There is an accelerometer on top of HAM2 that is just laying on its side.  It obviously had been glued to the SS at some point in the past as there is a remnant patch of glue in close proximity.  

   Ran quarterly check on dust monitors. All test out OK. Adjusted vacuum pump flow rate in the CS and at End-X to bump up the flow rate. 

   Could not check the monitor in the Diode Room as the access card is no longer in the control room key box. Will get with the LSO for access.  

 

IO and TCS/HWS Tables are back in place and being aligned.

VAC

     CS pump down is around 10-6Torr. ITM TMDS is waiting till we are confident that we will not have to vent again. Vac crew wants to pop off the HAM6 S door to place a stopper so the HAM5 doors can be tested. Monday morning hard closing MY gate valves. Hoping to vent EY early next week. North door will be coming off and the clean room is set up. Will need to isolate Y-beam manifold to leak check, perhaps a few weeks out. Short one ion pump in the CS until it is repaired. Kyle will want to commissioning the neg pumps this month, which will be climbing on chambers and running pumps.

SQZ

    Cabling is continuing, what is here is installed but more to come. VIP is still waiting for the OPO and a few other parts before further progress can continue. The slow controls testing in the SQZr Bay for the table can start. Siskyou mounts being built in the Opt Lab.

COMM

    IMC locking this week. OM alignment, DRMI, and peak down the arm coming up in the next week or two.

SUS

    Jeff K has been running transfer functions on the vented sus and checking for rubbing and other issues.

CDS

    Security patch needed, this will mean that all control room work stations and many of the CDS machines will need reboots. Tuesday all of the "big" machines will be rebooted, this will take some time, expect much of the day. H1IOPLSC has been glitching lately, could be caused by work around the machine but CDS will be looking into it. Restarting the models has solved the issue in the past, but still under investigation.

SEI

    EY HEPI locked up. EX HEPI is still operational and there will be some testing and filter maintenance. Been relieving HEPI biases, this will relieve harsh trips and hopefully have fewer trips.

TCS

    Seal on one of the TCS Y chiller pumps failed, spare is being hooked up. This was the same one that we have been having leaking issues with previously, could have been the issue (or part of). More TCS maintenance will happen during PSL upgrade.

Please take some time to go through the LVEA and put stuff away. It's nobody's stuff, which means it's everybody's stuff

I restarted the h1lsc0 models today.  Dave Barker is trending the timing information and state word and may have more to add.  But at this point we suspect it is likely a glitch in the IRIG-B as seen yesterday.

The system was not responsive via the network via ssh or EPICS CA.  The MEDM screen on the control room wall showed everything green, but trying to view the medm screen from another computer (a new connection) failed with the channels not connecting.

Going to the console showed that the repeated error 'nf_conntrack: table full, dropping packet'.  The system was set to track 64k connections.  I changed the limit (until reboot) to 100,000.  At that point new connections could be made and the medm screens went red with IPC.  I am suprised by this behavior, I would have though the IPC bit would have gone bad on the other machines irregardless of the state of the lsc machine.  At this point I killed all the models and restarted them.  Then TJ and I went through and cleared all the IPC errors through the site after verifying that they where related to h1lsc0.

Reviewing the dmesg output and filtering out nf_conntrack errors showed an ADC TIMEOUT on h1lscaux, h1omc, h1sqz, h1omcpi, h1lsc at 7246965.68s since boot.

Ran the checks for the STS & T240 masses (& will close FAMIS #6094).

STSs:  Fine & within range (same as last month). 

T240s: Now ETMy* HEPI is on its stops in prep for EY vent, and with that said, had the following masses out of range:

Averaging Mass Centering channels for 10 [sec] ...
2018-01-04 10:17:17.353721

There are 13 T240 proof masses out of range ( > 0.3 [V] )!
ETMX T240 1 DOF X/U = 0.42 [V]
ETMX T240 1 DOF Z/W = 0.396 [V]
ETMX T240 2 DOF X/U = -0.445 [V]
ETMX T240 2 DOF Y/V = -0.88 [V]
ETMX T240 3 DOF X/U = 0.318 [V]
ETMX T240 3 DOF Y/V = 0.435 [V]
ETMX T240 3 DOF Z/W = 0.327 [V]
* ETMY T240 3 DOF Z/W = 0.413 [V]
ITMX T240 1 DOF X/U = -0.412 [V]
ITMX T240 2 DOF Z/W = 0.33 [V]
ITMX T240 3 DOF X/U = -0.438 [V]
ITMY T240 3 DOF X/U = -0.648 [V]
ITMY T240 3 DOF Z/W = -1.08 [V]

