LHO TCS maintenance tasks (day 3) per T1700136:

1. Synchronize Guardian between sites [AH]:
2. Automated heating beam profiling [AH]:
3. Investigate glitching H1CO2Y flow meter [AB/AH]: (see aLOG 38811)
4. Install flipper mirrors and annular heating beam masks [AB/AH]:  (see aLOG: 38812)
5. Make CO2 power cable feedthrough more rigid 
6. Install summing chassis
7. Update operating system to Debian for HWS. Start with ETM HWS
8. Add HWS image viewer (see aLOG 38774)
9. Clean up TCS MEDM screens (see aLOG 38774)
10. Modify RH drivers to work as three wire RTDs (ITMX, ITMY, ETMY). (see aLOG 38785)
11. Transfer spare CO2 RTDs to laser surface. (see aLOG 38806)
12. Adjust flow rate sensor to have same settings at LLO - averaging set to 5s (CO2X see aLOG 38793, see aLOG 38809)
13. Add temperature estimate to ring heater in Beckhoff (measured resistance vs nominal resistance).

TITLE: 09/27 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: Vent work ongoing
LOG:

• 15:10 Jeff B to end station compressor rooms to check on dust monitor vacuums.
• 15:25 Aidan to LVEA to check on TCS flow meter
• 16:30 Travis to LVEA to BSC3
• 16:31 Jim and Hugh to LVEA
• 16:40 Jeff B back and then headed into the LVEA to start temp. oplev with Jason
• 16:56 Travis out. For now...
• 17:25 Cheryl to LVEA, HAM2/3
• 17:40 Alastair, Greg G to LVEA TCSX
• 17:51 Hugh and JIm out
• 18:11 Karen, Vanessa to EX
• 19:48 Travis, Betsy to BSC3
• 19:53 Alastair to TCSX, local laser hazard
• 20:02 Fil to LVEA to check electronics for Betsy, Travis
• 20:08 Hugh to start HEPI pump work
• 20:16 Aidan to LVEA to TCSY
• 21:02 Travis out
• 20:41 Cheryl, Ed to LVEA. Corey tansitioning to laser HAZARD
• 21:11 Corey to LVEA to help Cheryl, Ed and also to optics lab.

I've been having a look at the CO2Y flow meter issue (aLOG 32230). If we look back at the flow rate through July of this year, we see several periods where the "flow" has dropped by up to 30% (see attached time series showing H1:TCS-ITMY_CO2_FLOWRATE). There is zero change in any of the corresponding temperature sensors (laser, manifold, beam dump - all of which are attached to things that are cooled by the water), neither do we see anything in the laser output power.

We know, from measurements at LLO, that we expect the temperature of the laser to change in response to a change in flow rate. For example, we saw a 0.4C decrease in temperature in the LLO laser in response to the flow rate increase of 0.6GPM. There is nothing remotely commensurate here at LHO when the "flow" drops from 3.1GPM to 2.6GPM in mid-July.

There is a single observed drop in temperature around July 18. However, close examination shows that this does not correspond to change in flow - the nearest change in flow rate is approximately 19 hours earlier.

This leads me to believe that the flow rate itself is unaffected and that the electronic interface to the flow meter (the CO2 laser interlock controller) is most likely the source of the problem.

Attached are my notes from Tuesday and today surveying the HAM3 ISI Optical Table and the HEPI Piers.

The ISI Optical Table in HAM3, very similar to HAM2, is tilted down from SW to NE about 0.5mm

The HEPI Piers, like at HAM2, are essentially unchanged during this full corner station sans diagonal vent.  The changes are in the noise of my measurement resolutions and I see the NW change of -0.4mm as an error on rod zero or reading.

Bottom Line: The level of the Optical Table is tolerable to IO and there is no indication that the vent has appreciably changed the tilt of HEPI => ISI Stage0.

Addressing the ISIs' table level would require changing locker shims and table balance; or, refloating HEPI and relocking to untilt the table.  Both doable, but neither fast--at least a day.

I turned on the internal averaging of the CO2Y flow meter. It is now set to 10s. Note that this is longer that the H1-CO2X, L1-CO2Y, L1-CO2X which are all set to 5s averaging. Given the proclivity of the CO2Y flow meter to glitch - which we think is electronic. This should provide some protection against a transient glitch knocking out the laser.

I have updated H1CDS_POST_O2_OVERVIEW_DETAIL_CUST.adl MEDM screen (launched from the SITEMAP) to show the latest front end models and insert placeholders for new models which will be installed soon as part of SQZ install.

