Jeff and Dave:
late entry from yesterday evening. Jeff made a model change to h1susopo (binary IO) which required a DAQ restart at 17:05 PDT Tuesday. I have just renamed the partial second trend frame file to permit NDS1 to provide date when spanning the gap.
Kyle, Chandra
CP2's bottom fill valve (V1) had an obstuction and was allowing LN2 to sneak past and pressurize and frost the line that truck deliveries use to fill the Dewar. Both top and bottom fill valves felt closed, but Kyle opened and reseated both. Fixed.
Elevated HF in plots is clearly due to work being done in-chambers.
TITLE: 10/11 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: 3mph Gusts, 1mph 5min avg
Primary useism: 0.02 μm/s
Secondary useism: 0.22 μm/s
QUICK SUMMARY:
15:30 Travis out to biergarten with Fil
ITMx:
The first half of the day was spent packing up welding and IAS equipment and converting the space from a laser enclosure welding area to a install/assembly area. I then replaced the middle wire segment (from top mass to UIM) that was broken during the extraction of the lower structure. I also added the UIM non-magnetic blade dampers (NMBDs) to the blades of the main chain and removed the unused copper ECD blocks as per E1600011. We then called Fil in to start looking into an FRS 4509 (ringheater RTD sensor non-functional). Fil will continue this work tomorrow.
ITMy:
With Fil working on RH issues on ITMx and Garilynn visiting this week to commission the new baffle alignment equipment, we redirected our effort to ITMy. We got as far as swinging back the ACB (Note: we had to un-swing-away the ITMx ACB since we only have one wedge, but will hopefully have another arrive in the mail from LLO shortly) and putting on optic face shields. It is NOT locked yet.
NMBDs installed on ITMx are serial numbers 015 and 016.
Pumping on shroud prototype in mech. shop - leaving scroll pump run overnight. Pump is relatively quiet.
I'm covering for Cheryl. Ed covered for me from 8:50 - 10:50. Cheryl covered 12:30- ?. Patrick covered from ?-2:30. And now I'm back to cover while Cheryl heads out to HAM2.
Had "Noise Eater out of range" verbal alarm this morning. Ed mentioned filing an FRS for this on behalf of Jason.
Day's Log Of Activities
As of 23:12UTC: (completed by Cheryl)
Patrick rebooting ISC at EX: Actually h1ecatx1 EPICS IOC (alog 38970).
(Cheryl, Corey, Ed, Keita)
The following assemblies/items were removed today & bagged/tagged:
ROM RH4:
ROM RH5:
NOTE: The 2" HR ("M-38-UNP-53") & Black Glass dump for this one was installed on ROM RH4
ROM RH6:
ROM LH2:
NOTE: A V-Black Glass Dump was installed on the post for LH2.
Misc:
Here is a note Ed wanted me to take while Keita tightens:
1) Tightened screws on top of IM3, and had this:
2) Tightened 1/4-20 bolts (on sides, OSEM plates, etc.), and had this:
Don't be alarmed when you hear a flow of air near GV7. Its compressed air solenoid valve is leaking. Replacement is on order.
Betsy, Jeff B., This afternoon we made a first pass at adjusting the M2 and M3 OSEMs to their mid-light positions. The adjustment went well. They are all within 200 counts of zero. A minor tweak was made to the T3 top OSEM. All these OSEMs will need final adjustments when the beam alignment is made. Betsy tightened the flat head screws on the 25 pin connectors. The loose one may be the source of grounds.
FRS ticket already exists as 5270. Restarted.
Betsy, Hugh, TJ
Last week Betsy put the heater on the table and today Hugh checked it's vertical center with an auto-level. Some washers were added to get it as close to center as possible, which ended up around 0.4mm high. Betsy and I then had to wiggle the assembly into place, and rotate the entire gold ceramic holder to allow the screws on the outside to clear the OSEM brackets. The heater is currently sitting ~6mm away from the back of the SR3 optic and it is plugged into the feed through.
Picture attached.
Here are a few more pics. As TJ notes, the ROC front face is 5-6mm from the SR3 AR surface. It is locked down in this location.
Note, we followed a few hints from LLO's install:
https://alog.ligo-la.caltech.edu/aLOG/index.php?callRep=25831
Continuity checks at the feedthru still need to be made. Will solicit EE for their help.