PDF of pictures attached:

1. 45MHz driver as found
2. 9MHz cable label
3. new (original) 45MHz driver installed
4. 45MHz cable label

Cheryl, TVo, Keita, Jenne

Summary: The IMC is aligned and flashing.  The IMC REFL path on IOT2 is aligned.  The IMC trans path that comes from the transmission through IM1 is coming out of the viewport and light pipe, but not hitting the top periscope mirror by about 2 inches to the right as you're looking at the viewport from the IOT2 door (this is consistent with our having moved this beam farther from clipping on the edge of the viewport as noted in alog 39804). 

To do this:

• We basically followed Cheryl's plan of using the input PZT to align the leakage beam onto MC2 Trans, as a proxy for centering on MC2, while MC3 was misaligned so we weren't getting flashes.  To really see anything, we had to increase the whitening gain on MC2 Trans (H1:IMC-MC2_TRANS_WHITEN_GAIN) from its nominal of 36dB to the max of 45dB, and reset the dark offsets of each segment while the PSL shutter was closed.  We also increased the PSL power injected into the vacuum to ~4W. N.b. that the monitor PD for the amount of light injected seems to be not well aligned, so we just used whatever was in the rotation stage's calibration and requested 4W, but we didn't have an independent monitor of the actual power injected. 
• We then used MC2 to center the beam on the aperture of the baffle that is behind IM1, under the assumption that the baffle was well placed, so it's a proxy for getting the beam where we want on IM1.  Cheryl has a camera and TV set up on the floor for this purpose, as she described in alog 39955.
• MC1 and MC3 were tweaked a bit to maximize the flashes on MC2 Trans, but they didn't need much. 
• (Note to Cheryl: we touched the PZT and MC2 sliders again after you left, so what's in there now are our latest good values.  MC1 and MC3 didn't need any more touching)
• Once MC1 was set, we aligned the beam onto the MC REFL RFPD, IMC WFS A, IMC WFS B, and the IMC Refl camera. 

We're not yet really seeing any signal on H1:IMC-I_OUT, but the LSC computer seems to maybe be bad again, so I'll leave locking as an exercise for tomorrow.  No checking of analog electronics has been done tonight (by me, at least).

Still to do: We need to move the IMC Trans periscope on IOT2 a few inches toward the PSL enclosure, and will have to redo (move) that whole optical path to match.  Also being left as an exercise for the morning.  Until this is done, we won't have the nice trans camera to see the shapes of our flashes.  However, just looking on a card, we're mostly flashing 00, 01, and 10 modes, so everything should be pretty smooth going tomorrow.

GGrabeel, TVo

Topped off the chillers and started them back up this afternoon. They immediately faulted out, due to a set-point error. I set them to run in manual while I checked for leaks, there were no apparent leaks. TVo found the problem in EPICS where an integrator on a control loop was causing the set point to steadily increase (It was up to about 500,000 degrees Celsius I think). After turning off some inputs and filters we were able to get the more reasonable value of 21 degrees Celsius. The chillers will continue to run and be re-checked tomorrow.

J. Kissel, R. McCarthy, P. Fritschel 
FRS Ticket 5063
Prior LHO aLOGs 13556, 14357, and 21481

In perusing the list of closed FRS tickets after the Sep-Dec 2017 vent, Peter found that the above mentioned FRS ticket 5063, "H1 SRM osems (LF RT SD and T3) have excess noise" had been closed without supporting data. Richard clearly states in the most recent comment that the problem was a prominent screw head grounding against the chamber in-vacuo, but just didn't get the chance to post the data.

Attached is the supporting data. Where, in the past, SRM had shown prominent features and combs originating from large peaks around 1700 Hz and 1900 Hz, there are no such features visible in any of the OSEMs on SRM. For random comparison, I show SR3 top mass OSEMs as well.