The main differences are:

DAQ area moved to lower right to make room for the new SUS models

ASC shrunk due to losing two models

LSC placeholder for new h1sqz model

h1sushtts added to h1sush2b

placeholder for new h1susopo model on h1sush56

svn version information moved to title bar

h1fw2 added to DAQ area

I torqued the bolts on the IM1 tower, and found many that were loose enough that I could easily get them to travel one quarter of a turn before they tightened up.

The bolts were 1/4-20's on the sides of the towers, and 8-32's on the sides, back, and top of the towers, and some smaller screws that hold the EQ stop brackets.

The 8-32 screws on the top of the tower that moved by one quarter of a turn, included every bolt that is associated with the blade spring attachments and alignment.

The LENGTH signal changed by about -25, PITCH changed by about -300urad, and YAW didn't change.

In my initial inspection, before torquing bolts, I saw sufficient space between all EQ stops and the optic, and between the upper and lower magnet assemblies, so no evidence of a direct mechanical interference.

Plot of the OSEM changes is attached.

Per LLO aLOG 36022, I've added external temperature sensors to the CO2 lasers. The channel they are attached to are H1:TCS-ITMX(Y)_CO2_TEMP_SPARE. These names will eventually be changed to TEMP_LASER_EXTERNAL. They are clamped in place on the top of the laser chassis immediately behind the front end of the laser.

They are reading back temperatures of 19.65C and 20.02C for CO2X and CO2Y, respectively.

I think I gave Jeff bad info yesterday and the h1sushtts model had a DAC identification issue which I fixed this morning. All models on h1sush2b were restarted as part of this investigation.

We need to check if the new h1sushtts model's burt restore and SDF files are correct.

Monthly dust monitor vacuum checks. FAMIS #7517
   
   CS and End-Y pumps and vacuum system are good. Made minor adjustment in the End-Y air bypass to add more air flow over the pump.

   End-X pump has failed. The pump motor is OK but not pulling any vacuum. Have swapped out the old pump and installed the backup. Will rebuild the old pump for a spare at first opportunity.

TITLE: 09/27 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: 2mph Gusts, 1mph 5min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.13 μm/s
QUICK SUMMARY: Plan for today includes: HAM2/3 IO work, BSC3 ITMX removal, HAM5 SRM optic swap, HAM5 feedthroughs, TCS local lazer hazard.

HAM2:

• MC1 iris installed
• MC1 clamp that registers the iris position appears to interfere with the new HAM ISI baffles, not yet adjusted
• MC3 iris installed, position adjusted
• MC3 clamps that register the iris position and stay on the table were adjusted so that they do not interfere with the new baffles
• MC3 trans iris installed

HAM3:

• MC2 center iris, not installed today
• MC2 new iris: iris #2, 16 inches in the -X direction from the center iris position, marks the incoming beam from MC1

With these irises installed, IO is ready for the beam from the PSL.

WP7162 Daniel, Jeff K, Fil, Dave:

h1susauxh2 model was modified by Jeff to add the RM1,2 monitor channels to the spare channels on the first ADC.

h1sush2b had many things happen to it:

I added a 16bit DAC card to the IO Chassis. I took the opportunity to reorder the cards in this chassis to match our standard layout. Detailed drawing is forthcoming.

Jeff changed the h1susim model to remove oplev signals. He "moved" h1sushtts from h1asc0 to h1sush2b by stripping out the OM and ODC parts and modifying the CDS block. This model used to accept ASC IPC channels via SHMEM when it was resident in h1asc0. These channels were changed in h1asc to be PCIE (Dolphin) instead of SHMEM. I hand edited H1.ipc to remove the SHMEM versions so the PCIE could be created. h1asc model was recompiled and restarted.

I went through the "add a model" instructions to re-introduce h1sushtts to the system now on a new front end computer (rtsystab, daq master, etc).

A DAQ restart captured all the above changes.

restarts are timestamped below:

2017_09_26 14:20 h1susauxh2
2017_09_26 15:18 h1iopsush2b
2017_09_26 15:18 h1susim
2017_09_26 15:35 h1susim
2017_09_26 16:40 h1asc
2017_09_26 16:47 h1sushtts
2017_09_26 16:49 h1sushtts
2017_09_26 16:54 h1broadcast0
2017_09_26 16:54 h1dc0
2017_09_26 16:54 h1fw0
2017_09_26 16:54 h1fw1
2017_09_26 16:54 h1fw2
2017_09_26 16:54 h1nds0
2017_09_26 16:54 h1nds1
2017_09_26 16:54 h1tw1
 

While teams worked on projects in HAM2, 3, and 5, we started working towards ITMx lower QUAD extraction this morning.  Mark D, TJ, Travis and I spent 2/3 of the work day installing the BSC install arm on the west side of the door on the BSC3.  We then loaded it up with the 5-axis stage and the elevator.  All went well.