Initial continuity test failed. Found issues with in-vacuum cable, power pins not pushed in completely. Pins were pushed in until a locking click was heard.
Reading are:
Larger Outer Pins, Heater: 66.9Ω
Inner pair (left most looking at connector from air side), thermacouple: 105Ω
Found center of SR3(-X Scribe) to be 230.2mm above optical table. By siting the top and bottom of RoC Heater, found center to be at 231.4mm. Removed available shim to put center of RoC Heater at 229.6 for 230.2-229.6=0.6mm below perfect.
Hugh's comment reminded me that to get the heater to fit, Betsy and I added a 1mm washer to raise the height of the assembly. In total we have 4mm of washers (2x1.5mm & 1x1mm).
I conducted measurement of quantity 6 of [D1600104 SR3 ROC Actuator, Ceramic Heater Assy] at CIT on 4 March 2016. Dirty state before baking. The serial number of the heater assy installed in LHO HAM5 is S1600180 - see https://ics-redux.ligo-la.caltech.edu/JIRA/browse/ASSY-D1500258-002 S1600180 Resistance = 66.8 Ohms on 4 March 2016. There is good agreement between the as-installed and pre-bake measurements.
With GregG in chamber and JimW helping outside, the installation of the ViewPort onto the -X most Septum Window was pretty straight forward. A new o-ring was used and the window/flange clocking mark was put at 9o'clock (-X) and was torqued in three steps to 16 ft-lbs. Attached photo shows these men in action.
Numbers from packaging: D1101092 SN #3, O-Ring Parker #2-373 C100002
The image attached shows the 5 way cross installed. The Fiber feedthru (currently blanks) are visible below the cross. The five ISI cables are rerouted to FTs on the cross but the in-air cables have not been reconnected. I'll do that after Kyle gives it all a look and touch; fingers cross for leak checks down the road. The facing 25p has no cables but it was readily available, that is why it isn't a blank.
Here are a couple photos with the feedthru protection on and the cables secured. Please be very cautious with the CPS cables going out to the left. The ends of the cable are barely behind the shroud plane and I certainly worry about them.
I've added a button the ISI_CONFIG screen that transitions the seismic systems to a robust state to protect the suspensions during a verly large earhquake, like the infamous Montana earthquake or the recent Mexican earthquakes. It's the red button that says Very Large Earthquakes. This script requests the DAMPED state for all of the chambers with ISIs and switches the gains of the all the L4Cs and GS13s. This button is likely temporary, but is probably the state we want to leave the seismic systems in when no-one is on site in the future. The script lives at /opt/rtcds/userapps/release/isi/common/scripts, and is called SET_EQ.py .
As I recall, being the operator on site for the Montana quake, one or two optics/chambers tripped, and I couldn't see any info on a website or even on the plot of our own siesmometers about an EQ, so at first I didn't know that there was an EQ, I thought it could have been some other kind of a failure, and I only knew it was an EQ when more things tripped.
I'm wondering if, given that scenario, you would recommend that in the next observing run Operators transition SEI if any chamber trips, as a precausion for big close EQs?
Would there be enough time for SEIs to transition before a big close EQ arrives?
If not, is there any down side to having an EQ arrive mid-transition?
The motivation for this code comes from the struggles commissioners had during the Mexican earthquake on Sept 8th, this year. The goal is to put the ISIs into a state where it is as easy as possible to keep the ISI damping loops on. It's a last ditch effort to protect the suspensions. So, even if the earthquake is already tripping platforms, it would be best to make the transition, anyway.
For an earthquake as close as the Montana quake, we won't get any advanced notice. I still would not advocate just switching to this configuration just because some chamber tripped. It takes about 45 seconds for a BSC to go from Fully Isolated to damped and about 2 minutes the other way, and there will still be settings to recover after (because the script switches the gains on ISI seismometers). You will also probably have to run an initial alignment. Some thought should be given to a wall FOM for the live ground seismometer signals to help identify if there is an earthquake arriving on site, unannounced. The low frequency blrms on the wall only update every minute, and are probably too slow to help, but all 3 seismometers seeing large, similar signals at the same time is a pretty good indication.
