• 10-04-18 16:15 Mark to HAM6 rack to add nuts to SMA connectors
• 10-04-18 16:20 Fil to BSC3 to check electronics
• 10-04-18 16:20 Ed to LVEA
• 10-04-18 16:27 PeterK and Ed to PSL 70W amp install
• 10-04-18 16:49 Karen to MY
• 10-04-18 17:00 Paradise Water
• 10-04-18 17:16 GregM starting DMT work
• 10-04-18 17:21 Betsy and Travis to EX for quad reinstall
• 10-04-18 17:32 Dave and Hugh restarting EY ISI
• 10-04-18 17:32 Patrick restarting CS Beckoff
• 10-04-18 17:36 Fil done with BSC3 eletronics check
• 10-04-18 17:40 Mark to MY to pick up parts
• 10-04-18 17:41 delivery for Bubba - Apollo
• 10-04-18 17:41 Paradise Water - done for today
• 10-04-18 17:48 Karen done at MY
• 10-04-18 18:11 Hugh to EY - continued work on ISI electronics
• 10-04-18 18:22 DaveB EY ISI AI chassi is being turned off for testing
• 10-04-18 18:38 Tyler to HAM7 looking for hardware
• 10-04-18 19:06 Kyle rolling up Large Equip Access door
• 10-04-18 19:21 Carlos restarting Nuc5 - no DMT connection
• 10-04-18 19:21 Peter and Ed out of the PSL
• 10-04-18 19:22 Hugh back from EY
• 10-04-18 19:22 Tyler out of the LVEA
• 10-04-18 19:27 Hugh to EY to turn on the AI chassi
• 10-04-18 19:33 Cheryl reset ITMX ISI watchdogs - ISI is Damped
• 10-04-18 19:36 JeffK and DaveB rebooting ETMY iop model
• 10-04-18 19:36 Kyle done with the rollup door
• 10-04-18 19:37 Betsy and Travis back from EX
• 10-04-18 19:57 DaveB/Patrick DAQ restart for Beckoff
• 10-04-18 19:59 Cheryl untripped TMSX - put it in Damped - was in Aligned
• 10-04-18 20:02 Cheryl put ITMX in Damped - was in Misaligned
• 10-04-18 20:03 Fil done at BSC3 SEI electronics check
• 10-04-18 20:04 DMT patch-restart-reconnect in CR is complete
• 10-04-18 20:18 Travis and Betsy to EX
• 10-04-18 20:19 Sebastian to LVEA to get a CO2 laser control unti
• 10-04-18 21:40 Travis and Betsy to EX
• 10-04-18 22:07 ITMX to Aligned
• 10-04-18 22:20 Chandra - valved out mechanical pump in vertex
• 10-04-18 22:28 Delivery for Bubba
• 10-04-18 22:29 Hugh and DaveB EY ISI configuration and electronics restored
• 10-04-18 22:30 nuc5 and video1 restarted
• 10-04-18 22:33 checked VAC alarms with Chandra and Gerardo - OK as of 22:33UTC
• 10-04-18 22:37 verbal alarm about pressure high at BSC2 came in at 22:33UTC - result of Chandra turning that gauge on
• 10-04-18 23:00 Betsy and Travis back from EX
• 10-04-18 23:01 Sheila transitioning to Laser Hazard

Today, Travis, Mark and I worked on installing the ETMX lower structure into the chamber.  After it was in, while reassembling cables, we noticed that the test mass was really jammed into it's lower stops - upon further inspection, we discovered that both fibers on the left side (viewed from back of the suspension) were gone.  We started looking for the debris and found it just outside of the chamber on the floor and on the trolley that the unit had been sitting in overnight last night and this morning.  We did not find anything like a bug nearby, but investigation ongoing.  Meanwhile, we're revising the schedule to back up a few steps and start the rebuild.  History of lower structure after it was welded:

- Welded main chain unit sat on it's trolly in weld room for ~a week before we were ready to install it.

- Yesterday, we rolled the covered main chain on it's trolly ~60ft from weld room cleanroom to the staging cleanroom.  We then uncovered it, and lifted it with the genie duct jack and placed it on the reaction chain trolley and mated the 2 units together.  The fibers were intact at this point.  We then covered it again and rolled the whole unit ~10ft from the staging cleanroom to the chamber cleanroom and parked it near the door.  We left the cover on it and the genie duct jack parked around it with the forks loose around the structure to aid in protection.

- This morning we uncovered the unit, and then lifted the unit off of the trolley with the genie lift and set it up on the install arm elevator.  We then continued with the installation of the unit into the chamber with the arm.  A few hours later we discovered the broken fibers.

All of the above is standard install procedure, with the same equipment (trolly, cover, genie lift, install arm) used in each of the previous QUAD installations.

Since we found the fiber debris all over the trolley and on the ground outside of the chamber on the floor, it must have happened between yesterday late afternoon when we rolled it there and this mornign after we picked it up and set it into the install arm.

WP 7464

Removed CPS satellite box for inspection of pcb DB25 connector, alog 41265. Pads on pcb board are not being stressed. Only thing to note is the connector on the pcb board is not sitting flush to the board. Unit was reinstalled.

