1. Ground loop check

Sheila and Arnaud checked the ground loop from outside and one of the TMSX BOSEM cables was bad. Nothing was done to fix it yet.

2. Putting Pico collars and kapton washers

Though I asserted to Corey that EX picos have collars, I was wrong. We put the collars on picomotors where possible, but there was two picomotors (M14 PIT and M3 YAW) where there was not enough space. See pictures.

Then we put kapton washers to all picomotors.

3. Relieving HEPI bias by rebalancing TMS

Some change in the behavior of SUS guardian seems to mean that the SUS bias is not restored by requesting "align". Because I and Sheila were both unaware of this, we tried to "confirm" our alignment with the HEPI bias on with slightly wrong ETMX bias (turned out later that it was about 30urad too much), and we couldn't quite align the TMS, but estimated from the distance of the forward-going and back-going beam on one of the HWP that we needed 30 urad more headroom to align it. (So things were consistent in the end.)

Anyway, we ended up having to relieve about 300 urad of TMS bias in PIT by moving PIT balance masses on the TMS.

4. Setting up ISCTEX for realigning IR QPDs

First we tried to use Sheila's setup as is, but it turned out that the beam would get too large inside the TransMon telescope.

We removed the lens in the IR TRANS monitor path on ISCTEX and that made things better. After much iterations, we reasonably aligned the IR beam such that the beam retro-reflects from the ETMX and the beam position on the secondary is on top of the green beam within 2mm or so. The  IR beam diameter coming out of the arm is about 6mm on the secondary, so 2mm is not very small but should be good enough to put the beam on QPDs.

5. Aligning the steering mirrors on TMS

Not surprisingly, the IR beam was very close to one of the green beams on the QPDs.

We found that the beam was totally off on the QPD sled and was not making it to the QPDs, but just moving M14 was good enough to bring the IR beam on both QPDA and QPDB. It's somewhat puzzling that people could not center the QPDs using M14 and M4, but again it's kind of hard to turn the right knob for the right degree of freedom because two mirrors are almost degenerate (https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=11897).

Two disappointments were that the beam was bigger than the 3mm QPD (it looks like 4mm or maybe more), and that the IR power seemed to be too small to be useful for centering. The latter was surprising as the OzOptic laser is nominally 10mW, and given the 95% splitter in the path the power on each QPD should be about 10E-3*0.95*0.05*0.5 = 240uW, which doesn't sound terrible.

Anyway, our mission is to bring the IR beam centered on both QPDs within 1mm, and keep the IR path to the ISCTEX at about the center of the clear aperture formed by the chamber/viewport/table enclosure, to make sure that the pico mirrors can take care of the fine centering job without destroying the in-air IR path. We will center both of the QPDs using M14 (pico) and M15 (manual) as good as can be done by eyeballing tomorrow.

Rolf, Jamie, Jonathan, Jeff, Dave

We built h1susetmy against the latest branch-2.9 RCG. Initially we had compile errors, which we tracked down the ODC_CHAN.mdl file (we backed up that file and reverted from svn).

Running both the front end and the CSS diagnostics, we tested them in finding differences between the running configuration and the snap file. Several items were observed and have been resolved. Tomorrow morning we will determine the set of monitored channels (those not being controlled by guardian) for a quad suspension.

ETMY status for tonight:

• The suspension is being controlled correctly (can be damped, aligned).
• The DAQ data from SUS-ETMY is most probably bad until we restart the DAQ (please restart DAQ if data is needed)
• All RCG pointers have been left in the branch-2.9 configuration, please do not compile any FE models overnight.

I removed VLAN 20 from sw-msr-h1fe, and from the link on sw-msr-core.  It was unused, other than to consume bandwidth on the core uplink for broadcasts that would not actually go anywhere.

I finally got tired of watching the hourly autoburts spam everything in the network with broadcasts as it's done since, well, pretty much forever.  So I stood up a small virtual machine to handle this task (aptly named 'autoburt'), the main new difference being a local EPICS gateway process to act as a proxy for any CA requests.  The gateway code caches the channel name -> IOC mapping (for a configurable interval, default 7200 seconds (or if you prefer, '2 hours')).  This means that if we route all the CA requests through this local gateway (listening on the loopback address, 127.0.0.1), it should only have to broadcast for channel names once, as the burt snapshots are taken every hour (thus refreshing the cache).  After the initial broadcast, the only things that should trigger a CA search request are: if a channel moves to a different IOC, if a channel is in a request file but does not exist (such channels are marked 'dead' after 2 minutes in the gateway and unlearned/discarded), or new channels are added.  Since the local gateway process is close to the source of the packets, it can learn the status and location of every requested channel (assuming it's valid), so it does not need to re-broadcast for channels it would never find (as is the case with a central gateway for an individual subnet).  To this end, attached are plots (in bits and number of packets) of the reduction in traffic after making the aforementioned change.  These plots are from the interface for Vlan20 on the core switch, which all the broadcast traffic would traverse.  The initial 'fuzzyness' is the overlap between the new machine taking over and the old snapshots finishing up.  In addition there were some other model changes that made channels unavailable for a bit.  The remaining peaks in traffic are from invalid channels in the autoburt snapshots, which to address I will have to track down the responsible parties and 'educate' them.

One additional change I made is that the 'H1' autoburt now runs at 10 min after the hour.  This give the 'H0' autoburt time to run and finish, and should help sort out if one or the other is having issues.

Yes, it's perhaps quibbling to worry about 500k of traffic (a whole 0.05% of 1Gbps!), but the previous behavior was just dumb and I wanted to look at something prettier.