J. Kissel

I've taken standard rubbing-check, top-mass to top-mass transfer functions for all suspensions in HAM2 and HAM3, now that we're down to about 1e-6 Torr (which is sufficient a vacuum that the suspension positions won't change further from buoyancy). Good news: All suspensions are free of rubbing after pumpdown, including MC1, MC2, MC3, IM1-4, PRM, PR2, and PR3.

Data files are listed below. Detailed results will be processed and posted in due time.
    /ligo/svncommon/SusSVN/sus/trunk/HSTS/H1/MC?/SAGM1/Data/2018-01-03*.xml
    /ligo/svncommon/SusSVN/sus/trunk/HSTS/H1/PR?/SAGM1/Data/2018-01-03*.xml

    /ligo/svncommon/SusSVN/sus/trunk/HLTS/H1/PR3/SAGM1/Data/2018-01-03*.xml

    /ligo/svncommon/SusSVN/sus/trunk/HAUX/H1/IM?/SAGM1/Data/2018-01-04*.xml

As a teaser / proof, I attach screenshots of each M1 Pitch to M1 Pitch transfer functions for the Triples.

Bubba and Bailey are in-process of sweeping the LVEA and transitioning to laser hazard, and opening the main PSL light pipe so we can work on IMC alignment.

We've known for a while that HEPI trips kick the suspensions prett badly. One of the things SamC found looking at earthquakes, is that during very large earthquakes, HEPI is often the first platform to trip. Hugh and I have used the post-vent time to minimize the differences between the free hanging HEPI positions and the target positions, by tweaking the springs. I used ETMY to test if this reduced the kick to the quad and it seems to be pretty good. The first plot shows the ETMY ISI T240s and the IPS cart locations during a trip before (blue traces on all plots) and after we reduced the offsets (red on all plots). Before offloading, the HEPI trip immediately tripped the ISI and kicked everything around quite a bit. After, the ISI actually stayed isolated until the T240s saturated, some 30+ seconds later, and even then the kick to the table wasn't that violent. The quad sees pretty much the same thing. Before, the suspension gets a pretty kick from the HEPI trip, but after the quad barely sees any motion at all.

This may not reflect what we see during an earthquake, but I don't see how this could make things worse. We'll need to monitor this for a little while because HEPI seems to be prone to drifting more that the ISIs, and we don't really know how much it drifts long term. 

As we prepare to align the IMC and IOT2, we may want to increase the laser power injected into the vacuum from the few hundred mW that we've been at for a few months up to a couple Watts.  There was some concern that we want to ensure that we're not going to harm anything in HAM6, since it is still at atmosphere and the trigger PD for the fast shutter is not currently plugged in.  There shouldn't be any problem however.  I have got the ITMs, PRM and SRM misaligned so that we're not getting any PRMI flashes and no beam is going to HAM6.  Please leave the ITMs, PRM and SRM misaligned. 

Even if the PRMI were to flash, nothing in HAM6 is aligned, so there should be no beam on any PDs or on the OMC.  Also, the PDs would be able to handle that much power, vacuum or atmo.  Given the gross misalignments, the likelihood of the OMC resonating is vanishingly small.

With the recycling mirrors misaligned but the ITMs aligned (so just transmission through optics, no resonant flashes) the max amount of power going to HAM6 is 3mW for every 1W of injected light (3% transmission through PRM, 25% for 2 BS passes, and 35% for the SRM).  We do not intend to go higher than 1W or 2W, which would put about 6mW at HAM6.  However, it is conceivable that the rotation stage could let up to ~50W into the vacuum, in which case we'd have 130mW of light at HAM6.  Not insignificant, but still should be fine. 

So, we are software ensuring that no beam is going to HAM6 while we use about 2W of PSL power, but even if some of the optics get re-aligned it'll all be fine.

R. McCarthy, M. Pirello

We replaced the spare (S1001082) Triple Top Coil Driver with the repaired original (S1100195).  The original had a bad relay and was swapped back in December with the spare.  The unit was repaired, tested, and replaced into its original configuration. 

Alog of events leading up to this: 39877

J. Kissel

The only other suspension in HAM2 / HAM3 that is rubbing is PR3. As with MC2, it doesn't look too serious, because the Qs are all nice and high. Probably another grazing EQ stop or two. 

Black 2017-07-25_1507 pre-vent clean reference
Red 2017-11-10_2044 current rubbing state

Betsy has been made aware, and will address when convenient.