F. Clara

WP 7465

Daniel, Dave, Filiberto, Patrick, Richard

I stopped the EPICS IOC that was running on h0epics and moved the DB9 serial cable from the Comtrol to Port 1 of the serial concentrator. This port connects to channel 1 of the Corner MSR L12_13 EL6002. I added the code for the readout of the weather station to PLC1 on h1ecatc1. No channel names were changed. Channels have been added to report errors. These should be added to the medm screens. The code will automatically reconnect if communication is interrupted, for example if the weather station is powercycled. The alarm levels for the wind speed have been put in the database, so a burtrestore is no longer required to set these either.

I also took the opportunity to update the TCS chiller code. It seems to be working without issue.

Kyle R., Chris S. 

Today Chris S. and I took an FTIR sample from the closed gate of the 12.8" GV that isolates IP11 (VAT s/n 0002, see also https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=41353).  Additionally, we opened a new 12.8" GV (in clean room, VAT s/n 0005) and took a comparable swab from the same side of its closed gate.  In both cases, the swiped area was ~20% of the exposed gate surface area.  

Around 1am Thursday 5th April PDT h1iopsusey stopped driving the DACs due to a glitch. I restarted all the models on h1susey to clear this.

Does not go to Sampling when "On" is clicked.

Spun up vertex turbo right before lunch at ~0.6 Torr. Still need to close purge/vent isolation valves (OMC and IMC) and IP3 GV and little right angle valve.

The DMT production computers in the MSR, h1dmt0, h1dmt1, and h1dmt2, have been patched and rebooted. WP 7466 is done.

At ~2256utc on 3 April (or precisely 1206831398gps), all the CPS sensor readouts on both stages jumped to a different value. Eight of the twelve spiked to a 33kish number before going somewhere else.  A few on Stage2 are not crazy numbers but still shifted.  Most on Stage1 are extreme ~positive 8k.  See attached

Another item to be investigated is the Coil Driver Thermal trip hit at 1557utc on the fifth...

I confirmed with Patrick yesterday that the RS232 flow rate for both chillers shows that the chillers are on, and the flow rates are around 3gpm.

The flow rates on the medm are negative, both around -2.5gmp.

Greg's most recent alog 41314 from April 5th says the chiller is running in a small closed loop, and it appears that this is for both TCSX and TCSY chillers.

Kyle, Gerardo, Chandra 

Today we pumped IP11 using a local turbo backed by an aux. cart.  IP11 is isolated from the Y-end via its closed GV.  As I squirted IPA around each CFF joint and vacuum welds of the Chevron Baffle nipple, Gerardo M. monitored the pressure gauge on the aux. cart to see if there was a response.  Chandra R. had already established this to be a very large leak (0.1 torr*L/sec).  We tried "listening" for the audio leak using a device intended for that purpose -> Something seems to be originating from the Chevron Baffle but difficult to eliminate background noise in the room -> We shut down the Clean Room (1417 hrs. local) and that helped a little.  Next, we modified the as-found bag such that each CFF joint was exposed but keeping the nipple's tube vacuum welds within the bagged volume.  We then purged the bag with bottled N2 while spraying helium around each CFF joint -> no significant response.  Finally, we reversed the bagging, now purging the CFF joint(s) while spraying helium around the welds of the nipple tube -> found very large leak coming from the bottom tube-to-flange vacuum weld (nipple s/n 01).  

Having found one leaking Chevron Baffle, Chandra R. examined a different one stored in the VPW.  She found suspicious looking welds.  

Also, we prepared IP11+chevron baffle nipple for tomorrow's removal by venting it with bottled UHP N2 and removing all but (3) ea. of the nipple-to-GV nuts and studs.  Note that with the local turbo spun down and disconnected from the aux. cart, I applied the N2 to the Tee at the inlet of the turbo letting it flow trough the turbo and into the room via the open-ended turbo exhaust line.  This setup would prevent the possibility of over-pressurizing IP11 as it remained open to the room.  I then opened the 1 1/2" vent/pump valve to vent IP11.  Gerardo M. noticed that room air was then entering through the exhaust.  Thus, for a short period, I had been back streaming through the local turbo and into IP11.  I then closed the 1 1/2" valve and removed the turbo. This is a "dirty" pump in that it is not a maglev.  I'll consult Chandra R. as to what, if any action is needed (FTIR?).   

Isolated QDP80 at vertex with pressure at 1.3 Torr. Will resume tomorrow morning.

Chandra has requested that the high alarm level for H0:VAC-MY_CP3_TE202A_DISCHARGE_TEMP_DEGC be raised from 130.0 degC to 140.0 degC (this signal is currently operating at 131.1 degC). This was done and the alarm system was restarted.

Today, Travis and I finished assembling the ETMX lower reaction chain.  We assembled the PenRe mass in the structure, attaching the balance of parts to make the weight from last week including AOSEMs, cables, and cable routing brackets.  We then installed the new annular AERM07 mass below the PenRe in the lower structure and adjusted it in it's 6 DOF's by eye before suspending it.  We then reclamped everything and rolled the main lower chain up to it.  A quick lift via the Genie duct jack and we set the main lower structure and newly fiber'ed masses into the trolley with the reaction set.  We added the UIM and PUM magnets/flags (set with polarities per the QUAD controls poster), and then shoved the 2 structures together and fastened them.

We wrapped the now complete lower unit and rolled it to the chamber side.  After attaching some of the LSAT lifting blocks, we staged the Genie duct jack so that we are ready to install it on the arm and into the chamber tomorrow.