Travis and I then went in to start the disassembly of the ITMx suspension, removing top stage BOSEMs, plates, and cams, then lifting and lowering stages in order to make slack on the UIM-Top Mass wire segments.  We added shields everywhere.  Tomorrow Travis will work on decabling the reaction chain lower masses and detaching the wire segments.  I'll redirect effort to the SRM optic swap for the day.

Shot elevations with the Optical Auto-Level on the HAM3 Optical Table--Will report separately.

HAM5--All Damping installed except the Horz GS13 Can damper on Corner3 East Side tucked into the space with the HAM6 Septum.  B&K hammering was completed and TMDs await retuning.  The Blade access walls have NOT been replaced.  Once TMDs are ready, will need about 2 hours to get all back buttoned up.

MISC--Packed a couple CC wafers away.  Pulled ISI Oplev Mirror, undogged SR3 front baffle-it is still on the table.

LHO TCS maintenance tasks per T1700136:

1. Synchronize Guardian between sites [AH]:
2. Automated heating beam profiling [AH]:
3. Investigate glitching H1CO2Y flow meter [AB/AH]:
4. Install flipper mirrors and annular heating beam masks [AB/AH]:
5. Make CO2 power cable feedthrough more rigid 
6. Install summing chassis
7. Update operating system to Debian for HWS. Start with ETM HWS
8. Add HWS image viewer (see aLOG 38774)
9. Clean up TCS MEDM screens (see aLOG 38774)
10. Modify RH drivers to work as three wire RTDs (ITMX, ITMY, ETMY). (see aLOG 38785)
11. Transfer spare CO2 RTDs to laser surface. Account for all RTDs on table
12. Adjust flow rate sensor to have same settings at LLO - averaging set to 5s (CO2X see aLOG 38793)
13. Add temperature estimate to ring heater coil.

I set up the averaging on the internal menu of the CO2X flow meter to 5s per LLO aLOG 35984. The CO2Y flow meter is inaccessible right now with BSC3 being open.

The effect can be seen in the attached image.

I went and checked the cables from the ring heaters where they are attached to the RH drivers in the CER. I wanted to confirm what pins are connected correctly to the RH RTDs (out of the 4 wires that go to the RTD) - see D1200505. The following tables summarize the measurements.

Conclusions: ITMX & ETMY RH RTDs are not salvageable. 

ITMX

ITMY

ETMY

TITLE: 09/22 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Planned Engineering
LOG:

14:51 UTC Karen to LVEA
15:40 UTC Corey to LVEA to move the baffle removed from HAM3
15:44 UTC Gerardo to LVEA to turn on purge air connection at HAM3
15:51 UTC Corey back
16:00 UTC Gerardo back
16:37 UTC Hugh to HAM3 to work on ISI damping with Jim
16:50 UTC Jeff B. to LVEA to survey supplies
17:32 UTC Betsy to LVEA looking for parts
17:48 UTC Dave to CER, WP 7162
18:23 UTC Betsy back
18:34 UTC Untripped HAM4,5 ISI WDs
18:34 UTC Dave back
19:10 UTC Robert to BSC chambers for visual inspection
19:20 UTC Dave powering up ASC
19:38 UTC DAQ restarted
20:00 UTC SUS BS WD tripped. Reset.
20:08 UTC Travis to BSC area to drop off equipment.
20:12 UTC Jeff K., Hugh, Jim to HAM3 for B&K measurments. Jeff K. then to BSC for violin mode measurements.
Peter to PSL enclosure
20:39 UTC Jason to optics lab to retrieve parts
20:45 UTC Robert back
20:52 UTC HAM5 ISI WD tripped. Reset. Tripped again. Left tripped.
21:29 UTC Peter back
21:47 UTC Travis to bier garten to help with violin mode measurements
Delivery from RDL for Gerardo through gate. Kyle received.
22:07 UTC Cheryl to optics lab

Jeff and Jim back, Robert to BSC chambers

23:27 UTC Reset ITMX SUS WD and rerequested ALIGNED. Reset HAM5 ISI WD.