11:15 Mike - going into LVEA
11:17 Keita – Transition End-X to laser safe
11:56 Gerardo – Going to End-X and End-Y
12:31 Nichole – In LVEA and Optics lab looking for parts 
13:24 Matt – Working on IO alignment
13:35 Keita – Going to End-X
13:57 Corey – Looking for cables in the LVEA
14:00 Mike – Taking DetChar group on LVEA tour
14:18 Keita – Transition End-X to laser hazard
15:10 Jeff – Chiller water level good

(Sheila, Daniel)

We installed 2 MCL PZT drivers, 2 PZT steering mirrors, a DE-to-SE driver chassis, and associated cabling in EY. The ISCEY model updates were already introduced during the last maintenance perdiod. The electronics and software are turned on and ready. The DAC outputs to the MCL drivers have been tested. The mirrors still need alignment once ETMY is back under damping and aligned. A simple integrator has been loaded into the new filter modules. Documentation can be found here.

Staging building seismic test stand - Restarted both models and the framewriter and nds processes to get the time sync'ed properly.  Tested using diaggui to do a transfer function, test passed.

Went down to EX after lunch and locked the ISI, after Hugh turned off HEPI offsets. I had to move one of the witness plates on the floor, because I had to slide under the suspensions to get to the far side of the chamber. To reach the lockers, I had to steal a clean-er stool from the LVEA from around HAM5, as our regular in-chamber stools have been mis-placed, wiped it down multiple times, and foiled the base. Wherever this stool came from, we should get a couple more because it was the perfect height for this job. Slid nicely under all of the suspended obstructions, but tall enough that I could reach the lockers. I left the stool down there sitting outside the chamber in-case TMS needs it.

Although I did not really find a smoking gun on SR3, I moved a few EQ stops back and recentered one middle stage OSEM (LR).  Now, V and P TFs seem healthy.  Moving on.

Kyle came out and checked the purge in the LVEA in light of the fact that we removed the dam - he reports that it is "normal" and functioning as best as it can.  Note, he also reported that he checks it every other day.  Good.  

To all:  Please alog if you are adjusting any purge - I'm trying to catch a phantom.

Before doing much in HAM2, but just after APollo worked on "bib around door":

0.3 um  20

0.5um  10

1.0um   0

In the midst of beam hunting this morning, we started quick TFs on SR3.  We immediately see some rubbing as V TFs don't look healthy.  I took a quick glance at the SUS and did not see anything obvious.  Aargh.  Back at it after a quick lunch.

In an attempt to resume alignment of the output HAM optics, this time with the aligned ITMy, we unshuttered the PSL beam and entered HAM5 to look for it.  We found nothing.  Tracing steps backwards, we seem to find that the bypass optics near MC3 got brushed yesterday during the ground look hunt.  The PSL beam hits the monument on the wall a bit off in yaw.  So, we'll need to reflash the MC and tweek up the alignment of the bypass.  Kiwamu has already adjusted the power leaving the PSL down to 200mW.  After lunch, we'll start again.

Jeff and Andres spent the morning aligning the SR3 2 lower stage OSEMs.

The opportune shut down of the HEPI Pump during the vent allowed the HEPI Mechanical to respond to the change of state.  The Z & Y dofs trend 10s of um with the Y sliding 60um.  X waffled around in a window of 3um so basically didn't move.  The yaw and tilts are a couple to 15urads so again maybe nothing.  See the attached trends remembering the local sensors these are derived from are from the top of the SEI Piers to the suspended HEPI.  So, there is most likely coherent motions relative to the floor that these don't see.

Last Thursday, I modified the allowed PV list to further exclude FMCS channels which do not exist in the vacuum subnet (/H0:FMC-.*_H2O_PRESS.*/ rather than /H0:FMC-.*/).  Attached is a plot of the corresponding reduction in broadcast traffic in the vacuum subnet.  The second plot shows this change (in 'Week 28') relative to the previous change (in 'Week 27') that eliminated most of the redundant broadcasts for reference.

	At essentially the exact same time as the EndY shutdown reported yesterday, EndX HEPI Pump Station stopped its output with a OV3 error.  Suppose this makes sense.  The LVEA road through this fine.  Pump Station restarted in the documented manner. 

Laser Status:  LVEA-HAZARD, EX-HAZARD, EY-HAZARD

(covering Morning for Jeff B)

• 7:58 SR3 AOSEM Alignment (Jeff, Andres)
• 8:00 Cleaning at EX BSC9 & Door will be removed next (WP#4733)
• 9:12 ITMy alignment work (Jason/Doug)
• 9:42 SR alignment work (Matt heading out)
• 9:43 ex HEPI trip, Hugh addressing--->completed at 10:45
• Praxair will be on site around 10am
• 9:55 Jason/Doug completed their alignment check of ITMy for output alignment check (left a yaw bias of 40)
• Dam between BSC1/2 being removed for SR alignment work (Betsy/Travis)
• 9:59 EX transitioning to Laser HAZARD (will go to Safe/Hazard a few times today!) [Keita]
• 10:20 Nathan beginning work in Optics Lab
• 10:25 Laser Safe activities finished up in LVEA
• 10:35 LVEA transitioning to Laser Hazard

Today, Travis and I worked on aligning the main chain of the ITMy QUAD to IAS tolerances.  We first tackled some coarse yaw, then used pushers to push the structure in the +x direction to fix a ~3mm error in the lateral position of the optic.  (Some of this error was due to misplacement the first time we set this QUAD on this ISI.)  We then continued on pitch and more yaw and have finished the day with the optic within tolerance in position and pointing.  We will start transfer functions to check for the suspension health, but will likely hand off to SR3 output alignment checks with the PSL beam before continuing on with this QUAD.  (We have not touched the reaction chain yet, other than to clamp it out of the way of the main chain.)